diff --git a/TODO.md b/TODO.md
index 3aeda20..07cbb4c 100644
--- a/TODO.md
+++ b/TODO.md
@@ -19,19 +19,21 @@ Refactor ground rules:
 
 # Next Step
 
-Refactor step 1 (branch refactor/descriptive-constants): rename
-constants to descriptive, less C-like names. Creature/object/room/place
-flag bits (IsHuh→Confused, IsHalu→Hallucinating, CanHuh→CanConfuse,
-SeeMonst→SenseMonsters, ObjIsFound→WasFound, IsCanc→Cancelled, ...),
-trap types (TMyst→TrapMystery), item subtype constants
-(PLSD→PotionLSD, SIDRorS→ScrollIdentifyRingOrStick,
-RAddHit→RingDexterity, WsHasteM→WandHasteMonster,
-TwoSword→WeaponTwoHandedSword, ...), Max* count constants →
-Num*Types, and the Level.NTraps field → TrapCount. Pure rename; no
-behavior change; tests unchanged.
+Refactor step 2 (branch refactor/typed-kinds): typed kind enums —
+PotionKind, ScrollKind, RingKind, WandKind, WeaponKind, ArmorKind,
+TrapKind as iota enums with fmt.Stringer; Object.Which and the ObjInfo
+tables move to the typed kinds; the object category glyph bytes ('!',
+'?', ...) become an ObjectKind with a Glyph() method so item category
+and map character stop sharing one byte namespace.
 
 # Completed Steps
 
+- 2026-07-06 Refactor step 1 (refactor/descriptive-constants): renamed
+  all flag bits, trap types, item subtype constants, and Max* counts to
+  descriptive names (IsHuh→Confused, SeeMonst→SenseMonsters,
+  WsHasteM→WandHasteMonster, MaxSticks→NumWandTypes, ...);
+  Level.NTraps→TrapCount; C names kept as comment breadcrumbs. Pure
+  rename, suite green.
 - 2026-07-06 Made the rgoue branch Go-only: removed C sources and the
   autoconf/VS build system (they remain on master and modern-rogue),
   ported the last wizard command (item-probability listing), rewrote
@@ -53,58 +55,52 @@ behavior change; tests unchanged.
 
 # Future Steps
 
-1. Refactor step 2: typed kind enums — PotionKind, ScrollKind,
-   RingKind, WandKind, WeaponKind, ArmorKind, TrapKind as iota enums
-   with fmt.Stringer; Object.Which and the ObjInfo tables move to the
-   typed kinds; the object category glyph bytes ('!', '?', ...) become
-   an ObjectKind with a Glyph() method so item category and map
-   character stop sharing one byte namespace.
-2. Refactor step 3: un-overload Object fields — split Object.Arm into
+1. Refactor step 3: un-overload Object fields — split Object.Arm into
    ArmorClass/Charges/GoldValue; parse damage dice ("1x4/1x2") once
    into a DiceSpec type at table definition instead of per swing;
    save-format update with round-trip test migration.
-3. Adopt the house Go linting standards: copy .golangci.yml from the
+2. Adopt the house Go linting standards: copy .golangci.yml from the
    prompts repo and bring game/, term/, and cmd/ lint-clean (the port
    is greenfield code, so no exemptions apply).
-4. Refactor step 4: method renames, movement/world subsystem
+3. Refactor step 4: method renames, movement/world subsystem
    (doMove→moveHero, beTrapped→springTrap, rndmove→randomStep,
    doRooms/doPassages/doMaze→digRooms/digPassages/digMaze,
    chgStr→changeStrength, ...); remove the goto/label flows in doMove,
    dispatch, and saveGame in favor of loops and helpers.
-5. Refactor step 5: method renames, items/combat/UI subsystems
+4. Refactor step 5: method renames, items/combat/UI subsystems
    (invName→inventoryName, rollEm→rollAttacks, doPot→applyPotionFuse,
    getItem→promptPackItem returning (obj, ok), getDir→promptDirection);
    int status codes (attack returning -1) become named results. Two or
    three commits, one subsystem each.
-6. Refactor step 6: extract types from the god object — MessageLine
+5. Refactor step 6: extract types from the god object — MessageLine
    owns the msg/addmsg/endmsg machinery; pack/inventory operations move
    onto *Player; monster/object list management and map queries
    consolidate onto *Level; RogueGame keeps turn orchestration and
    cross-system effects only.
-7. Refactor step 7: effects dispatch — the giant quaff/readScroll/doZap
+6. Refactor step 7: effects dispatch — the giant quaff/readScroll/doZap
    switches become per-kind handler tables of small named methods,
    keeping effect order and RNG call sequence identical.
-8. Refactor step 8: constructor and style pass per the house
+7. Refactor step 8: constructor and style pass per the house
    styleguide — game.New(game.Params{...}) replacing NewGame(Config);
    replace the gameEnd panic unwind with error-based turn results where
    feasible; 77-column wrap sweep.
-9. Docs refresh: update ARCHITECTURE.md Part 2 and README.md for the
+8. Docs refresh: update ARCHITECTURE.md Part 2 and README.md for the
    post-refactor names; add the C name → Go name rename table.
-10. Playtest hardening pass: play several full games with the tcell
+9. Playtest hardening pass: play several full games with the tcell
     binary and extend run_test.go to script a deeper multi-level
     playthrough (descend past level 5, use potions, scrolls, zapping,
     save/restore). Fix any panics, message mismatches, or divergences
     from the C behavior that this uncovers, with regression tests.
-11. Verify the seed-compatibility claim against the C reference on
+10. Verify the seed-compatibility claim against the C reference on
     c-master: same seed, same dungeon, same item tables, for several
     seeds.
-12. Broaden unit test coverage where playtesting finds thin spots
+11. Broaden unit test coverage where playtesting finds thin spots
     (rings, sticks, wizard commands).
-13. Tag a release once a full game (Amulet retrieval and score entry)
+12. Tag a release once a full game (Amulet retrieval and score entry)
     completes without defects.
-14. Full-terminal-size support (deferred by explicit decision
+13. Full-terminal-size support (deferred by explicit decision
     2026-07-06): per-game dungeon dimensions instead of the 80x24
     constants; open design questions are resize policy, gameplay
     tuning at larger sizes, and a --classic 80x24 mode.
-15. Note: this repo is exempt from the standard policy scaffold. Do not
+14. Note: this repo is exempt from the standard policy scaffold. Do not
     add Makefile, Dockerfile, or REPO_POLICIES.md.
diff --git a/game/armor.go b/game/armor.go
index b8d4d26..e17373d 100644
--- a/game/armor.go
+++ b/game/armor.go
@@ -23,7 +23,7 @@ func (g *RogueGame) wear() {
 		return
 	}
 	g.wasteTime()
-	obj.Flags.Set(IsKnow)
+	obj.Flags.Set(Known)
 	sp := g.invName(obj, true)
 	p.CurArmor = obj
 	if !g.Options.Terse {
diff --git a/game/chase.go b/game/chase.go
index 222624d..37b158f 100644
--- a/game/chase.go
+++ b/game/chase.go
@@ -9,19 +9,19 @@ const dragonShot = 5
 func (g *RogueGame) runners(int) {
 	list := append([]*Monster(nil), g.Level.Monsters...)
 	for _, tp := range list {
-		if !tp.On(IsHeld) && tp.On(IsRun) {
+		if !tp.On(Held) && tp.On(Awake) {
 			origPos := tp.Pos
-			wastarget := tp.On(IsTarget)
+			wastarget := tp.On(Targeted)
 			if g.moveMonst(tp) == -1 {
 				continue
 			}
-			if tp.On(IsFly) && distCp(g.Player.Pos, tp.Pos) >= 3 {
+			if tp.On(Flying) && distCp(g.Player.Pos, tp.Pos) >= 3 {
 				if g.moveMonst(tp) == -1 {
 					continue
 				}
 			}
 			if wastarget && origPos != tp.Pos {
-				tp.Flags.Clear(IsTarget)
+				tp.Flags.Clear(Targeted)
 				g.ToDeath = false
 			}
 		}
@@ -35,12 +35,12 @@ func (g *RogueGame) runners(int) {
 // moveMonst executes a single turn of running for a monster (chase.c
 // move_monst). Returns -1 if the monster died or left the level.
 func (g *RogueGame) moveMonst(tp *Monster) int {
-	if !tp.On(IsSlow) || tp.Turn {
+	if !tp.On(Slowed) || tp.Turn {
 		if g.doChase(tp) == -1 {
 			return -1
 		}
 	}
-	if tp.On(IsHaste) {
+	if tp.On(Hasted) {
 		if g.doChase(tp) == -1 {
 			return -1
 		}
@@ -68,7 +68,7 @@ func (g *RogueGame) relocate(th *Monster, newLoc Coord) {
 	g.move(newLoc.Y, newLoc.X)
 	if g.seeMonst(th) {
 		g.addch(th.Disguise)
-	} else if g.Player.On(SeeMonst) {
+	} else if g.Player.On(SenseMonsters) {
 		g.standout()
 		g.addch(th.Type)
 		g.standend()
@@ -83,7 +83,7 @@ func (g *RogueGame) doChase(th *Monster) int {
 	mindist := 32767
 
 	rer := th.Room // find room of chaser
-	if th.On(IsGreed) && rer.GoldVal == 0 {
+	if th.On(Greedy) && rer.GoldVal == 0 {
 		th.Dest = &p.Pos // if gold has been taken, run after hero
 	}
 	var ree *Room // find room of chasee
@@ -108,7 +108,7 @@ over:
 			}
 		}
 		if door {
-			rer = &g.Level.Passages[*g.Level.FlagsAt(th.Pos.Y, th.Pos.X)&FPNum]
+			rer = &g.Level.Passages[*g.Level.FlagsAt(th.Pos.Y, th.Pos.X)&FPassNum]
 			door = false
 			goto over
 		}
@@ -120,7 +120,7 @@ over:
 		if th.Type == 'D' && (th.Pos.Y == p.Pos.Y || th.Pos.X == p.Pos.X ||
 			abs(th.Pos.Y-p.Pos.Y) == abs(th.Pos.X-p.Pos.X)) &&
 			distCp(th.Pos, p.Pos) <= BoltLength*BoltLength &&
-			!th.On(IsCanc) && g.rnd(dragonShot) == 0 {
+			!th.On(Cancelled) && g.rnd(dragonShot) == 0 {
 			g.Delta.Y = sign(p.Pos.Y - th.Pos.Y)
 			g.Delta.X = sign(p.Pos.X - th.Pos.X)
 			if g.HasHit {
@@ -130,7 +130,7 @@ over:
 			g.Running = false
 			g.Count = 0
 			g.Quiet = 0
-			if g.ToDeath && !th.On(IsTarget) {
+			if g.ToDeath && !th.On(Targeted) {
 				g.ToDeath = false
 				g.Kamikaze = false
 			}
@@ -147,7 +147,7 @@ over:
 				if th.Dest == &obj.Pos {
 					detachObj(&g.Level.Objects, obj)
 					attachObj(&th.Pack, obj)
-					if th.Room.Flags.Has(IsGone) {
+					if th.Room.Flags.Has(Gone) {
 						g.Level.SetChar(obj.Pos.Y, obj.Pos.X, Passage)
 					} else {
 						g.Level.SetChar(obj.Pos.Y, obj.Pos.X, Floor)
@@ -168,7 +168,7 @@ over:
 	g.relocate(th, g.chRet)
 	// And stop running if need be
 	if stoprun && th.Pos == *th.Dest {
-		th.Flags.Clear(IsRun)
+		th.Flags.Clear(Awake)
 	}
 	return 0
 }
@@ -185,14 +185,14 @@ func (g *RogueGame) chase(tp *Monster, ee Coord) bool {
 	// If the thing is confused, let it move randomly. Invisible Stalkers
 	// are slightly confused all of the time, and bats are quite confused
 	// all the time
-	if (tp.On(IsHuh) && g.rnd(5) != 0) || (tp.Type == 'P' && g.rnd(5) == 0) ||
+	if (tp.On(Confused) && g.rnd(5) != 0) || (tp.Type == 'P' && g.rnd(5) == 0) ||
 		(tp.Type == 'B' && g.rnd(2) == 0) {
 		// get a valid random move
 		g.chRet = g.rndmove(&tp.Creature)
 		curdist = distCp(g.chRet, ee)
 		// Small chance that it will become un-confused
 		if g.rnd(20) == 0 {
-			tp.Flags.Clear(IsHuh)
+			tp.Flags.Clear(Confused)
 		}
 	} else {
 		// Otherwise, find the empty spot next to the chaser that is
@@ -233,7 +233,7 @@ func (g *RogueGame) chase(tp *Monster, ee Coord) bool {
 								break
 							}
 						}
-						if found != nil && found.Which == SScare {
+						if found != nil && found.Which == ScrollScareMonster {
 							continue
 						}
 					}
@@ -268,8 +268,8 @@ func (g *RogueGame) setOldch(tp *Monster, cp Coord) {
 	}
 	sch := tp.OldCh
 	tp.OldCh = g.mvinch(cp.Y, cp.X)
-	if !g.Player.On(IsBlind) {
-		if (sch == Floor || tp.OldCh == Floor) && tp.Room.Flags.Has(IsDark) {
+	if !g.Player.On(Blind) {
+		if (sch == Floor || tp.OldCh == Floor) && tp.Room.Flags.Has(Dark) {
 			tp.OldCh = ' '
 		} else if distCp(cp, g.Player.Pos) <= LampDist && g.Options.SeeFloor {
 			tp.OldCh = g.Level.Char(cp.Y, cp.X)
@@ -281,10 +281,10 @@ func (g *RogueGame) setOldch(tp *Monster, cp Coord) {
 // see_monst).
 func (g *RogueGame) seeMonst(mp *Monster) bool {
 	p := &g.Player
-	if p.On(IsBlind) {
+	if p.On(Blind) {
 		return false
 	}
-	if mp.On(IsInvis) && !p.On(CanSee) {
+	if mp.On(Invisible) && !p.On(CanSeeInvisible) {
 		return false
 	}
 	y, x := mp.Pos.Y, mp.Pos.X
@@ -298,7 +298,7 @@ func (g *RogueGame) seeMonst(mp *Monster) bool {
 	if mp.Room != p.Room {
 		return false
 	}
-	return !mp.Room.Flags.Has(IsDark)
+	return !mp.Room.Flags.Has(Dark)
 }
 
 // runto sets a monster running after the hero (chase.c runto).
@@ -308,8 +308,8 @@ func (g *RogueGame) runto(runner Coord) {
 		return
 	}
 	// Start the beastie running
-	tp.Flags.Set(IsRun)
-	tp.Flags.Clear(IsHeld)
+	tp.Flags.Set(Awake)
+	tp.Flags.Clear(Held)
 	tp.Dest = g.findDest(tp)
 }
 
@@ -317,8 +317,8 @@ func (g *RogueGame) runto(runner Coord) {
 // any room (chase.c roomin).
 func (g *RogueGame) roomin(cp Coord) *Room {
 	fp := *g.Level.FlagsAt(cp.Y, cp.X)
-	if fp.Has(FPass) {
-		return &g.Level.Passages[fp&FPNum]
+	if fp.Has(FPassage) {
+		return &g.Level.Passages[fp&FPassNum]
 	}
 
 	for i := range g.Level.Rooms {
@@ -348,11 +348,11 @@ func (g *RogueGame) diagOk(sp, ep Coord) bool {
 // cansee).
 func (g *RogueGame) cansee(y, x int) bool {
 	p := &g.Player
-	if p.On(IsBlind) {
+	if p.On(Blind) {
 		return false
 	}
 	if distance(y, x, p.Pos.Y, p.Pos.X) < LampDist {
-		if g.Level.FlagsAt(y, x).Has(FPass) {
+		if g.Level.FlagsAt(y, x).Has(FPassage) {
 			if y != p.Pos.Y && x != p.Pos.X &&
 				!stepOk(g.Level.Char(y, p.Pos.X)) &&
 				!stepOk(g.Level.Char(p.Pos.Y, x)) {
@@ -364,7 +364,7 @@ func (g *RogueGame) cansee(y, x int) bool {
 	// We can only see if the hero is in the same room as the coordinate
 	// and the room is lit, or if it is close.
 	rer := g.roomin(Coord{X: x, Y: y})
-	return rer == p.Room && !rer.Flags.Has(IsDark)
+	return rer == p.Room && !rer.Flags.Has(Dark)
 }
 
 // findDest finds the proper destination for the monster (chase.c
@@ -375,7 +375,7 @@ func (g *RogueGame) findDest(tp *Monster) *Coord {
 		return &g.Player.Pos
 	}
 	for _, obj := range g.Level.Objects {
-		if obj.Type == Scroll && obj.Which == SScare {
+		if obj.Type == Scroll && obj.Which == ScrollScareMonster {
 			continue
 		}
 		if g.roomin(obj.Pos) == tp.Room && g.rnd(100) < prob {
diff --git a/game/command.go b/game/command.go
index e68b2a1..298b3e9 100644
--- a/game/command.go
+++ b/game/command.go
@@ -7,7 +7,7 @@ package game
 func (g *RogueGame) command() {
 	p := &g.Player
 	ntimes := 1 // number of player moves
-	if p.On(IsHaste) {
+	if p.On(Hasted) {
 		ntimes++
 	}
 	// Let the daemons start up
@@ -21,7 +21,7 @@ func (g *RogueGame) command() {
 		}
 		// these are illegal things for the player to be, so if any are
 		// set, someone's been poking in memory
-		if p.On(IsSlow | IsGreed | IsInvis | IsRegen | IsTarget) {
+		if p.On(Slowed | Greedy | Invisible | Regenerates | Targeted) {
 			panic("player flags corrupted")
 		}
 
@@ -59,7 +59,7 @@ func (g *RogueGame) command() {
 		}
 		if g.NoCommand != 0 {
 			if g.NoCommand--; g.NoCommand == 0 {
-				p.Flags.Set(IsRun)
+				p.Flags.Set(Awake)
 				g.msg("you can move again")
 			}
 		} else {
@@ -121,14 +121,14 @@ func (g *RogueGame) command() {
 	}
 	g.DoDaemons(After)
 	g.DoFuses(After)
-	if p.IsRing(Left, RSearch) {
+	if p.IsRing(Left, RingSearching) {
 		g.search()
-	} else if p.IsRing(Left, RTeleport) && g.rnd(50) == 0 {
+	} else if p.IsRing(Left, RingTeleportation) && g.rnd(50) == 0 {
 		g.teleport()
 	}
-	if p.IsRing(Right, RSearch) {
+	if p.IsRing(Right, RingSearching) {
 		g.search()
-	} else if p.IsRing(Right, RTeleport) && g.rnd(50) == 0 {
+	} else if p.IsRing(Right, RingTeleportation) && g.rnd(50) == 0 {
 		g.teleport()
 	}
 }
@@ -197,7 +197,7 @@ over:
 		g.doRun('n')
 	case CTRL('H'), CTRL('J'), CTRL('K'), CTRL('L'),
 		CTRL('Y'), CTRL('U'), CTRL('B'), CTRL('N'):
-		if !p.On(IsBlind) {
+		if !p.On(Blind) {
 			g.DoorStop = true
 			g.Firstmove = true
 		}
@@ -219,7 +219,7 @@ over:
 		g.Delta.Y += p.Pos.Y
 		g.Delta.X += p.Pos.X
 		mp := g.Level.MonsterAt(g.Delta.Y, g.Delta.X)
-		if mp == nil || (!g.seeMonst(mp) && !p.On(SeeMonst)) {
+		if mp == nil || (!g.seeMonst(mp) && !p.On(SenseMonsters)) {
 			if !g.Options.Terse {
 				g.addmsg("I see ")
 			}
@@ -228,7 +228,7 @@ over:
 		} else if g.diagOk(p.Pos, g.Delta) {
 			g.ToDeath = true
 			g.MaxHit = 0
-			mp.Flags.Set(IsTarget)
+			mp.Flags.Set(Targeted)
 			g.RunCh = g.DirCh
 			ch = g.DirCh
 			goto over
@@ -333,10 +333,10 @@ over:
 			}
 			if g.Level.Char(g.Delta.Y, g.Delta.X) != Trap {
 				g.msg("no trap there")
-			} else if p.On(IsHalu) {
-				g.msg("%s", trName[g.rnd(NTraps)])
+			} else if p.On(Hallucinating) {
+				g.msg("%s", trName[g.rnd(NumTrapTypes)])
 			} else {
-				g.msg("%s", trName[*fp&FTMask])
+				g.msg("%s", trName[*fp&FTrapMask])
 				fp.Set(FSeen)
 			}
 		}
@@ -407,7 +407,7 @@ func (g *RogueGame) wizardCommand(ch byte) {
 	case CTRL('C'):
 		g.addPass()
 	case CTRL('X'):
-		g.turnSee(p.On(SeeMonst))
+		g.turnSee(p.On(SenseMonsters))
 	case CTRL('~'):
 		if item := g.getItem("charge", int(Stick)); item != nil {
 			item.SetCharges(10000)
@@ -418,7 +418,7 @@ func (g *RogueGame) wizardCommand(ch byte) {
 		}
 		// Give him a sword (+1,+1)
 		obj := newObject()
-		g.initWeapon(obj, TwoSword)
+		g.initWeapon(obj, WeaponTwoHandedSword)
 		obj.HPlus = 1
 		obj.DPlus = 1
 		g.addPack(obj, true)
@@ -426,9 +426,9 @@ func (g *RogueGame) wizardCommand(ch byte) {
 		// And his suit of armor
 		obj = newObject()
 		obj.Type = Armor
-		obj.Which = PlateMail
+		obj.Which = ArmorPlateMail
 		obj.Arm = -5
-		obj.Flags.Set(IsKnow)
+		obj.Flags.Set(Known)
 		obj.Count = 1
 		p.CurArmor = obj
 		g.addPack(obj, true)
@@ -453,10 +453,10 @@ func (g *RogueGame) search() {
 	ey := p.Pos.Y + 1
 	ex := p.Pos.X + 1
 	probinc := 0
-	if p.On(IsHalu) {
+	if p.On(Hallucinating) {
 		probinc = 3
 	}
-	if p.On(IsBlind) {
+	if p.On(Blind) {
 		probinc += 2
 	}
 	found := false
@@ -486,10 +486,10 @@ func (g *RogueGame) search() {
 				if !g.Options.Terse {
 					g.addmsg("you found ")
 				}
-				if p.On(IsHalu) {
-					g.msg("%s", trName[g.rnd(NTraps)])
+				if p.On(Hallucinating) {
+					g.msg("%s", trName[g.rnd(NumTrapTypes)])
 				} else {
-					g.msg("%s", trName[*fp&FTMask])
+					g.msg("%s", trName[*fp&FTrapMask])
 					fp.Set(FSeen)
 				}
 				foundone = true
@@ -661,7 +661,7 @@ func (g *RogueGame) uLevel() {
 // levitCheck checks whether she's levitating, and if she is, prints an
 // appropriate message (command.c levit_check).
 func (g *RogueGame) levitCheck() bool {
-	if !g.Player.On(IsLevit) {
+	if !g.Player.On(Levitating) {
 		return false
 	}
 	g.msg("You can't.  You're floating off the ground!")
diff --git a/game/daemons.go b/game/daemons.go
index 842b68a..10f3086 100644
--- a/game/daemons.go
+++ b/game/daemons.go
@@ -53,10 +53,10 @@ func (g *RogueGame) doctor(int) {
 	} else if g.Quiet >= 3 {
 		p.Stats.HP += g.rnd(lv-7) + 1
 	}
-	if p.IsRing(Left, RRegen) {
+	if p.IsRing(Left, RingRegeneration) {
 		p.Stats.HP++
 	}
-	if p.IsRing(Right, RRegen) {
+	if p.IsRing(Right, RingRegeneration) {
 		p.Stats.HP++
 	}
 	if ohp != p.Stats.HP {
@@ -92,27 +92,27 @@ func wanderTime(g *RogueGame) int { return g.spread(70) }
 // unconfuse releases the poor player from his confusion (daemons.c
 // unconfuse).
 func (g *RogueGame) unconfuse(int) {
-	g.Player.Flags.Clear(IsHuh)
+	g.Player.Flags.Clear(Confused)
 	g.msg("you feel less %s now", g.chooseStr("trippy", "confused"))
 }
 
 // unsee turns off the ability to see invisible (daemons.c unsee).
 func (g *RogueGame) unsee(int) {
 	for _, th := range g.Level.Monsters {
-		if th.On(IsInvis) && g.seeMonst(th) {
+		if th.On(Invisible) && g.seeMonst(th) {
 			g.mvaddch(th.Pos.Y, th.Pos.X, th.OldCh)
 		}
 	}
-	g.Player.Flags.Clear(CanSee)
+	g.Player.Flags.Clear(CanSeeInvisible)
 }
 
 // sight gives the hero his sight back (daemons.c sight).
 func (g *RogueGame) sight(int) {
 	p := &g.Player
-	if p.On(IsBlind) {
+	if p.On(Blind) {
 		g.Extinguish(DSight)
-		p.Flags.Clear(IsBlind)
-		if !p.Room.Flags.Has(IsGone) {
+		p.Flags.Clear(Blind)
+		if !p.Room.Flags.Has(Gone) {
 			g.enterRoom(p.Pos)
 		}
 		g.msg("%s", g.chooseStr("far out!  Everything is all cosmic again",
@@ -122,7 +122,7 @@ func (g *RogueGame) sight(int) {
 
 // nohaste ends the hasting (daemons.c nohaste).
 func (g *RogueGame) nohaste(int) {
-	g.Player.Flags.Clear(IsHaste)
+	g.Player.Flags.Clear(Hasted)
 	g.msg("you feel yourself slowing down")
 }
 
@@ -170,7 +170,7 @@ func (g *RogueGame) stomach(int) {
 		}
 	}
 	if p.HungryState != origHungry {
-		p.Flags.Clear(IsRun)
+		p.Flags.Clear(Awake)
 		g.Running = false
 		g.ToDeath = false
 		g.Count = 0
@@ -180,14 +180,14 @@ func (g *RogueGame) stomach(int) {
 // comeDown takes the hero down off her acid trip (daemons.c come_down).
 func (g *RogueGame) comeDown(int) {
 	p := &g.Player
-	if !p.On(IsHalu) {
+	if !p.On(Hallucinating) {
 		return
 	}
 
 	g.KillDaemon(DVisuals)
-	p.Flags.Clear(IsHalu)
+	p.Flags.Clear(Hallucinating)
 
-	if p.On(IsBlind) {
+	if p.On(Blind) {
 		return
 	}
 
@@ -199,11 +199,11 @@ func (g *RogueGame) comeDown(int) {
 	}
 
 	// undo the monsters
-	seemonst := p.On(SeeMonst)
+	seemonst := p.On(SenseMonsters)
 	for _, tp := range g.Level.Monsters {
 		g.move(tp.Pos.Y, tp.Pos.X)
 		if g.cansee(tp.Pos.Y, tp.Pos.X) {
-			if !tp.On(IsInvis) || p.On(CanSee) {
+			if !tp.On(Invisible) || p.On(CanSeeInvisible) {
 				g.addch(tp.Disguise)
 			} else {
 				g.addch(g.Level.Char(tp.Pos.Y, tp.Pos.X))
@@ -237,7 +237,7 @@ func (g *RogueGame) visuals(int) {
 	}
 
 	// change the monsters
-	seemonst := p.On(SeeMonst)
+	seemonst := p.On(SenseMonsters)
 	for _, tp := range g.Level.Monsters {
 		g.move(tp.Pos.Y, tp.Pos.X)
 		if g.seeMonst(tp) {
@@ -256,7 +256,7 @@ func (g *RogueGame) visuals(int) {
 
 // land lands the hero from a levitation potion (daemons.c land).
 func (g *RogueGame) land(int) {
-	g.Player.Flags.Clear(IsLevit)
+	g.Player.Flags.Clear(Levitating)
 	g.msg("%s", g.chooseStr("bummer!  You've hit the ground",
 		"you float gently to the ground"))
 }
diff --git a/game/effects_test.go b/game/effects_test.go
index 32bca00..9dd0e3e 100644
--- a/game/effects_test.go
+++ b/game/effects_test.go
@@ -23,7 +23,7 @@ func TestQuaffHealingPotion(t *testing.T) {
 	g := mkGameInput(t, 5, "")
 	pot := newObject()
 	pot.Type = Potion
-	pot.Which = PHealing
+	pot.Which = PotionHealing
 	ch := give(g, pot)
 	g.scr.term.(*testTerm).input = []byte{ch}
 
@@ -32,7 +32,7 @@ func TestQuaffHealingPotion(t *testing.T) {
 	if g.Player.Stats.HP <= 1 {
 		t.Error("healing potion did not heal")
 	}
-	if !g.Items.Potions[PHealing].Know {
+	if !g.Items.Potions[PotionHealing].Know {
 		t.Error("healing potion not identified after drinking")
 	}
 	if len(g.Player.Pack) != 5 {
@@ -44,12 +44,12 @@ func TestQuaffConfusionSetsFlagAndFuse(t *testing.T) {
 	g := mkGameInput(t, 5, "")
 	pot := newObject()
 	pot.Type = Potion
-	pot.Which = PConfuse
+	pot.Which = PotionConfusion
 	ch := give(g, pot)
 	g.scr.term.(*testTerm).input = []byte{ch}
 
 	g.quaff()
-	if !g.Player.On(IsHuh) {
+	if !g.Player.On(Confused) {
 		t.Error("confusion potion did not confuse")
 	}
 	if g.findSlot(DUnconfuse) == nil {
@@ -59,7 +59,7 @@ func TestQuaffConfusionSetsFlagAndFuse(t *testing.T) {
 	for range 30 {
 		g.DoFuses(After)
 	}
-	if g.Player.On(IsHuh) {
+	if g.Player.On(Confused) {
 		t.Error("confusion never wore off")
 	}
 }
@@ -68,7 +68,7 @@ func TestReadEnchantArmor(t *testing.T) {
 	g := mkGameInput(t, 5, "")
 	scr := newObject()
 	scr.Type = Scroll
-	scr.Which = SArmor
+	scr.Which = ScrollEnchantArmor
 	ch := give(g, scr)
 	g.scr.term.(*testTerm).input = []byte{ch}
 
@@ -88,16 +88,16 @@ func TestReadHoldMonsterFreezesAdjacent(t *testing.T) {
 	// TestHoldScrollGreedyMonsterQuirk.
 	g := mkGameInput(t, 5, "")
 	tp := spawnAdjacent(g, 'Z')
-	tp.Flags.Set(IsRun)
+	tp.Flags.Set(Awake)
 	scr := newObject()
 	scr.Type = Scroll
-	scr.Which = SHold
+	scr.Which = ScrollHoldMonster
 	ch := give(g, scr)
 	g.scr.term.(*testTerm).input = []byte{ch}
 
 	g.readScroll()
 	t.Logf("after scroll: flags=%o huh=%q", tp.Flags, g.Msgs.Huh)
-	if tp.On(IsRun) || !tp.On(IsHeld) {
+	if tp.On(Awake) || !tp.On(Held) {
 		t.Error("hold monster scroll did not hold the adjacent monster")
 	}
 }
@@ -109,20 +109,20 @@ func TestReadHoldMonsterFreezesAdjacent(t *testing.T) {
 func TestHoldScrollGreedyMonsterQuirk(t *testing.T) {
 	g := mkGameInput(t, 5, "")
 	tp := spawnAdjacent(g, 'O')
-	tp.Flags.Set(IsRun)
+	tp.Flags.Set(Awake)
 	scr := newObject()
 	scr.Type = Scroll
-	scr.Which = SHold
+	scr.Which = ScrollHoldMonster
 	ch := give(g, scr)
 	g.scr.term.(*testTerm).input = []byte{ch}
 
 	g.readScroll()
-	t.Logf("orc after scroll: flags=%o (IsRun=%v IsHeld=%v)",
-		tp.Flags, tp.On(IsRun), tp.On(IsHeld))
-	if !tp.On(IsHeld) {
-		t.Error("orc lost IsHeld entirely")
+	t.Logf("orc after scroll: flags=%o (Awake=%v Held=%v)",
+		tp.Flags, tp.On(Awake), tp.On(Held))
+	if !tp.On(Held) {
+		t.Error("orc lost Held entirely")
 	}
-	if !tp.On(IsRun) {
+	if !tp.On(Awake) {
 		t.Error("quirk changed: greedy monster stayed held; if this is a " +
 			"deliberate fix, update this test and ARCHITECTURE.md")
 	}
@@ -133,7 +133,7 @@ func TestZapSlowMonster(t *testing.T) {
 	tp := spawnAdjacent(g, 'Z')
 	stick := newObject()
 	stick.Type = Stick
-	stick.Which = WsSlowM
+	stick.Which = WandSlowMonster
 	g.fixStick(stick)
 	ch := give(g, stick)
 	g.scr.term.(*testTerm).input = []byte{ch}
@@ -141,7 +141,7 @@ func TestZapSlowMonster(t *testing.T) {
 
 	charges := stick.Charges()
 	g.doZap()
-	if !tp.On(IsSlow) {
+	if !tp.On(Slowed) {
 		t.Error("slow monster wand did not slow")
 	}
 	if stick.Charges() != charges-1 {
diff --git a/game/fight.go b/game/fight.go
index f6359c3..bbf2704 100644
--- a/game/fight.go
+++ b/game/fight.go
@@ -48,14 +48,14 @@ var addDam = [32]int{
 // setMname returns the monster name for the given monster (fight.c
 // set_mname).
 func (g *RogueGame) setMname(tp *Monster) string {
-	if !g.seeMonst(tp) && !g.Player.On(SeeMonst) {
+	if !g.seeMonst(tp) && !g.Player.On(SenseMonsters) {
 		if g.Options.Terse {
 			return "it"
 		}
 		return "something"
 	}
 	var mname string
-	if g.Player.On(IsHalu) {
+	if g.Player.On(Hallucinating) {
 		ch := int(g.mvinch(tp.Pos.Y, tp.Pos.X))
 		if !isUpper(byte(ch)) {
 			ch = g.rnd(26)
@@ -83,9 +83,9 @@ func (g *RogueGame) fight(mp Coord, weap *Object, thrown bool) bool {
 	g.Quiet = 0
 	g.runto(mp)
 	// Let him know it was really a xeroc (if it was one).
-	if tp.Type == 'X' && tp.Disguise != 'X' && !p.On(IsBlind) {
+	if tp.Type == 'X' && tp.Disguise != 'X' && !p.On(Blind) {
 		tp.Disguise = 'X'
-		if p.On(IsHalu) {
+		if p.On(Hallucinating) {
 			g.mvaddch(tp.Pos.Y, tp.Pos.X, byte(g.rnd(26)+'A'))
 		}
 		g.msg("%s", g.chooseStr("heavy!  That's a nasty critter!",
@@ -104,17 +104,17 @@ func (g *RogueGame) fight(mp Coord, weap *Object, thrown bool) bool {
 		} else {
 			g.hit("", mname, g.Options.Terse)
 		}
-		if p.On(CanHuh) {
+		if p.On(CanConfuse) {
 			didHit = true
-			tp.Flags.Set(IsHuh)
-			p.Flags.Clear(CanHuh)
+			tp.Flags.Set(Confused)
+			p.Flags.Clear(CanConfuse)
 			g.endmsg()
 			g.HasHit = false
 			g.msg("your hands stop glowing %s", g.pickColor("red"))
 		}
 		if tp.Stats.HP <= 0 {
 			g.killed(tp, true)
-		} else if didHit && !p.On(IsBlind) {
+		} else if didHit && !p.On(Blind) {
 			g.msg("%s appears confused", mname)
 		}
 		didHit = true
@@ -137,13 +137,13 @@ func (g *RogueGame) attack(mp *Monster) int {
 	g.Running = false
 	g.Count = 0
 	g.Quiet = 0
-	if g.ToDeath && !mp.On(IsTarget) {
+	if g.ToDeath && !mp.On(Targeted) {
 		g.ToDeath = false
 		g.Kamikaze = false
 	}
-	if mp.Type == 'X' && mp.Disguise != 'X' && !p.On(IsBlind) {
+	if mp.Type == 'X' && mp.Disguise != 'X' && !p.On(Blind) {
 		mp.Disguise = 'X'
-		if p.On(IsHalu) {
+		if p.On(Hallucinating) {
 			g.mvaddch(mp.Pos.Y, mp.Pos.X, byte(g.rnd(26)+'A'))
 		}
 	}
@@ -171,14 +171,14 @@ func (g *RogueGame) attack(mp *Monster) int {
 				g.ToDeath = false
 			}
 		}
-		if !mp.On(IsCanc) {
+		if !mp.On(Cancelled) {
 			switch mp.Type {
 			case 'A':
 				// If an aquator hits, you can lose armor class.
 				g.rustArmor(p.CurArmor)
 			case 'I':
 				// The ice monster freezes you
-				p.Flags.Clear(IsRun)
+				p.Flags.Clear(Awake)
 				if g.NoCommand == 0 {
 					g.addmsg("you are frozen")
 					if !g.Options.Terse {
@@ -193,7 +193,7 @@ func (g *RogueGame) attack(mp *Monster) int {
 			case 'R':
 				// Rattlesnakes have poisonous bites
 				if !g.save(VsPoison) {
-					if !p.IsWearing(RSustStr) {
+					if !p.IsWearing(RingSustainStrength) {
 						g.chgStr(-1)
 						if !g.Options.Terse {
 							g.msg("you feel a bite in your leg and now feel weaker")
@@ -243,7 +243,7 @@ func (g *RogueGame) attack(mp *Monster) int {
 				}
 			case 'F':
 				// Venus Flytrap stops the poor guy from moving
-				p.Flags.Set(IsHeld)
+				p.Flags.Set(Held)
 				p.VfHit++
 				g.Monsters['F'-'A'].Stats.Dmg = fmt.Sprintf("%dx1", p.VfHit)
 				if p.Stats.HP--; p.Stats.HP <= 0 {
@@ -330,20 +330,20 @@ func (g *RogueGame) rollEm(thatt, thdef *Creature, weap *Object, hurl bool) bool
 		hplus = weap.HPlus
 		dplus = weap.DPlus
 		if weap == p.CurWeapon {
-			if p.IsRing(Left, RAddDam) {
+			if p.IsRing(Left, RingIncreaseDamage) {
 				dplus += p.CurRing[Left].Arm
-			} else if p.IsRing(Left, RAddHit) {
+			} else if p.IsRing(Left, RingDexterity) {
 				hplus += p.CurRing[Left].Arm
 			}
-			if p.IsRing(Right, RAddDam) {
+			if p.IsRing(Right, RingIncreaseDamage) {
 				dplus += p.CurRing[Right].Arm
-			} else if p.IsRing(Right, RAddHit) {
+			} else if p.IsRing(Right, RingDexterity) {
 				hplus += p.CurRing[Right].Arm
 			}
 		}
 		cp = weap.Damage
 		if hurl {
-			if weap.Flags.Has(IsMissl) && p.CurWeapon != nil &&
+			if weap.Flags.Has(Missile) && p.CurWeapon != nil &&
 				p.CurWeapon.Which == weap.Launch {
 				cp = weap.HurlDmg
 				hplus += p.CurWeapon.HPlus
@@ -355,7 +355,7 @@ func (g *RogueGame) rollEm(thatt, thdef *Creature, weap *Object, hurl bool) bool
 	}
 	// If the creature being attacked is not running (asleep or held) then
 	// the attacker gets a plus four bonus to hit.
-	if !thdef.Flags.Has(IsRun) {
+	if !thdef.Flags.Has(Awake) {
 		hplus += 4
 	}
 	defArm := def.Arm
@@ -363,10 +363,10 @@ func (g *RogueGame) rollEm(thatt, thdef *Creature, weap *Object, hurl bool) bool
 		if p.CurArmor != nil {
 			defArm = p.CurArmor.Arm
 		}
-		if p.IsRing(Left, RProtect) {
+		if p.IsRing(Left, RingProtection) {
 			defArm -= p.CurRing[Left].Arm
 		}
-		if p.IsRing(Right, RProtect) {
+		if p.IsRing(Right, RingProtection) {
 			defArm -= p.CurRing[Right].Arm
 		}
 	}
@@ -512,7 +512,7 @@ func (g *RogueGame) removeMon(mp Coord, tp *Monster, waskill bool) {
 	g.Level.SetMonsterAt(mp.Y, mp.X, nil)
 	g.mvaddch(mp.Y, mp.X, tp.OldCh)
 	detachMon(&g.Level.Monsters, tp)
-	if tp.On(IsTarget) {
+	if tp.On(Targeted) {
 		g.Kamikaze = false
 		g.ToDeath = false
 		if g.Options.FightFlush {
@@ -529,7 +529,7 @@ func (g *RogueGame) killed(tp *Monster, pr bool) {
 	// If the monster was a venus flytrap, un-hold him
 	switch tp.Type {
 	case 'F':
-		p.Flags.Clear(IsHeld)
+		p.Flags.Clear(Held)
 		p.VfHit = 0
 		g.Monsters['F'-'A'].Stats.Dmg = "000x0"
 	case 'L':
diff --git a/game/fight_test.go b/game/fight_test.go
index c700e81..4d10e80 100644
--- a/game/fight_test.go
+++ b/game/fight_test.go
@@ -25,7 +25,7 @@ func TestRollEmParsesMultiAttackDice(t *testing.T) {
 	g := mkGame(t, 42)
 	att := &Creature{Stats: Stats{Str: 16, Lvl: 20, Dmg: "1x4/1x4/1x4"}}
 	def := &Creature{Stats: Stats{Arm: 10, HP: 1000}}
-	def.Flags.Set(IsRun)
+	def.Flags.Set(Awake)
 	// With attacker level 20 vs armor 10, swing always hits
 	// (rnd(20)+wplus >= (20-20)-10 is always true), so three attacks of
 	// 1x4 + str bonus 1 each must deal between 6 and 15 damage.
@@ -60,7 +60,7 @@ func TestAttackHurtsPlayer(t *testing.T) {
 	g := mkGame(t, 9)
 	tp := spawnAdjacent(g, 'T') // troll: 1x8/1x8/2x6
 	tp.Stats.Lvl = 20           // always hits
-	tp.Flags.Clear(IsCanc)
+	tp.Flags.Clear(Cancelled)
 	hpBefore := g.Player.Stats.HP
 	g.Player.Stats.HP = 500
 	g.Player.Stats.MaxHP = 500
@@ -96,7 +96,7 @@ func TestRunnersChaseHero(t *testing.T) {
 	}
 	tp := &Monster{}
 	g.newMonster(tp, 'H', pos)
-	tp.Flags.Set(IsRun)
+	tp.Flags.Set(Awake)
 	tp.Dest = &p.Pos
 	d0 := distCp(tp.Pos, p.Pos)
 	g.runners(0)
diff --git a/game/game.go b/game/game.go
index fbe416e..1aef5cd 100644
--- a/game/game.go
+++ b/game/game.go
@@ -3,19 +3,19 @@ package game
 // ItemLore is the per-game item identity state: the randomized appearance
 // names and the seven mutable ObjInfo tables (extern.c/init.c).
 type ItemLore struct {
-	PotColors  [MaxPotions]string // p_colors: colors of the potions
-	ScrNames   [MaxScrolls]string // s_names: names of the scrolls
-	RingStones [MaxRings]string   // r_stones: stone settings of the rings
-	WandMade   [MaxSticks]string  // ws_made: what sticks are made of
-	WandType   [MaxSticks]string  // ws_type: "wand" or "staff"
+	PotColors  [NumPotionTypes]string // p_colors: colors of the potions
+	ScrNames   [NumScrollTypes]string // s_names: names of the scrolls
+	RingStones [NumRingTypes]string   // r_stones: stone settings of the rings
+	WandMade   [NumWandTypes]string   // ws_made: what sticks are made of
+	WandType   [NumWandTypes]string   // ws_type: "wand" or "staff"
 
 	Things  [NumThings]ObjInfo
-	Potions [MaxPotions]ObjInfo
-	Scrolls [MaxScrolls]ObjInfo
-	Rings   [MaxRings]ObjInfo
-	Sticks  [MaxSticks]ObjInfo
-	Weapons [MaxWeapons + 1]ObjInfo
-	Armors  [MaxArmors]ObjInfo
+	Potions [NumPotionTypes]ObjInfo
+	Scrolls [NumScrollTypes]ObjInfo
+	Rings   [NumRingTypes]ObjInfo
+	Sticks  [NumWandTypes]ObjInfo
+	Weapons [NumWeaponTypes + 1]ObjInfo
+	Armors  [NumArmorTypes]ObjInfo
 
 	Group int // group number for the next stack of missiles (weapons.c `group`)
 }
@@ -168,7 +168,7 @@ func NewGame(cfg Config) *RogueGame {
 	g.FileName = cfg.Home + "/rogue.save"
 	g.rogueOpts = cfg.RogueOpts
 	if cfg.Wizard {
-		g.Player.Flags.Set(SeeMonst)
+		g.Player.Flags.Set(SenseMonsters)
 	}
 	if cfg.RogueOpts != "" {
 		g.ParseOpts(cfg.RogueOpts)
@@ -177,7 +177,7 @@ func NewGame(cfg Config) *RogueGame {
 	g.Monsters = monsterTable
 	g.Items.Group = 2 // weapons.c: int group = 2
 	for i := range g.Level.Passages {
-		g.Level.Passages[i].Flags = IsGone | IsDark
+		g.Level.Passages[i].Flags = Gone | Dark
 	}
 
 	g.initProbs()     // set up prob tables for objects
diff --git a/game/init.go b/game/init.go
index e4d7b0c..9ada940 100644
--- a/game/init.go
+++ b/game/init.go
@@ -19,31 +19,31 @@ func (g *RogueGame) initPlayer() {
 	// And his suit of armor
 	obj = newObject()
 	obj.Type = Armor
-	obj.Which = RingMail
-	obj.Arm = aClass[RingMail] - 1
-	obj.Flags.Set(IsKnow)
+	obj.Which = ArmorRingMail
+	obj.Arm = aClass[ArmorRingMail] - 1
+	obj.Flags.Set(Known)
 	obj.Count = 1
 	p.CurArmor = obj
 	g.addPack(obj, true)
 	// Give him his weaponry.  First a mace.
 	obj = newObject()
-	g.initWeapon(obj, Mace)
+	g.initWeapon(obj, WeaponMace)
 	obj.HPlus = 1
 	obj.DPlus = 1
-	obj.Flags.Set(IsKnow)
+	obj.Flags.Set(Known)
 	g.addPack(obj, true)
 	p.CurWeapon = obj
 	// Now a +1 bow
 	obj = newObject()
-	g.initWeapon(obj, Bow)
+	g.initWeapon(obj, WeaponBow)
 	obj.HPlus = 1
-	obj.Flags.Set(IsKnow)
+	obj.Flags.Set(Known)
 	g.addPack(obj, true)
 	// Now some arrows
 	obj = newObject()
-	g.initWeapon(obj, Arrow)
+	g.initWeapon(obj, WeaponArrow)
 	obj.Count = g.rnd(15) + 25
-	obj.Flags.Set(IsKnow)
+	obj.Flags.Set(Known)
 	g.addPack(obj, true)
 }
 
@@ -51,7 +51,7 @@ func (g *RogueGame) initPlayer() {
 // (init.c init_colors).
 func (g *RogueGame) initColors() {
 	used := make([]bool, len(rainbow))
-	for i := 0; i < MaxPotions; i++ {
+	for i := 0; i < NumPotionTypes; i++ {
 		var j int
 		for {
 			j = g.rnd(len(rainbow))
@@ -66,7 +66,7 @@ func (g *RogueGame) initColors() {
 
 // initNames generates the names of the various scrolls (init.c init_names).
 func (g *RogueGame) initNames() {
-	for i := 0; i < MaxScrolls; i++ {
+	for i := 0; i < NumScrollTypes; i++ {
 		var cp strings.Builder
 		nwords := g.rnd(3) + 2
 		for ; nwords > 0; nwords-- {
@@ -88,7 +88,7 @@ func (g *RogueGame) initNames() {
 // (init.c init_stones).
 func (g *RogueGame) initStones() {
 	used := make([]bool, len(stoneTable))
-	for i := 0; i < MaxRings; i++ {
+	for i := 0; i < NumRingTypes; i++ {
 		var j int
 		for {
 			j = g.rnd(len(stoneTable))
@@ -107,7 +107,7 @@ func (g *RogueGame) initStones() {
 func (g *RogueGame) initMaterials() {
 	used := make([]bool, len(woods))
 	metused := make([]bool, len(metals))
-	for i := 0; i < MaxSticks; i++ {
+	for i := 0; i < NumWandTypes; i++ {
 		var str string
 		for {
 			if g.rnd(2) == 0 {
@@ -156,14 +156,14 @@ func (g *RogueGame) initProbs() {
 	sumProbs(g.Items.Scrolls[:])
 	sumProbs(g.Items.Rings[:])
 	sumProbs(g.Items.Sticks[:])
-	sumProbs(g.Items.Weapons[:MaxWeapons]) // C sums MAXWEAPONS, excluding the flame entry
+	sumProbs(g.Items.Weapons[:NumWeaponTypes]) // C sums MAXWEAPONS, excluding the flame entry
 	sumProbs(g.Items.Armors[:])
 }
 
 // pickColor returns the given color, or a random one if the hero is
 // hallucinating (init.c pick_color).
 func (g *RogueGame) pickColor(col string) string {
-	if g.Player.On(IsHalu) {
+	if g.Player.On(Hallucinating) {
 		return rainbow[g.rnd(len(rainbow))]
 	}
 	return col
diff --git a/game/level.go b/game/level.go
index 6c846ab..07c3ccc 100644
--- a/game/level.go
+++ b/game/level.go
@@ -10,13 +10,13 @@ type Place struct {
 // Level is the current dungeon level: the map and everything on it. It is
 // reset in place by NewLevel, matching the C reuse of the global arrays.
 type Level struct {
-	Places   [MaxLines * MaxCols]Place
-	Rooms    [MaxRooms]Room
-	Passages [MaxPass]Room // one pseudo-room per passage network
-	Objects  []*Object     // lvl_obj: objects on this level
-	Monsters []*Monster    // mlist: monsters on the level
-	Stairs   Coord         // location of the staircase
-	NTraps   int           // number of traps on this level
+	Places    [MaxLines * MaxCols]Place
+	Rooms     [MaxRooms]Room
+	Passages  [MaxPass]Room // one pseudo-room per passage network
+	Objects   []*Object     // lvl_obj: objects on this level
+	Monsters  []*Monster    // mlist: monsters on the level
+	Stairs    Coord         // location of the staircase
+	TrapCount int           // number of traps on this level
 }
 
 // At returns the map cell at (y, x); the C INDEX(y,x) macro, including its
diff --git a/game/misc.go b/game/misc.go
index 2cd4355..eb135dd 100644
--- a/game/misc.go
+++ b/game/misc.go
@@ -36,7 +36,7 @@ func (g *RogueGame) look(wakeup bool) {
 			if x < 0 || x >= NumCols {
 				continue
 			}
-			if !p.On(IsBlind) {
+			if !p.On(Blind) {
 				if y == hero.Y && x == hero.X {
 					continue
 				}
@@ -49,11 +49,11 @@ func (g *RogueGame) look(wakeup bool) {
 			}
 			fp := &pp.Flags
 			if pch != Door && ch != Door {
-				if (pfl & FPass) != (*fp & FPass) {
+				if (pfl & FPassage) != (*fp & FPassage) {
 					continue
 				}
 			}
-			if (fp.Has(FPass) || ch == Door) && (pfl.Has(FPass) || pch == Door) {
+			if (fp.Has(FPassage) || ch == Door) && (pfl.Has(FPassage) || pch == Door) {
 				if hero.X != x && hero.Y != y &&
 					!stepOk(g.Level.Char(y, hero.X)) && !stepOk(g.Level.Char(hero.Y, x)) {
 					continue
@@ -63,7 +63,7 @@ func (g *RogueGame) look(wakeup bool) {
 			tp := pp.Monst
 			if tp == nil {
 				ch = g.tripCh(y, x, ch)
-			} else if p.On(SeeMonst) && tp.On(IsInvis) {
+			} else if p.On(SenseMonsters) && tp.On(Invisible) {
 				if g.DoorStop && !g.Firstmove {
 					g.Running = false
 				}
@@ -73,20 +73,20 @@ func (g *RogueGame) look(wakeup bool) {
 					g.wakeMonster(y, x)
 				}
 				if g.seeMonst(tp) {
-					if p.On(IsHalu) {
+					if p.On(Hallucinating) {
 						ch = byte(g.rnd(26) + 'A')
 					} else {
 						ch = tp.Disguise
 					}
 				}
 			}
-			if p.On(IsBlind) && (y != hero.Y || x != hero.X) {
+			if p.On(Blind) && (y != hero.Y || x != hero.X) {
 				continue
 			}
 
 			g.move(y, x)
 
-			if p.Room.Flags.Has(IsDark) && !g.Options.SeeFloor && ch == Floor {
+			if p.Room.Flags.Has(Dark) && !g.Options.SeeFloor && ch == Floor {
 				ch = ' '
 			}
 
@@ -156,7 +156,7 @@ func (g *RogueGame) look(wakeup bool) {
 // tripCh returns the character for this space, taking into account whether
 // or not the player is tripping (misc.c trip_ch).
 func (g *RogueGame) tripCh(y, x int, ch byte) byte {
-	if g.Player.On(IsHalu) && g.After {
+	if g.Player.On(Hallucinating) && g.After {
 		switch ch {
 		case Floor, ' ', Passage, '-', '|', Door, Trap:
 		default:
@@ -171,8 +171,8 @@ func (g *RogueGame) tripCh(y, x int, ch byte) byte {
 // eraseLamp erases the area shown by a lamp in a dark room
 // (misc.c erase_lamp).
 func (g *RogueGame) eraseLamp(pos Coord, rp *Room) {
-	if !(g.Options.SeeFloor && rp.Flags&(IsGone|IsDark) == IsDark &&
-		!g.Player.On(IsBlind)) {
+	if !(g.Options.SeeFloor && rp.Flags&(Gone|Dark) == Dark &&
+		!g.Player.On(Blind)) {
 		return
 	}
 
@@ -195,7 +195,7 @@ func (g *RogueGame) eraseLamp(pos Coord, rp *Room) {
 // showFloor reports whether we show the floor in her room at this time
 // (misc.c show_floor).
 func (g *RogueGame) showFloor() bool {
-	if g.Player.Room.Flags&(IsGone|IsDark) == IsDark && !g.Player.On(IsBlind) {
+	if g.Player.Room.Flags&(Gone|Dark) == Dark && !g.Player.On(Blind) {
 		return g.Options.SeeFloor
 	}
 	return true
@@ -278,10 +278,10 @@ func (g *RogueGame) chgStr(amt int) {
 	p := &g.Player
 	addStr(&p.Stats.Str, amt)
 	comp := p.Stats.Str
-	if p.IsRing(Left, RAddStr) {
+	if p.IsRing(Left, RingAddStrength) {
 		addStr(&comp, -p.CurRing[Left].Arm)
 	}
-	if p.IsRing(Right, RAddStr) {
+	if p.IsRing(Right, RingAddStrength) {
 		addStr(&comp, -p.CurRing[Right].Arm)
 	}
 	if comp > p.MaxStats.Str {
@@ -301,14 +301,14 @@ func addStr(sp *int, amt int) {
 // addHaste adds a haste to the player (misc.c add_haste).
 func (g *RogueGame) addHaste(potion bool) bool {
 	p := &g.Player
-	if p.On(IsHaste) {
+	if p.On(Hasted) {
 		g.NoCommand += g.rnd(8)
-		p.Flags.Clear(IsRun | IsHaste)
+		p.Flags.Clear(Awake | Hasted)
 		g.Extinguish(DNohaste)
 		g.msg("you faint from exhaustion")
 		return false
 	}
-	p.Flags.Set(IsHaste)
+	p.Flags.Set(Hasted)
 	if potion {
 		g.Fuse(DNohaste, 0, g.rnd(4)+4, After)
 	}
@@ -403,7 +403,7 @@ func (g *RogueGame) getDir() bool {
 		g.LastDir = g.DirCh
 		g.lastDelt = g.Delta
 	}
-	if g.Player.On(IsHuh) && g.rnd(5) == 0 {
+	if g.Player.On(Confused) && g.rnd(5) == 0 {
 		for {
 			g.Delta.Y = g.rnd(3) - 1
 			g.Delta.X = g.rnd(3) - 1
@@ -451,7 +451,7 @@ func (g *RogueGame) rndThing() byte {
 // chooseStr picks the first or second string depending on whether the
 // player is tripping (misc.c choose_str).
 func (g *RogueGame) chooseStr(ts, ns string) string {
-	if g.Player.On(IsHalu) {
+	if g.Player.On(Hallucinating) {
 		return ts
 	}
 	return ns
diff --git a/game/monsters.go b/game/monsters.go
index 7c1a915..b80e15b 100644
--- a/game/monsters.go
+++ b/game/monsters.go
@@ -60,11 +60,11 @@ func (g *RogueGame) newMonster(tp *Monster, typ byte, cp Coord) {
 	tp.Stats.Exp = mp.Stats.Exp + levAdd*10 + expAdd(tp)
 	tp.Flags = mp.Flags
 	if g.Depth > 29 {
-		tp.Flags.Set(IsHaste)
+		tp.Flags.Set(Hasted)
 	}
 	tp.Turn = true
 	tp.Pack = nil
-	if g.Player.IsWearing(RAggr) {
+	if g.Player.IsWearing(RingAggravateMonsters) {
 		g.runto(cp)
 	}
 	if typ == 'X' {
@@ -101,9 +101,9 @@ func (g *RogueGame) wanderer() {
 		}
 	}
 	g.newMonster(tp, g.randMonster(true), cp)
-	if g.Player.On(SeeMonst) {
+	if g.Player.On(SenseMonsters) {
 		g.standout()
-		if !g.Player.On(IsHalu) {
+		if !g.Player.On(Hallucinating) {
 			g.addch(tp.Type)
 		} else {
 			g.addch(byte(g.rnd(26) + 'A'))
@@ -123,24 +123,24 @@ func (g *RogueGame) wakeMonster(y, x int) *Monster {
 	}
 	ch := tp.Type
 	// Every time he sees a mean monster, it might start chasing him
-	if !tp.On(IsRun) && g.rnd(3) != 0 && tp.On(IsMean) && !tp.On(IsHeld) &&
-		!p.IsWearing(RStealth) && !p.On(IsLevit) {
+	if !tp.On(Awake) && g.rnd(3) != 0 && tp.On(Mean) && !tp.On(Held) &&
+		!p.IsWearing(RingStealth) && !p.On(Levitating) {
 		tp.Dest = &p.Pos
-		tp.Flags.Set(IsRun)
+		tp.Flags.Set(Awake)
 	}
-	if ch == 'M' && !p.On(IsBlind) && !p.On(IsHalu) &&
-		!tp.On(IsFound) && !tp.On(IsCanc) && tp.On(IsRun) {
+	if ch == 'M' && !p.On(Blind) && !p.On(Hallucinating) &&
+		!tp.On(Found) && !tp.On(Cancelled) && tp.On(Awake) {
 		rp := p.Room
-		if (rp != nil && !rp.Flags.Has(IsDark)) ||
+		if (rp != nil && !rp.Flags.Has(Dark)) ||
 			distance(y, x, p.Pos.Y, p.Pos.X) < LampDist {
-			tp.Flags.Set(IsFound)
+			tp.Flags.Set(Found)
 			if !g.save(VsMagic) {
-				if p.On(IsHuh) {
+				if p.On(Confused) {
 					g.Lengthen(DUnconfuse, g.spread(HuhDuration))
 				} else {
 					g.Fuse(DUnconfuse, 0, g.spread(HuhDuration), After)
 				}
-				p.Flags.Set(IsHuh)
+				p.Flags.Set(Confused)
 				mname := g.setMname(tp)
 				g.addmsg("%s", mname)
 				if mname != "it" {
@@ -151,8 +151,8 @@ func (g *RogueGame) wakeMonster(y, x int) *Monster {
 		}
 	}
 	// Let greedy ones guard gold
-	if tp.On(IsGreed) && !tp.On(IsRun) {
-		tp.Flags.Set(IsRun)
+	if tp.On(Greedy) && !tp.On(Awake) {
+		tp.Flags.Set(Awake)
 		if p.Room.GoldVal != 0 {
 			tp.Dest = &p.Room.Gold
 		} else {
@@ -182,10 +182,10 @@ func (g *RogueGame) saveThrow(which int, st *Stats) bool {
 func (g *RogueGame) save(which int) bool {
 	p := &g.Player
 	if which == VsMagic {
-		if p.IsRing(Left, RProtect) {
+		if p.IsRing(Left, RingProtection) {
 			which -= p.CurRing[Left].Arm
 		}
-		if p.IsRing(Right, RProtect) {
+		if p.IsRing(Right, RingProtection) {
 			which -= p.CurRing[Right].Arm
 		}
 	}
diff --git a/game/move.go b/game/move.go
index 6535305..0dd328e 100644
--- a/game/move.go
+++ b/game/move.go
@@ -21,7 +21,7 @@ func (g *RogueGame) doMove(dy, dx int) {
 	}
 	// Do a confused move (maybe)
 	var nh Coord
-	if p.On(IsHuh) && g.rnd(5) != 0 {
+	if p.On(Confused) && g.rnd(5) != 0 {
 		nh = g.rndmove(&p.Creature)
 		if nh == p.Pos {
 			g.After = false
@@ -52,12 +52,12 @@ over:
 		fl = *g.Level.FlagsAt(nh.Y, nh.X)
 		ch = g.Level.VisibleChar(nh.Y, nh.X)
 		if !fl.Has(FReal) && ch == Floor {
-			if !p.On(IsLevit) {
+			if !p.On(Levitating) {
 				ch = Trap
 				g.Level.SetChar(nh.Y, nh.X, Trap)
 				g.Level.FlagsAt(nh.Y, nh.X).Set(FReal)
 			}
-		} else if p.On(IsHeld) && ch != 'F' {
+		} else if p.On(Held) && ch != 'F' {
 			g.msg("you are being held")
 			return
 		}
@@ -67,8 +67,8 @@ over:
 	}
 	switch ch {
 	case ' ', '|', '-':
-		if g.Options.PassGo && g.Running && p.Room.Flags.Has(IsGone) &&
-			!p.On(IsBlind) {
+		if g.Options.PassGo && g.Running && p.Room.Flags.Has(Gone) &&
+			!p.On(Blind) {
 			var b1, b2 bool
 			switch g.RunCh {
 			case 'h', 'l':
@@ -109,13 +109,13 @@ over:
 		g.After = false
 	case Door:
 		g.Running = false
-		if g.Level.FlagsAt(p.Pos.Y, p.Pos.X).Has(FPass) {
+		if g.Level.FlagsAt(p.Pos.Y, p.Pos.X).Has(FPassage) {
 			g.enterRoom(nh)
 		}
 		g.moveStuff(nh, fl)
 	case Trap:
 		tr := g.beTrapped(nh)
-		if tr == TDoor || tr == TTelep {
+		if tr == TrapDoor || tr == TrapTeleport {
 			return
 		}
 		g.moveStuff(nh, fl)
@@ -151,7 +151,7 @@ over:
 func (g *RogueGame) moveStuff(nh Coord, fl PlaceFlags) {
 	p := &g.Player
 	g.mvaddch(p.Pos.Y, p.Pos.X, g.floorAt())
-	if fl.Has(FPass) && g.Level.Char(g.Oldpos.Y, g.Oldpos.X) == Door {
+	if fl.Has(FPassage) && g.Level.Char(g.Oldpos.Y, g.Oldpos.X) == Door {
 		g.leaveRoom(nh)
 	}
 	p.Pos = nh
@@ -161,7 +161,7 @@ func (g *RogueGame) moveStuff(nh Coord, fl PlaceFlags) {
 // (move.c turn_ok).
 func (g *RogueGame) turnOk(y, x int) bool {
 	pp := g.Level.At(y, x)
-	return pp.Ch == Door || pp.Flags&(FReal|FPass) == (FReal|FPass)
+	return pp.Ch == Door || pp.Flags&(FReal|FPassage) == (FReal|FPassage)
 }
 
 // turnref decides whether to refresh at a passage turning (move.c turnref).
@@ -179,7 +179,7 @@ func (g *RogueGame) turnref() {
 // doorOpen is called to wake up things in a room that might move when the
 // hero enters (move.c door_open).
 func (g *RogueGame) doorOpen(rp *Room) {
-	if rp.Flags.Has(IsGone) {
+	if rp.Flags.Has(Gone) {
 		return
 	}
 	for y := rp.Pos.Y; y < rp.Pos.Y+rp.Max.Y; y++ {
@@ -194,24 +194,24 @@ func (g *RogueGame) doorOpen(rp *Room) {
 // beTrapped makes him pay for stepping on a trap (move.c be_trapped).
 func (g *RogueGame) beTrapped(tc Coord) int {
 	p := &g.Player
-	if p.On(IsLevit) {
-		return TRust // anything that's not a door or teleport
+	if p.On(Levitating) {
+		return TrapRust // anything that's not a door or teleport
 	}
 	g.Running = false
 	g.Count = 0
 	pp := g.Level.At(tc.Y, tc.X)
 	pp.Ch = Trap
-	tr := int(pp.Flags & FTMask)
+	tr := int(pp.Flags & FTrapMask)
 	pp.Flags.Set(FSeen)
 	switch tr {
-	case TDoor:
+	case TrapDoor:
 		g.Depth++
 		g.NewLevel()
 		g.msg("you fell into a trap!")
-	case TBear:
+	case TrapBear:
 		g.NoMove += g.spread(3) // BEARTIME
 		g.msg("you are caught in a bear trap")
-	case TMyst:
+	case TrapMystery:
 		switch g.rnd(11) {
 		case 0:
 			g.msg("you are suddenly in a parallel dimension")
@@ -236,11 +236,11 @@ func (g *RogueGame) beTrapped(tc Coord) int {
 		case 10:
 			g.msg("you pack turns %s!", rainbow[g.rnd(len(rainbow))])
 		}
-	case TSleep:
+	case TrapSleep:
 		g.NoCommand += g.spread(5) // SLEEPTIME
-		p.Flags.Clear(IsRun)
+		p.Flags.Clear(Awake)
 		g.msg("a strange white mist envelops you and you fall asleep")
-	case TArrow:
+	case TrapArrow:
 		if g.swing(p.Stats.Lvl-1, p.Stats.Arm, 1) {
 			p.Stats.HP -= g.roll(1, 6)
 			if p.Stats.HP <= 0 {
@@ -251,18 +251,18 @@ func (g *RogueGame) beTrapped(tc Coord) int {
 			}
 		} else {
 			arrow := newObject()
-			g.initWeapon(arrow, Arrow)
+			g.initWeapon(arrow, WeaponArrow)
 			arrow.Count = 1
 			arrow.Pos = p.Pos
 			g.fall(arrow, false)
 			g.msg("an arrow shoots past you")
 		}
-	case TTelep:
+	case TrapTeleport:
 		// since the hero's leaving, look() won't put a TRAP down for us,
 		// so we have to do it ourself
 		g.teleport()
 		g.mvaddch(tc.Y, tc.X, Trap)
-	case TDart:
+	case TrapDart:
 		if !g.swing(p.Stats.Lvl+1, p.Stats.Arm, 1) {
 			g.msg("a small dart whizzes by your ear and vanishes")
 		} else {
@@ -271,12 +271,12 @@ func (g *RogueGame) beTrapped(tc Coord) int {
 				g.msg("a poisoned dart killed you")
 				g.death('d')
 			}
-			if !p.IsWearing(RSustStr) && !g.save(VsPoison) {
+			if !p.IsWearing(RingSustainStrength) && !g.save(VsPoison) {
 				g.chgStr(-1)
 			}
 			g.msg("a small dart just hit you in the shoulder")
 		}
-	case TRust:
+	case TrapRust:
 		g.msg("a gush of water hits you on the head")
 		g.rustArmor(p.CurArmor)
 	}
@@ -311,7 +311,7 @@ func (g *RogueGame) rndmove(who *Creature) Coord {
 				break
 			}
 		}
-		if found != nil && found.Which == SScare {
+		if found != nil && found.Which == ScrollScareMonster {
 			return who.Pos
 		}
 	}
@@ -321,12 +321,12 @@ func (g *RogueGame) rndmove(who *Creature) Coord {
 // rustArmor rusts the given armor, if it is a legal kind to rust, and we
 // aren't wearing a magic ring (move.c rust_armor).
 func (g *RogueGame) rustArmor(arm *Object) {
-	if arm == nil || arm.Type != Armor || arm.Which == Leather ||
+	if arm == nil || arm.Type != Armor || arm.Which == ArmorLeather ||
 		arm.Arm >= 9 {
 		return
 	}
 
-	if arm.Flags.Has(IsProt) || g.Player.IsWearing(RSustArm) {
+	if arm.Flags.Has(Protected) || g.Player.IsWearing(RingMaintainArmor) {
 		if !g.ToDeath {
 			g.msg("the rust vanishes instantly")
 		}
diff --git a/game/newlevel.go b/game/newlevel.go
index 062f300..1ee51b4 100644
--- a/game/newlevel.go
+++ b/game/newlevel.go
@@ -12,7 +12,7 @@ const (
 // NewLevel digs and draws a new level (new_level.c new_level).
 func (g *RogueGame) NewLevel() {
 	p := &g.Player
-	p.Flags.Clear(IsHeld) // unhold when you go down just in case
+	p.Flags.Clear(Held) // unhold when you go down just in case
 	if g.Depth > g.MaxDepth {
 		g.MaxDepth = g.Depth
 	}
@@ -31,11 +31,11 @@ func (g *RogueGame) NewLevel() {
 	g.putThings() // Place objects (if any)
 	// Place the traps
 	if g.rnd(10) < g.Depth {
-		g.Level.NTraps = g.rnd(g.Depth/4) + 1
-		if g.Level.NTraps > MaxTraps {
-			g.Level.NTraps = MaxTraps
+		g.Level.TrapCount = g.rnd(g.Depth/4) + 1
+		if g.Level.TrapCount > MaxTraps {
+			g.Level.TrapCount = MaxTraps
 		}
-		for i := g.Level.NTraps; i > 0; i-- {
+		for i := g.Level.TrapCount; i > 0; i-- {
 			// not only wouldn't it be NICE to have traps in mazes (not
 			// that we care about being nice), since the trap number is
 			// stored where the passage number is, we can't actually do it.
@@ -48,7 +48,7 @@ func (g *RogueGame) NewLevel() {
 			}
 			sp := g.Level.FlagsAt(stairs.Y, stairs.X)
 			sp.Clear(FReal)
-			*sp |= PlaceFlags(g.rnd(NTraps))
+			*sp |= PlaceFlags(g.rnd(NumTrapTypes))
 		}
 	}
 	// Place the staircase down.
@@ -65,10 +65,10 @@ func (g *RogueGame) NewLevel() {
 	p.Pos = hero
 	g.enterRoom(hero)
 	g.mvaddch(hero.Y, hero.X, PlayerCh)
-	if p.On(SeeMonst) {
+	if p.On(SenseMonsters) {
 		g.turnSee(false)
 	}
-	if p.On(IsHalu) {
+	if p.On(Hallucinating) {
 		g.visuals(0)
 	}
 }
@@ -77,7 +77,7 @@ func (g *RogueGame) NewLevel() {
 func (g *RogueGame) rndRoom() int {
 	for {
 		rm := g.rnd(MaxRooms)
-		if !g.Level.Rooms[rm].Flags.Has(IsGone) {
+		if !g.Level.Rooms[rm].Flags.Has(Gone) {
 			return rm
 		}
 	}
@@ -151,7 +151,7 @@ func (g *RogueGame) treasRoom() {
 		if mp, ok := g.findFloorIn(rp, maxTries, true); ok {
 			tp := &Monster{}
 			g.newMonster(tp, g.randMonster(false), mp)
-			tp.Flags.Set(IsMean) // no sloughers in THIS room
+			tp.Flags.Set(Mean) // no sloughers in THIS room
 			g.givePack(tp)
 		}
 	}
diff --git a/game/newlevel_test.go b/game/newlevel_test.go
index da0c962..350dccb 100644
--- a/game/newlevel_test.go
+++ b/game/newlevel_test.go
@@ -86,10 +86,10 @@ func TestNewLevelInvariants(t *testing.T) {
 			t.Errorf("seed %d: starting pack has %d items, want 5",
 				seed, len(g.Player.Pack))
 		}
-		if g.Player.CurWeapon == nil || g.Player.CurWeapon.Which != Mace {
+		if g.Player.CurWeapon == nil || g.Player.CurWeapon.Which != WeaponMace {
 			t.Errorf("seed %d: not wielding the starting mace", seed)
 		}
-		if g.Player.CurArmor == nil || g.Player.CurArmor.Which != RingMail {
+		if g.Player.CurArmor == nil || g.Player.CurArmor.Which != ArmorRingMail {
 			t.Errorf("seed %d: not wearing the starting ring mail", seed)
 		}
 	}
diff --git a/game/pack.go b/game/pack.go
index 552ef1c..a4846b9 100644
--- a/game/pack.go
+++ b/game/pack.go
@@ -15,10 +15,10 @@ func (g *RogueGame) addPack(obj *Object, silent bool) {
 	}
 
 	// Check for and deal with scare monster scrolls
-	if obj.Type == Scroll && obj.Which == SScare && obj.Flags.Has(ObjIsFound) {
+	if obj.Type == Scroll && obj.Which == ScrollScareMonster && obj.Flags.Has(WasFound) {
 		detachObj(&g.Level.Objects, obj)
 		g.mvaddch(p.Pos.Y, p.Pos.X, g.floorCh())
-		if p.Room.Flags.Has(IsGone) {
+		if p.Room.Flags.Has(Gone) {
 			g.Level.SetChar(p.Pos.Y, p.Pos.X, Passage)
 		} else {
 			g.Level.SetChar(p.Pos.Y, p.Pos.X, Floor)
@@ -101,7 +101,7 @@ func (g *RogueGame) addPack(obj *Object, silent bool) {
 		}
 	}
 
-	obj.Flags.Set(ObjIsFound)
+	obj.Flags.Set(WasFound)
 
 	// If this was the object of something's desire, that monster will get
 	// mad and run at the hero.
@@ -146,7 +146,7 @@ func (g *RogueGame) packRoom(fromFloor bool, obj *Object) bool {
 	if fromFloor {
 		detachObj(&g.Level.Objects, obj)
 		g.mvaddch(p.Pos.Y, p.Pos.X, g.floorCh())
-		if p.Room.Flags.Has(IsGone) {
+		if p.Room.Flags.Has(Gone) {
 			g.Level.SetChar(p.Pos.Y, p.Pos.X, Passage)
 		} else {
 			g.Level.SetChar(p.Pos.Y, p.Pos.X, Floor)
@@ -234,7 +234,7 @@ func (g *RogueGame) inventory(list []*Object, typ int) bool {
 // pickUp adds something to the character's pack (pack.c pick_up).
 func (g *RogueGame) pickUp(ch byte) {
 	p := &g.Player
-	if p.On(IsLevit) {
+	if p.On(Levitating) {
 		return
 	}
 
@@ -348,7 +348,7 @@ func (g *RogueGame) money(value int) {
 	p := &g.Player
 	p.Purse += value
 	g.mvaddch(p.Pos.Y, p.Pos.X, g.floorCh())
-	if p.Room.Flags.Has(IsGone) {
+	if p.Room.Flags.Has(Gone) {
 		g.Level.SetChar(p.Pos.Y, p.Pos.X, Passage)
 	} else {
 		g.Level.SetChar(p.Pos.Y, p.Pos.X, Floor)
@@ -364,7 +364,7 @@ func (g *RogueGame) money(value int) {
 // floorCh returns the appropriate floor character for her room
 // (pack.c floor_ch).
 func (g *RogueGame) floorCh() byte {
-	if g.Player.Room.Flags.Has(IsGone) {
+	if g.Player.Room.Flags.Has(Gone) {
 		return Passage
 	}
 	if g.showFloor() {
diff --git a/game/passages.go b/game/passages.go
index e5a0830..afccb3e 100644
--- a/game/passages.go
+++ b/game/passages.go
@@ -110,24 +110,24 @@ func (g *RogueGame) conn(r1, r2 int) {
 	var del, turnDelta, spos, epos Coord
 	var distance, turnDistance int
 	if direc == 'd' {
-		rmt := rm + 3               // room # of dest
-		rpt = &g.Level.Rooms[rmt]   // room pointer of dest
-		del = Coord{X: 0, Y: 1}     // direction of move
-		spos = rpf.Pos              // start of move
-		epos = rpt.Pos              // end of move
-		if !rpf.Flags.Has(IsGone) { // if not gone pick door pos
+		rmt := rm + 3             // room # of dest
+		rpt = &g.Level.Rooms[rmt] // room pointer of dest
+		del = Coord{X: 0, Y: 1}   // direction of move
+		spos = rpf.Pos            // start of move
+		epos = rpt.Pos            // end of move
+		if !rpf.Flags.Has(Gone) { // if not gone pick door pos
 			for {
 				spos.X = rpf.Pos.X + g.rnd(rpf.Max.X-2) + 1
 				spos.Y = rpf.Pos.Y + rpf.Max.Y - 1
-				if !(rpf.Flags.Has(IsMaze) && !g.Level.FlagsAt(spos.Y, spos.X).Has(FPass)) {
+				if !(rpf.Flags.Has(Maze) && !g.Level.FlagsAt(spos.Y, spos.X).Has(FPassage)) {
 					break
 				}
 			}
 		}
-		if !rpt.Flags.Has(IsGone) {
+		if !rpt.Flags.Has(Gone) {
 			for {
 				epos.X = rpt.Pos.X + g.rnd(rpt.Max.X-2) + 1
-				if !(rpt.Flags.Has(IsMaze) && !g.Level.FlagsAt(epos.Y, epos.X).Has(FPass)) {
+				if !(rpt.Flags.Has(Maze) && !g.Level.FlagsAt(epos.Y, epos.X).Has(FPassage)) {
 					break
 				}
 			}
@@ -146,19 +146,19 @@ func (g *RogueGame) conn(r1, r2 int) {
 		del = Coord{X: 1, Y: 0}
 		spos = rpf.Pos
 		epos = rpt.Pos
-		if !rpf.Flags.Has(IsGone) {
+		if !rpf.Flags.Has(Gone) {
 			for {
 				spos.X = rpf.Pos.X + rpf.Max.X - 1
 				spos.Y = rpf.Pos.Y + g.rnd(rpf.Max.Y-2) + 1
-				if !(rpf.Flags.Has(IsMaze) && !g.Level.FlagsAt(spos.Y, spos.X).Has(FPass)) {
+				if !(rpf.Flags.Has(Maze) && !g.Level.FlagsAt(spos.Y, spos.X).Has(FPassage)) {
 					break
 				}
 			}
 		}
-		if !rpt.Flags.Has(IsGone) {
+		if !rpt.Flags.Has(Gone) {
 			for {
 				epos.Y = rpt.Pos.Y + g.rnd(rpt.Max.Y-2) + 1
-				if !(rpt.Flags.Has(IsMaze) && !g.Level.FlagsAt(epos.Y, epos.X).Has(FPass)) {
+				if !(rpt.Flags.Has(Maze) && !g.Level.FlagsAt(epos.Y, epos.X).Has(FPassage)) {
 					break
 				}
 			}
@@ -177,12 +177,12 @@ func (g *RogueGame) conn(r1, r2 int) {
 
 	// Draw in the doors on either side of the passage or just put #'s if
 	// the rooms are gone.
-	if !rpf.Flags.Has(IsGone) {
+	if !rpf.Flags.Has(Gone) {
 		g.door(rpf, spos)
 	} else {
 		g.putpass(spos)
 	}
-	if !rpt.Flags.Has(IsGone) {
+	if !rpt.Flags.Has(Gone) {
 		g.door(rpt, epos)
 	} else {
 		g.putpass(epos)
@@ -216,7 +216,7 @@ func (g *RogueGame) conn(r1, r2 int) {
 // putpass).
 func (g *RogueGame) putpass(cp Coord) {
 	pp := g.Level.At(cp.Y, cp.X)
-	pp.Flags.Set(FPass)
+	pp.Flags.Set(FPassage)
 	if g.rnd(10)+1 < g.Depth && g.rnd(40) == 0 {
 		pp.Flags.Clear(FReal)
 	} else {
@@ -229,7 +229,7 @@ func (g *RogueGame) putpass(cp Coord) {
 func (g *RogueGame) door(rm *Room, cp Coord) {
 	rm.Exits = append(rm.Exits, cp)
 
-	if rm.Flags.Has(IsMaze) {
+	if rm.Flags.Has(Maze) {
 		return
 	}
 
@@ -252,10 +252,10 @@ func (g *RogueGame) addPass() {
 	for y := 1; y < NumLines-1; y++ {
 		for x := 0; x < NumCols; x++ {
 			pp := g.Level.At(y, x)
-			if pp.Flags.Has(FPass) || pp.Ch == Door ||
+			if pp.Flags.Has(FPassage) || pp.Ch == Door ||
 				(!pp.Flags.Has(FReal) && (pp.Ch == '|' || pp.Ch == '-')) {
 				ch := pp.Ch
-				if pp.Flags.Has(FPass) {
+				if pp.Flags.Has(FPassage) {
 					ch = Passage
 				}
 				pp.Flags.Set(FSeen)
@@ -266,7 +266,7 @@ func (g *RogueGame) addPass() {
 					g.addch(ch)
 				} else {
 					g.standout()
-					if pp.Flags.Has(FPass) {
+					if pp.Flags.Has(FPassage) {
 						g.addch(Passage)
 					} else {
 						g.addch(Door)
@@ -301,7 +301,7 @@ func (g *RogueGame) numpass(y, x int) {
 		return
 	}
 	fp := g.Level.FlagsAt(y, x)
-	if fp.Has(FPNum) {
+	if fp.Has(FPassNum) {
 		return
 	}
 	if g.newpnum {
@@ -314,7 +314,7 @@ func (g *RogueGame) numpass(y, x int) {
 		(!fp.Has(FReal) && (ch == '|' || ch == '-')) {
 		rp := &g.Level.Passages[g.pnum]
 		rp.Exits = append(rp.Exits, Coord{Y: y, X: x})
-	} else if !fp.Has(FPass) {
+	} else if !fp.Has(FPassage) {
 		return
 	}
 	*fp |= PlaceFlags(g.pnum)
diff --git a/game/potions.go b/game/potions.go
index f49b408..8a83402 100644
--- a/game/potions.go
+++ b/game/potions.go
@@ -15,18 +15,18 @@ type pact struct {
 
 // pActions is potions.c p_actions[]. The P_SEEINVIS message is dynamic
 // (it names the fruit) and is computed in doPot.
-var pActions = [MaxPotions]pact{
-	PConfuse: {IsHuh, DUnconfuse, HuhDuration,
+var pActions = [NumPotionTypes]pact{
+	PotionConfusion: {Confused, DUnconfuse, HuhDuration,
 		"what a tripy feeling!",
 		"wait, what's going on here. Huh? What? Who?"},
-	PLSD: {IsHalu, DComeDown, SeeDuration,
+	PotionLSD: {Hallucinating, DComeDown, SeeDuration,
 		"Oh, wow!  Everything seems so cosmic!",
 		"Oh, wow!  Everything seems so cosmic!"},
-	PSeeInvis: {CanSee, DUnsee, SeeDuration, "", ""},
-	PBlind: {IsBlind, DSight, SeeDuration,
+	PotionSeeInvisible: {CanSeeInvisible, DUnsee, SeeDuration, "", ""},
+	PotionBlindness: {Blind, DSight, SeeDuration,
 		"oh, bummer!  Everything is dark!  Help!",
 		"a cloak of darkness falls around you"},
-	PLevit: {IsLevit, DLand, HealTime,
+	PotionLevitation: {Levitating, DLand, HealTime,
 		"oh, wow!  You're floating in the air!",
 		"you start to float in the air"},
 }
@@ -52,40 +52,40 @@ func (g *RogueGame) quaff() {
 	}
 
 	// Calculate the effect it has on the poor guy.
-	trip := p.On(IsHalu)
+	trip := p.On(Hallucinating)
 	g.leavePack(obj, false, false)
 	switch obj.Which {
-	case PConfuse:
-		g.doPot(PConfuse, !trip)
-	case PPoison:
-		g.Items.Potions[PPoison].Know = true
-		if p.IsWearing(RSustStr) {
+	case PotionConfusion:
+		g.doPot(PotionConfusion, !trip)
+	case PotionPoison:
+		g.Items.Potions[PotionPoison].Know = true
+		if p.IsWearing(RingSustainStrength) {
 			g.msg("you feel momentarily sick")
 		} else {
 			g.chgStr(-(g.rnd(3) + 1))
 			g.msg("you feel very sick now")
 			g.comeDown(0)
 		}
-	case PHealing:
-		g.Items.Potions[PHealing].Know = true
+	case PotionHealing:
+		g.Items.Potions[PotionHealing].Know = true
 		if p.Stats.HP += g.roll(p.Stats.Lvl, 4); p.Stats.HP > p.Stats.MaxHP {
 			p.Stats.MaxHP++
 			p.Stats.HP = p.Stats.MaxHP
 		}
 		g.sight(0)
 		g.msg("you begin to feel better")
-	case PStrength:
-		g.Items.Potions[PStrength].Know = true
+	case PotionGainStrength:
+		g.Items.Potions[PotionGainStrength].Know = true
 		g.chgStr(1)
 		g.msg("you feel stronger, now.  What bulging muscles!")
-	case PMFind:
-		p.Flags.Set(SeeMonst)
+	case PotionDetectMonsters:
+		p.Flags.Set(SenseMonsters)
 		g.Fuse(DTurnSee, 1, HuhDuration, After)
 		if !g.turnSee(false) {
 			g.msg("you have a %s feeling for a moment, then it passes",
 				g.chooseStr("normal", "strange"))
 		}
-	case PTFind:
+	case PotionDetectMagic:
 		// Potion of magic detection.  Show the potions and scrolls
 		show := false
 		if len(g.Level.Objects) > 0 {
@@ -94,7 +94,7 @@ func (g *RogueGame) quaff() {
 				if tp.isMagic() {
 					show = true
 					g.scr.Hw.MvAddCh(tp.Pos.Y, tp.Pos.X, Magic)
-					g.Items.Potions[PTFind].Know = true
+					g.Items.Potions[PotionDetectMagic].Know = true
 				}
 			}
 			for _, mp := range g.Level.Monsters {
@@ -107,34 +107,34 @@ func (g *RogueGame) quaff() {
 			}
 		}
 		if show {
-			g.Items.Potions[PTFind].Know = true
+			g.Items.Potions[PotionDetectMagic].Know = true
 			g.showWin("You sense the presence of magic on this level.--More--")
 		} else {
 			g.msg("you have a %s feeling for a moment, then it passes",
 				g.chooseStr("normal", "strange"))
 		}
-	case PLSD:
+	case PotionLSD:
 		if !trip {
-			if p.On(SeeMonst) {
+			if p.On(SenseMonsters) {
 				g.turnSee(false)
 			}
 			g.StartDaemon(DVisuals, 0, Before)
 			g.SeenStairs = g.seenStairs()
 		}
-		g.doPot(PLSD, true)
-	case PSeeInvis:
-		show := p.On(CanSee)
-		g.doPot(PSeeInvis, false)
+		g.doPot(PotionLSD, true)
+	case PotionSeeInvisible:
+		show := p.On(CanSeeInvisible)
+		g.doPot(PotionSeeInvisible, false)
 		if !show {
 			g.invisOn()
 		}
 		g.sight(0)
-	case PRaise:
-		g.Items.Potions[PRaise].Know = true
+	case PotionRaiseLevel:
+		g.Items.Potions[PotionRaiseLevel].Know = true
 		g.msg("you suddenly feel much more skillful")
 		g.raiseLevel()
-	case PXHeal:
-		g.Items.Potions[PXHeal].Know = true
+	case PotionExtraHealing:
+		g.Items.Potions[PotionExtraHealing].Know = true
 		if p.Stats.HP += g.roll(p.Stats.Lvl, 8); p.Stats.HP > p.Stats.MaxHP {
 			if p.Stats.HP > p.Stats.MaxHP+p.Stats.Lvl+1 {
 				p.Stats.MaxHP++
@@ -145,33 +145,33 @@ func (g *RogueGame) quaff() {
 		g.sight(0)
 		g.comeDown(0)
 		g.msg("you begin to feel much better")
-	case PHaste:
-		g.Items.Potions[PHaste].Know = true
+	case PotionHaste:
+		g.Items.Potions[PotionHaste].Know = true
 		g.After = false
 		if g.addHaste(true) {
 			g.msg("you feel yourself moving much faster")
 		}
-	case PRestore:
-		if p.IsRing(Left, RAddStr) {
+	case PotionRestoreStrength:
+		if p.IsRing(Left, RingAddStrength) {
 			addStr(&p.Stats.Str, -p.CurRing[Left].Arm)
 		}
-		if p.IsRing(Right, RAddStr) {
+		if p.IsRing(Right, RingAddStrength) {
 			addStr(&p.Stats.Str, -p.CurRing[Right].Arm)
 		}
 		if p.Stats.Str < p.MaxStats.Str {
 			p.Stats.Str = p.MaxStats.Str
 		}
-		if p.IsRing(Left, RAddStr) {
+		if p.IsRing(Left, RingAddStrength) {
 			addStr(&p.Stats.Str, p.CurRing[Left].Arm)
 		}
-		if p.IsRing(Right, RAddStr) {
+		if p.IsRing(Right, RingAddStrength) {
 			addStr(&p.Stats.Str, p.CurRing[Right].Arm)
 		}
 		g.msg("hey, this tastes great.  It make you feel warm all over")
-	case PBlind:
-		g.doPot(PBlind, true)
-	case PLevit:
-		g.doPot(PLevit, true)
+	case PotionBlindness:
+		g.doPot(PotionBlindness, true)
+	case PotionLevitation:
+		g.doPot(PotionLevitation, true)
 	}
 	g.status()
 	// Throw the item away
@@ -201,7 +201,7 @@ func (g *RogueGame) doPot(typ int, knowit bool) {
 		g.Lengthen(pp.daemon, t)
 	}
 	high, straight := pp.high, pp.straight
-	if typ == PSeeInvis {
+	if typ == PotionSeeInvisible {
 		s := fmt.Sprintf("this potion tastes like %s juice", g.Fruit)
 		high, straight = s, s
 	}
@@ -212,7 +212,7 @@ func (g *RogueGame) doPot(typ int, knowit bool) {
 func (o *Object) isMagic() bool {
 	switch o.Type {
 	case Armor:
-		return o.Flags.Has(IsProt) || o.Arm != aClass[o.Which]
+		return o.Flags.Has(Protected) || o.Arm != aClass[o.Which]
 	case Weapon:
 		return o.HPlus != 0 || o.DPlus != 0
 	case Potion, Scroll, Stick, Ring, Amulet:
@@ -224,9 +224,9 @@ func (o *Object) isMagic() bool {
 // invisOn turns on the ability to see invisible monsters (potions.c
 // invis_on).
 func (g *RogueGame) invisOn() {
-	g.Player.Flags.Set(CanSee)
+	g.Player.Flags.Set(CanSeeInvisible)
 	for _, mp := range g.Level.Monsters {
-		if mp.On(IsInvis) && g.seeMonst(mp) && !g.Player.On(IsHalu) {
+		if mp.On(Invisible) && g.seeMonst(mp) && !g.Player.On(Hallucinating) {
 			g.mvaddch(mp.Pos.Y, mp.Pos.X, mp.Disguise)
 		}
 	}
@@ -247,7 +247,7 @@ func (g *RogueGame) turnSee(turnOff bool) bool {
 			if !canSee {
 				g.standout()
 			}
-			if !g.Player.On(IsHalu) {
+			if !g.Player.On(Hallucinating) {
 				g.addch(mp.Type)
 			} else {
 				g.addch(byte(g.rnd(26) + 'A'))
@@ -259,9 +259,9 @@ func (g *RogueGame) turnSee(turnOff bool) bool {
 		}
 	}
 	if turnOff {
-		g.Player.Flags.Clear(SeeMonst)
+		g.Player.Flags.Clear(SenseMonsters)
 	} else {
-		g.Player.Flags.Set(SeeMonst)
+		g.Player.Flags.Set(SenseMonsters)
 	}
 	return addNew
 }
@@ -279,10 +279,10 @@ func (g *RogueGame) seenStairs() bool {
 	}
 	// if a monster is on the stairs, this gets hairy
 	if tp := g.Level.MonsterAt(st.Y, st.X); tp != nil {
-		if g.seeMonst(tp) && tp.On(IsRun) { // visible and awake:
+		if g.seeMonst(tp) && tp.On(Awake) { // visible and awake:
 			return true // it must have moved there
 		}
-		if g.Player.On(SeeMonst) && tp.OldCh == Stairs {
+		if g.Player.On(SenseMonsters) && tp.OldCh == Stairs {
 			return true
 		}
 	}
diff --git a/game/rings.go b/game/rings.go
index 80796a9..6f957f4 100644
--- a/game/rings.go
+++ b/game/rings.go
@@ -48,11 +48,11 @@ func (g *RogueGame) ringOn() {
 
 	// Calculate the effect it has on the poor guy.
 	switch obj.Which {
-	case RAddStr:
+	case RingAddStrength:
 		g.chgStr(obj.Arm)
-	case RSeeInvis:
+	case RingSeeInvisible:
 		g.invisOn()
-	case RAggr:
+	case RingAggravateMonsters:
 		g.aggravate()
 	}
 
@@ -123,7 +123,7 @@ func (g *RogueGame) gethand() int {
 
 // ringUses is the rings.c ring_eat static uses[] table: how much food each
 // ring type uses up per turn (negative = a 1-in-n chance of 1).
-var ringUses = [MaxRings]int{
+var ringUses = [NumRingTypes]int{
 	1,  // R_PROTECT
 	1,  // R_ADDSTR
 	1,  // R_SUSTSTR
@@ -155,7 +155,7 @@ func (g *RogueGame) ringEat(hand int) int {
 			eat = 0
 		}
 	}
-	if ring.Which == RDigest {
+	if ring.Which == RingSlowDigestion {
 		eat = -eat
 	}
 	return eat
@@ -163,11 +163,11 @@ func (g *RogueGame) ringEat(hand int) int {
 
 // ringNum prints ring bonuses (rings.c ring_num).
 func ringNum(g *RogueGame, obj *Object) string {
-	if !obj.Flags.Has(IsKnow) {
+	if !obj.Flags.Has(Known) {
 		return ""
 	}
 	switch obj.Which {
-	case RProtect, RAddStr, RAddDam, RAddHit:
+	case RingProtection, RingAddStrength, RingIncreaseDamage, RingDexterity:
 		return fmt.Sprintf(" [%s]", num(obj.Arm, 0, Ring))
 	}
 	return ""
diff --git a/game/rip.go b/game/rip.go
index 2228c26..50b9cd5 100644
--- a/game/rip.go
+++ b/game/rip.go
@@ -121,12 +121,12 @@ func (g *RogueGame) totalWinner() {
 		case Weapon:
 			worth = it.Weapons[obj.Which].Worth
 			worth *= 3*(obj.HPlus+obj.DPlus) + obj.Count
-			obj.Flags.Set(IsKnow)
+			obj.Flags.Set(Known)
 		case Armor:
 			worth = it.Armors[obj.Which].Worth
 			worth += (9 - obj.Arm) * 100
 			worth += 10 * (aClass[obj.Which] - obj.Arm)
-			obj.Flags.Set(IsKnow)
+			obj.Flags.Set(Known)
 		case Scroll:
 			op := &it.Scrolls[obj.Which]
 			worth = op.Worth * obj.Count
@@ -144,27 +144,27 @@ func (g *RogueGame) totalWinner() {
 		case Ring:
 			op := &it.Rings[obj.Which]
 			worth = op.Worth
-			if obj.Which == RAddStr || obj.Which == RAddDam ||
-				obj.Which == RProtect || obj.Which == RAddHit {
+			if obj.Which == RingAddStrength || obj.Which == RingIncreaseDamage ||
+				obj.Which == RingProtection || obj.Which == RingDexterity {
 				if obj.Arm > 0 {
 					worth += obj.Arm * 100
 				} else {
 					worth = 10
 				}
 			}
-			if !obj.Flags.Has(IsKnow) {
+			if !obj.Flags.Has(Known) {
 				worth /= 2
 			}
-			obj.Flags.Set(IsKnow)
+			obj.Flags.Set(Known)
 			op.Know = true
 		case Stick:
 			op := &it.Sticks[obj.Which]
 			worth = op.Worth
 			worth += 20 * obj.Charges()
-			if !obj.Flags.Has(IsKnow) {
+			if !obj.Flags.Has(Known) {
 				worth /= 2
 			}
-			obj.Flags.Set(IsKnow)
+			obj.Flags.Set(Known)
 			op.Know = true
 		case Amulet:
 			worth = 1000
diff --git a/game/rooms.go b/game/rooms.go
index 76ade24..f6b04c3 100644
--- a/game/rooms.go
+++ b/game/rooms.go
@@ -33,14 +33,14 @@ func (g *RogueGame) doRooms() {
 	// Put the gone rooms, if any, on the level
 	leftOut := g.rnd(4)
 	for i := 0; i < leftOut; i++ {
-		g.Level.Rooms[g.rndRoom()].Flags.Set(IsGone)
+		g.Level.Rooms[g.rndRoom()].Flags.Set(Gone)
 	}
 	// dig and populate all the rooms on the level
 	for i := range g.Level.Rooms {
 		rp := &g.Level.Rooms[i]
 		// Find upper left corner of box that this room goes in
 		top := Coord{X: (i%3)*bsze.X + 1, Y: (i / 3) * bsze.Y}
-		if rp.Flags.Has(IsGone) {
+		if rp.Flags.Has(Gone) {
 			// Place a gone room.  Make certain that there is a blank line
 			// for passage drawing.
 			for {
@@ -56,13 +56,13 @@ func (g *RogueGame) doRooms() {
 		}
 		// set room type
 		if g.rnd(10) < g.Depth-1 {
-			rp.Flags.Set(IsDark) // dark room
+			rp.Flags.Set(Dark) // dark room
 			if g.rnd(15) == 0 {
-				rp.Flags = IsMaze // maze room
+				rp.Flags = Maze // maze room
 			}
 		}
 		// Find a place and size for a random room
-		if rp.Flags.Has(IsMaze) {
+		if rp.Flags.Has(Maze) {
 			rp.Max.X = bsze.X - 1
 			rp.Max.Y = bsze.Y - 1
 			if rp.Pos.X = top.X; rp.Pos.X == 1 {
@@ -92,7 +92,7 @@ func (g *RogueGame) doRooms() {
 			rp.Gold, _ = g.findFloorIn(rp, 0, false)
 			gold.Pos = rp.Gold
 			g.Level.SetChar(rp.Gold.Y, rp.Gold.X, Gold)
-			gold.Flags = IsMany
+			gold.Flags = Stackable
 			gold.Group = goldGrp
 			gold.Type = Gold
 			attachObj(&g.Level.Objects, gold)
@@ -114,7 +114,7 @@ func (g *RogueGame) doRooms() {
 // drawRoom draws a box around a room and lays down the floor for normal
 // rooms; for maze rooms, draws the maze (rooms.c draw_room).
 func (g *RogueGame) drawRoom(rp *Room) {
-	if rp.Flags.Has(IsMaze) {
+	if rp.Flags.Has(Maze) {
 		g.doMaze(rp)
 		return
 	}
@@ -180,7 +180,7 @@ func (g *RogueGame) dig(y, x int) {
 			if newy < 0 || newy > m.maxy || newx < 0 || newx > m.maxx {
 				continue
 			}
-			if g.Level.FlagsAt(newy+m.starty, newx+m.startx).Has(FPass) {
+			if g.Level.FlagsAt(newy+m.starty, newx+m.startx).Has(FPassage) {
 				continue
 			}
 			if cnt++; g.rnd(cnt) == 0 {
@@ -257,7 +257,7 @@ func (g *RogueGame) findFloorImpl(rp *Room, limit int, monst, pickroom bool) (Co
 	var compchar byte
 	if !pickroom {
 		compchar = Floor
-		if rp.Flags.Has(IsMaze) {
+		if rp.Flags.Has(Maze) {
 			compchar = Passage
 		}
 	}
@@ -271,7 +271,7 @@ func (g *RogueGame) findFloorImpl(rp *Room, limit int, monst, pickroom bool) (Co
 		if pickroom {
 			rp = &g.Level.Rooms[g.rndRoom()]
 			compchar = Floor
-			if rp.Flags.Has(IsMaze) {
+			if rp.Flags.Has(Maze) {
 				compchar = Passage
 			}
 		}
@@ -294,7 +294,7 @@ func (g *RogueGame) enterRoom(cp Coord) {
 	rp := g.roomin(cp)
 	p.Room = rp
 	g.doorOpen(rp)
-	if !rp.Flags.Has(IsDark) && !p.On(IsBlind) {
+	if !rp.Flags.Has(Dark) && !p.On(Blind) {
 		for y := rp.Pos.Y; y < rp.Max.Y+rp.Pos.Y; y++ {
 			g.move(y, rp.Pos.X)
 			for x := rp.Pos.X; x < rp.Max.X+rp.Pos.X; x++ {
@@ -309,7 +309,7 @@ func (g *RogueGame) enterRoom(cp Coord) {
 				} else {
 					tp.OldCh = ch
 					if !g.seeMonst(tp) {
-						if p.On(SeeMonst) {
+						if p.On(SenseMonsters) {
 							g.standout()
 							g.addch(tp.Disguise)
 							g.standend()
@@ -330,21 +330,21 @@ func (g *RogueGame) leaveRoom(cp Coord) {
 	p := &g.Player
 	rp := p.Room
 
-	if rp.Flags.Has(IsMaze) {
+	if rp.Flags.Has(Maze) {
 		return
 	}
 
 	var floor byte
 	switch {
-	case rp.Flags.Has(IsGone):
+	case rp.Flags.Has(Gone):
 		floor = Passage
-	case !rp.Flags.Has(IsDark) || p.On(IsBlind):
+	case !rp.Flags.Has(Dark) || p.On(Blind):
 		floor = Floor
 	default:
 		floor = ' '
 	}
 
-	p.Room = &g.Level.Passages[*g.Level.FlagsAt(cp.Y, cp.X)&FPNum]
+	p.Room = &g.Level.Passages[*g.Level.FlagsAt(cp.Y, cp.X)&FPassNum]
 	for y := rp.Pos.Y; y < rp.Max.Y+rp.Pos.Y; y++ {
 		for x := rp.Pos.X; x < rp.Max.X+rp.Pos.X; x++ {
 			g.move(y, x)
@@ -357,7 +357,7 @@ func (g *RogueGame) leaveRoom(cp Coord) {
 				// to check for monster, we have to strip out the standout
 				// bit (our Window returns the bare character already)
 				if isUpper(ch) {
-					if p.On(SeeMonst) {
+					if p.On(SenseMonsters) {
 						g.standout()
 						g.addch(ch)
 						g.standend()
diff --git a/game/save.go b/game/save.go
index 599074e..78e5433 100644
--- a/game/save.go
+++ b/game/save.go
@@ -74,14 +74,14 @@ type SaveState struct {
 	HasAmulet  bool
 	SeenStairs bool
 
-	Places   []savedPlace
-	Rooms    [MaxRooms]Room
-	Passages [MaxPass]Room
-	Objects  []Object
-	Monsters []savedCreature
-	Dests    []destRef // parallel to Monsters
-	Stairs   Coord
-	NTraps   int
+	Places    []savedPlace
+	Rooms     [MaxRooms]Room
+	Passages  [MaxPass]Room
+	Objects   []Object
+	Monsters  []savedCreature
+	Dests     []destRef // parallel to Monsters
+	Stairs    Coord
+	TrapCount int
 
 	After     bool
 	Again     bool
@@ -179,7 +179,7 @@ func (g *RogueGame) snapshot() *SaveState {
 		Rooms:      g.Level.Rooms,
 		Passages:   g.Level.Passages,
 		Stairs:     g.Level.Stairs,
-		NTraps:     g.Level.NTraps,
+		TrapCount:  g.Level.TrapCount,
 		After:      g.After,
 		Again:      g.Again,
 		NoScoreF:   g.NoScore,
@@ -308,7 +308,7 @@ func (g *RogueGame) applySnapshot(st *SaveState) {
 	g.Level.Rooms = st.Rooms
 	g.Level.Passages = st.Passages
 	g.Level.Stairs = st.Stairs
-	g.Level.NTraps = st.NTraps
+	g.Level.TrapCount = st.TrapCount
 	g.After = st.After
 	g.Again = st.Again
 	g.NoScore = st.NoScoreF
diff --git a/game/save_test.go b/game/save_test.go
index 8916283..a35f6ab 100644
--- a/game/save_test.go
+++ b/game/save_test.go
@@ -13,11 +13,11 @@ func TestSaveRestoreRoundTrip(t *testing.T) {
 	g.Player.Purse = 123
 	g.Player.FoodLeft = 777
 	g.HasAmulet = true
-	g.Items.Potions[PHealing].Know = true
-	g.Items.Scrolls[SMap].Guess = "map???"
+	g.Items.Potions[PotionHealing].Know = true
+	g.Items.Scrolls[ScrollMagicMapping].Guess = "map???"
 	g.Monsters['F'-'A'].Stats.Dmg = "3x1" // mutated bestiary must survive
 	if len(g.Level.Monsters) > 0 {
-		g.Level.Monsters[0].Flags.Set(IsRun)
+		g.Level.Monsters[0].Flags.Set(Awake)
 		g.Level.Monsters[0].Dest = &g.Player.Pos
 	}
 
@@ -42,10 +42,10 @@ func TestSaveRestoreRoundTrip(t *testing.T) {
 	if !h.HasAmulet {
 		t.Error("amulet flag lost")
 	}
-	if !h.Items.Potions[PHealing].Know {
+	if !h.Items.Potions[PotionHealing].Know {
 		t.Error("potion identification lost")
 	}
-	if h.Items.Scrolls[SMap].Guess != "map???" {
+	if h.Items.Scrolls[ScrollMagicMapping].Guess != "map???" {
 		t.Error("scroll guess lost")
 	}
 	if h.Monsters['F'-'A'].Stats.Dmg != "3x1" {
diff --git a/game/scrolls.go b/game/scrolls.go
index 29e0cbf..9c15f0d 100644
--- a/game/scrolls.go
+++ b/game/scrolls.go
@@ -4,12 +4,12 @@ package game
 
 // idType maps identify scrolls to the type they identify (scrolls.c
 // static id_type).
-var idType = [SIDRorS + 1]int{
-	SIDPotion: int(Potion),
-	SIDScroll: int(Scroll),
-	SIDWeapon: int(Weapon),
-	SIDArmor:  int(Armor),
-	SIDRorS:   RorS,
+var idType = [ScrollIdentifyRingOrStick + 1]int{
+	ScrollIdentifyPotion:      int(Potion),
+	ScrollIdentifyScroll:      int(Scroll),
+	ScrollIdentifyWeapon:      int(Weapon),
+	ScrollIdentifyArmor:       int(Armor),
+	ScrollIdentifyRingOrStick: RorS,
 }
 
 // readScroll reads a scroll from the pack and does the appropriate thing
@@ -36,17 +36,17 @@ func (g *RogueGame) readScroll() {
 	g.leavePack(obj, false, false)
 
 	switch obj.Which {
-	case SConfuse:
+	case ScrollMonsterConfusion:
 		// Scroll of monster confusion.  Give him that power.
-		p.Flags.Set(CanHuh)
+		p.Flags.Set(CanConfuse)
 		g.msg("your hands begin to glow %s", g.pickColor("red"))
-	case SArmor:
+	case ScrollEnchantArmor:
 		if p.CurArmor != nil {
 			p.CurArmor.Arm--
-			p.CurArmor.Flags.Clear(IsCursed)
+			p.CurArmor.Flags.Clear(Cursed)
 			g.msg("your armor glows %s for a moment", g.pickColor("silver"))
 		}
-	case SHold:
+	case ScrollHoldMonster:
 		// Hold monster scroll.  Stop all monsters within two spaces from
 		// chasing after the hero.
 		held := 0
@@ -58,9 +58,9 @@ func (g *RogueGame) readScroll() {
 				if y < 0 || y > NumLines-1 {
 					continue
 				}
-				if mp := g.Level.MonsterAt(y, x); mp != nil && mp.On(IsRun) {
-					mp.Flags.Clear(IsRun)
-					mp.Flags.Set(IsHeld)
+				if mp := g.Level.MonsterAt(y, x); mp != nil && mp.On(Awake) {
+					mp.Flags.Clear(Awake)
+					mp.Flags.Set(Held)
 					held++
 				}
 			}
@@ -75,17 +75,17 @@ func (g *RogueGame) readScroll() {
 				g.addmsg("s")
 			}
 			g.endmsg()
-			g.Items.Scrolls[SHold].Know = true
+			g.Items.Scrolls[ScrollHoldMonster].Know = true
 		} else {
 			g.msg("you feel a strange sense of loss")
 		}
-	case SSleep:
+	case ScrollSleep:
 		// Scroll which makes you fall asleep
-		g.Items.Scrolls[SSleep].Know = true
+		g.Items.Scrolls[ScrollSleep].Know = true
 		g.NoCommand += g.rnd(g.spread(5)) + 4 // SLEEPTIME
-		p.Flags.Clear(IsRun)
+		p.Flags.Clear(Awake)
 		g.msg("you fall asleep")
-	case SCreate:
+	case ScrollCreateMonster:
 		// Create a monster: first look in a circle around him, next try
 		// his room, otherwise give up
 		i := 0
@@ -99,7 +99,7 @@ func (g *RogueGame) readScroll() {
 				// Or anything else nasty
 				if ch := g.Level.VisibleChar(y, x); stepOk(ch) {
 					if ch == Scroll {
-						if fo := g.findObj(y, x); fo != nil && fo.Which == SScare {
+						if fo := g.findObj(y, x); fo != nil && fo.Which == ScrollScareMonster {
 							continue
 						}
 					}
@@ -115,14 +115,14 @@ func (g *RogueGame) readScroll() {
 			tp := &Monster{}
 			g.newMonster(tp, g.randMonster(false), mp)
 		}
-	case SIDPotion, SIDScroll, SIDWeapon, SIDArmor, SIDRorS:
+	case ScrollIdentifyPotion, ScrollIdentifyScroll, ScrollIdentifyWeapon, ScrollIdentifyArmor, ScrollIdentifyRingOrStick:
 		// Identify, let him figure something out
 		g.Items.Scrolls[obj.Which].Know = true
 		g.msg("this scroll is an %s scroll", g.Items.Scrolls[obj.Which].Name)
 		g.whatis(true, idType[obj.Which])
-	case SMap:
+	case ScrollMagicMapping:
 		// Scroll of magic mapping.
-		g.Items.Scrolls[SMap].Know = true
+		g.Items.Scrolls[ScrollMagicMapping].Know = true
 		g.msg("oh, now this scroll has a map on it")
 		// take all the things we want to keep hidden out of the window
 		for y := 1; y < NumLines-1; y++ {
@@ -141,7 +141,7 @@ func (g *RogueGame) readScroll() {
 				case ' ':
 					if pp.Flags.Has(FReal) {
 						// def: hidden things in walls stay hidden
-						if pp.Flags.Has(FPass) {
+						if pp.Flags.Has(FPassage) {
 							pass = true
 						} else {
 							ch = ' '
@@ -162,7 +162,7 @@ func (g *RogueGame) readScroll() {
 						pp.Flags.Set(FSeen | FReal)
 					}
 				default:
-					if pp.Flags.Has(FPass) {
+					if pp.Flags.Has(FPassage) {
 						pass = true
 					} else {
 						ch = ' '
@@ -178,7 +178,7 @@ func (g *RogueGame) readScroll() {
 				if ch != ' ' {
 					if tp := pp.Monst; tp != nil {
 						tp.OldCh = ch
-						if !p.On(SeeMonst) {
+						if !p.On(SenseMonsters) {
 							g.mvaddch(y, x, ch)
 						}
 					} else {
@@ -187,7 +187,7 @@ func (g *RogueGame) readScroll() {
 				}
 			}
 		}
-	case SFDet:
+	case ScrollFoodDetection:
 		// Food detection
 		found := false
 		g.scr.Hw.Clear()
@@ -198,23 +198,23 @@ func (g *RogueGame) readScroll() {
 			}
 		}
 		if found {
-			g.Items.Scrolls[SFDet].Know = true
+			g.Items.Scrolls[ScrollFoodDetection].Know = true
 			g.showWin("Your nose tingles and you smell food.--More--")
 		} else {
 			g.msg("your nose tingles")
 		}
-	case STelep:
+	case ScrollTeleportation:
 		// Scroll of teleportation: make him disappear and reappear
 		curRoom := p.Room
 		g.teleport()
 		if curRoom != p.Room {
-			g.Items.Scrolls[STelep].Know = true
+			g.Items.Scrolls[ScrollTeleportation].Know = true
 		}
-	case SEnch:
+	case ScrollEnchantWeapon:
 		if p.CurWeapon == nil || p.CurWeapon.Type != Weapon {
 			g.msg("you feel a strange sense of loss")
 		} else {
-			p.CurWeapon.Flags.Clear(IsCursed)
+			p.CurWeapon.Flags.Clear(Cursed)
 			if g.rnd(2) == 0 {
 				p.CurWeapon.HPlus++
 			} else {
@@ -223,25 +223,25 @@ func (g *RogueGame) readScroll() {
 			g.msg("your %s glows %s for a moment",
 				g.Items.Weapons[p.CurWeapon.Which].Name, g.pickColor("blue"))
 		}
-	case SScare:
+	case ScrollScareMonster:
 		// Reading it is a mistake and produces laughter at her poor boo
 		// boo.
 		g.msg("you hear maniacal laughter in the distance")
-	case SRemove:
+	case ScrollRemoveCurse:
 		uncurse(p.CurArmor)
 		uncurse(p.CurWeapon)
 		uncurse(p.CurRing[Left])
 		uncurse(p.CurRing[Right])
 		g.msg("%s", g.chooseStr("you feel in touch with the Universal Onenes",
 			"you feel as if somebody is watching over you"))
-	case SAggr:
+	case ScrollAggravateMonsters:
 		// This scroll aggravates all the monsters on the current level
 		// and sets them running towards the hero
 		g.aggravate()
 		g.msg("you hear a high pitched humming noise")
-	case SProtect:
+	case ScrollProtectArmor:
 		if p.CurArmor != nil {
-			p.CurArmor.Flags.Set(IsProt)
+			p.CurArmor.Flags.Set(Protected)
 			g.msg("your armor is covered by a shimmering %s shield",
 				g.pickColor("gold"))
 		} else {
@@ -257,6 +257,6 @@ func (g *RogueGame) readScroll() {
 // uncurse uncurses an item (scrolls.c uncurse).
 func uncurse(obj *Object) {
 	if obj != nil {
-		obj.Flags.Clear(IsCursed)
+		obj.Flags.Clear(Cursed)
 	}
 }
diff --git a/game/sticks.go b/game/sticks.go
index ccd9da8..822d1ab 100644
--- a/game/sticks.go
+++ b/game/sticks.go
@@ -21,13 +21,13 @@ func (g *RogueGame) doZap() {
 		return
 	}
 	switch obj.Which {
-	case WsLight:
+	case WandLight:
 		// Reddy Kilowatt wand.  Light up the room
-		g.Items.Sticks[WsLight].Know = true
-		if p.Room.Flags.Has(IsGone) {
+		g.Items.Sticks[WandLight].Know = true
+		if p.Room.Flags.Has(Gone) {
 			g.msg("the corridor glows and then fades")
 		} else {
-			p.Room.Flags.Clear(IsDark)
+			p.Room.Flags.Clear(Dark)
 			// Light the room and put the player back up
 			g.enterRoom(p.Pos)
 			g.addmsg("the room is lit")
@@ -36,7 +36,7 @@ func (g *RogueGame) doZap() {
 			}
 			g.endmsg()
 		}
-	case WsDrain:
+	case WandDrainLife:
 		// take away 1/2 of hero's hit points, then take it away evenly
 		// from the monsters in the room (or next to hero if he is in a
 		// passage)
@@ -45,7 +45,7 @@ func (g *RogueGame) doZap() {
 			return
 		}
 		g.drain()
-	case WsInvis, WsPolymorph, WsTelAway, WsTelTo, WsCancel:
+	case WandInvisibility, WandPolymorph, WandTeleportAway, WandTeleportTo, WandCancellation:
 		y := p.Pos.Y
 		x := p.Pos.X
 		for stepOk(g.Level.VisibleChar(y, x)) {
@@ -55,15 +55,15 @@ func (g *RogueGame) doZap() {
 		if tp := g.Level.MonsterAt(y, x); tp != nil {
 			monster := tp.Type
 			if monster == 'F' {
-				p.Flags.Clear(IsHeld)
+				p.Flags.Clear(Held)
 			}
 			switch obj.Which {
-			case WsInvis:
-				tp.Flags.Set(IsInvis)
+			case WandInvisibility:
+				tp.Flags.Set(Invisible)
 				if g.cansee(y, x) {
 					g.mvaddch(y, x, tp.OldCh)
 				}
-			case WsPolymorph:
+			case WandPolymorph:
 				pp := tp.Pack
 				detachMon(&g.Level.Monsters, tp)
 				if g.seeMonst(tp) {
@@ -80,18 +80,18 @@ func (g *RogueGame) doZap() {
 				tp.OldCh = oldch
 				tp.Pack = pp
 				if g.seeMonst(tp) {
-					g.Items.Sticks[WsPolymorph].Know = true
+					g.Items.Sticks[WandPolymorph].Know = true
 				}
-			case WsCancel:
-				tp.Flags.Set(IsCanc)
-				tp.Flags.Clear(IsInvis | CanHuh)
+			case WandCancellation:
+				tp.Flags.Set(Cancelled)
+				tp.Flags.Clear(Invisible | CanConfuse)
 				tp.Disguise = tp.Type
 				if g.seeMonst(tp) {
 					g.mvaddch(y, x, tp.Disguise)
 				}
-			case WsTelAway, WsTelTo:
+			case WandTeleportAway, WandTeleportTo:
 				var newPos Coord
-				if obj.Which == WsTelAway {
+				if obj.Which == WandTeleportAway {
 					for {
 						newPos, _ = g.findFloor(nil, 0, true)
 						if newPos != p.Pos {
@@ -103,18 +103,18 @@ func (g *RogueGame) doZap() {
 					newPos.X = p.Pos.X + g.Delta.X
 				}
 				tp.Dest = &p.Pos
-				tp.Flags.Set(IsRun)
+				tp.Flags.Set(Awake)
 				g.relocate(tp, newPos)
 			}
 		}
-	case WsMissile:
-		g.Items.Sticks[WsMissile].Know = true
+	case WandMagicMissile:
+		g.Items.Sticks[WandMagicMissile].Know = true
 		bolt := newObject()
 		bolt.Type = '*'
 		bolt.HurlDmg = "1x4"
 		bolt.HPlus = 100
 		bolt.DPlus = 1
-		bolt.Flags = IsMissl
+		bolt.Flags = Missile
 		if p.CurWeapon != nil {
 			bolt.Launch = p.CurWeapon.Which
 		}
@@ -127,7 +127,7 @@ func (g *RogueGame) doZap() {
 		} else {
 			g.msg("the missle vanishes with a puff of smoke")
 		}
-	case WsHasteM, WsSlowM:
+	case WandHasteMonster, WandSlowMonster:
 		y := p.Pos.Y
 		x := p.Pos.X
 		for stepOk(g.Level.VisibleChar(y, x)) {
@@ -135,17 +135,17 @@ func (g *RogueGame) doZap() {
 			x += g.Delta.X
 		}
 		if tp := g.Level.MonsterAt(y, x); tp != nil {
-			if obj.Which == WsHasteM {
-				if tp.On(IsSlow) {
-					tp.Flags.Clear(IsSlow)
+			if obj.Which == WandHasteMonster {
+				if tp.On(Slowed) {
+					tp.Flags.Clear(Slowed)
 				} else {
-					tp.Flags.Set(IsHaste)
+					tp.Flags.Set(Hasted)
 				}
 			} else {
-				if tp.On(IsHaste) {
-					tp.Flags.Clear(IsHaste)
+				if tp.On(Hasted) {
+					tp.Flags.Clear(Hasted)
 				} else {
-					tp.Flags.Set(IsSlow)
+					tp.Flags.Set(Slowed)
 				}
 				tp.Turn = true
 			}
@@ -153,19 +153,19 @@ func (g *RogueGame) doZap() {
 			g.Delta.X = x
 			g.runto(g.Delta)
 		}
-	case WsElect, WsFire, WsCold:
+	case WandLightning, WandFire, WandCold:
 		var name string
 		switch obj.Which {
-		case WsElect:
+		case WandLightning:
 			name = "bolt"
-		case WsFire:
+		case WandFire:
 			name = "flame"
 		default:
 			name = "ice"
 		}
 		g.fireBolt(p.Pos, &g.Delta, name)
 		g.Items.Sticks[obj.Which].Know = true
-	case WsNop:
+	case WandNothing:
 	}
 	obj.SetCharges(obj.Charges() - 1)
 }
@@ -176,14 +176,14 @@ func (g *RogueGame) drain() {
 	// First count how many things we need to spread the hit points among
 	var corp *Room
 	if g.Level.Char(p.Pos.Y, p.Pos.X) == Door {
-		corp = &g.Level.Passages[*g.Level.FlagsAt(p.Pos.Y, p.Pos.X)&FPNum]
+		corp = &g.Level.Passages[*g.Level.FlagsAt(p.Pos.Y, p.Pos.X)&FPassNum]
 	}
-	inpass := p.Room.Flags.Has(IsGone)
+	inpass := p.Room.Flags.Has(Gone)
 	var drainee []*Monster
 	for _, mp := range g.Level.Monsters {
 		if mp.Room == p.Room || mp.Room == corp ||
 			(inpass && g.Level.Char(mp.Pos.Y, mp.Pos.X) == Door &&
-				&g.Level.Passages[*g.Level.FlagsAt(mp.Pos.Y, mp.Pos.X)&FPNum] == p.Room) {
+				&g.Level.Passages[*g.Level.FlagsAt(mp.Pos.Y, mp.Pos.X)&FPassNum] == p.Room) {
 			drainee = append(drainee, mp)
 		}
 	}
@@ -212,11 +212,11 @@ func (g *RogueGame) fireBolt(start Coord, dir *Coord, name string) {
 
 	bolt := newObject()
 	bolt.Type = Weapon
-	bolt.Which = Flame
+	bolt.Which = WeaponFlame
 	bolt.HurlDmg = "6x6"
 	bolt.HPlus = 100
 	bolt.DPlus = 0
-	g.Items.Weapons[Flame].Name = name
+	g.Items.Weapons[WeaponFlame].Name = name
 	var dirch byte
 	switch dir.Y + dir.X {
 	case 0:
@@ -329,7 +329,7 @@ func (g *RogueGame) fixStick(cur *Object) {
 	cur.HurlDmg = "1x1"
 
 	switch cur.Which {
-	case WsLight:
+	case WandLight:
 		cur.SetCharges(g.rnd(10) + 10)
 	default:
 		cur.SetCharges(g.rnd(5) + 3)
@@ -339,7 +339,7 @@ func (g *RogueGame) fixStick(cur *Object) {
 // chargeStr returns the charge-count suffix for an identified stick
 // (sticks.c charge_str).
 func chargeStr(g *RogueGame, obj *Object) string {
-	if !obj.Flags.Has(IsKnow) {
+	if !obj.Flags.Has(Known) {
 		return ""
 	}
 	if g.Options.Terse {
diff --git a/game/tables.go b/game/tables.go
index 4f8bd9d..4581ad6 100644
--- a/game/tables.go
+++ b/game/tables.go
@@ -9,7 +9,7 @@ package game
 var initStats = Stats{Str: 16, Exp: 0, Lvl: 1, Arm: 10, HP: 12, Dmg: "1x4", MaxHP: 12}
 
 // aClass is extern.c a_class[]: armor class for each armor type.
-var aClass = [MaxArmors]int{
+var aClass = [NumArmorTypes]int{
 	8, // LEATHER
 	7, // RING_MAIL
 	7, // STUDDED_LEATHER
@@ -28,7 +28,7 @@ var eLevels = []int{
 }
 
 // trName is extern.c tr_name[]: names of the traps.
-var trName = [NTraps]string{
+var trName = [NumTrapTypes]string{
 	"a trapdoor",
 	"an arrow trap",
 	"a sleeping gas trap",
@@ -47,32 +47,32 @@ var invTName = []string{"Overwrite", "Slow", "Clear"}
 // rolled from the level at creation time.
 var monsterTable = [26]MonsterKind{
 	/* Name             CARRY  FLAGS                          str exp  lvl arm hp  dmg */
-	{"aquator", 0, IsMean, Stats{10, 20, 5, 2, 1, "0x0/0x0", 0}},
-	{"bat", 0, IsFly, Stats{10, 1, 1, 3, 1, "1x2", 0}},
+	{"aquator", 0, Mean, Stats{10, 20, 5, 2, 1, "0x0/0x0", 0}},
+	{"bat", 0, Flying, Stats{10, 1, 1, 3, 1, "1x2", 0}},
 	{"centaur", 15, 0, Stats{10, 17, 4, 4, 1, "1x2/1x5/1x5", 0}},
-	{"dragon", 100, IsMean, Stats{10, 5000, 10, -1, 1, "1x8/1x8/3x10", 0}},
-	{"emu", 0, IsMean, Stats{10, 2, 1, 7, 1, "1x2", 0}},
-	{"venus flytrap", 0, IsMean, Stats{10, 80, 8, 3, 1, "%%%x0", 0}},
-	{"griffin", 20, IsMean | IsFly | IsRegen, Stats{10, 2000, 13, 2, 1, "4x3/3x5", 0}},
-	{"hobgoblin", 0, IsMean, Stats{10, 3, 1, 5, 1, "1x8", 0}},
+	{"dragon", 100, Mean, Stats{10, 5000, 10, -1, 1, "1x8/1x8/3x10", 0}},
+	{"emu", 0, Mean, Stats{10, 2, 1, 7, 1, "1x2", 0}},
+	{"venus flytrap", 0, Mean, Stats{10, 80, 8, 3, 1, "%%%x0", 0}},
+	{"griffin", 20, Mean | Flying | Regenerates, Stats{10, 2000, 13, 2, 1, "4x3/3x5", 0}},
+	{"hobgoblin", 0, Mean, Stats{10, 3, 1, 5, 1, "1x8", 0}},
 	{"ice monster", 0, 0, Stats{10, 5, 1, 9, 1, "0x0", 0}},
 	{"jabberwock", 70, 0, Stats{10, 3000, 15, 6, 1, "2x12/2x4", 0}},
-	{"kestrel", 0, IsMean | IsFly, Stats{10, 1, 1, 7, 1, "1x4", 0}},
+	{"kestrel", 0, Mean | Flying, Stats{10, 1, 1, 7, 1, "1x4", 0}},
 	{"leprechaun", 0, 0, Stats{10, 10, 3, 8, 1, "1x1", 0}},
-	{"medusa", 40, IsMean, Stats{10, 200, 8, 2, 1, "3x4/3x4/2x5", 0}},
+	{"medusa", 40, Mean, Stats{10, 200, 8, 2, 1, "3x4/3x4/2x5", 0}},
 	{"nymph", 100, 0, Stats{10, 37, 3, 9, 1, "0x0", 0}},
-	{"orc", 15, IsGreed, Stats{10, 5, 1, 6, 1, "1x8", 0}},
-	{"phantom", 0, IsInvis, Stats{10, 120, 8, 3, 1, "4x4", 0}},
-	{"quagga", 0, IsMean, Stats{10, 15, 3, 3, 1, "1x5/1x5", 0}},
-	{"rattlesnake", 0, IsMean, Stats{10, 9, 2, 3, 1, "1x6", 0}},
-	{"snake", 0, IsMean, Stats{10, 2, 1, 5, 1, "1x3", 0}},
-	{"troll", 50, IsRegen | IsMean, Stats{10, 120, 6, 4, 1, "1x8/1x8/2x6", 0}},
-	{"black unicorn", 0, IsMean, Stats{10, 190, 7, -2, 1, "1x9/1x9/2x9", 0}},
-	{"vampire", 20, IsRegen | IsMean, Stats{10, 350, 8, 1, 1, "1x10", 0}},
+	{"orc", 15, Greedy, Stats{10, 5, 1, 6, 1, "1x8", 0}},
+	{"phantom", 0, Invisible, Stats{10, 120, 8, 3, 1, "4x4", 0}},
+	{"quagga", 0, Mean, Stats{10, 15, 3, 3, 1, "1x5/1x5", 0}},
+	{"rattlesnake", 0, Mean, Stats{10, 9, 2, 3, 1, "1x6", 0}},
+	{"snake", 0, Mean, Stats{10, 2, 1, 5, 1, "1x3", 0}},
+	{"troll", 50, Regenerates | Mean, Stats{10, 120, 6, 4, 1, "1x8/1x8/2x6", 0}},
+	{"black unicorn", 0, Mean, Stats{10, 190, 7, -2, 1, "1x9/1x9/2x9", 0}},
+	{"vampire", 20, Regenerates | Mean, Stats{10, 350, 8, 1, 1, "1x10", 0}},
 	{"wraith", 0, 0, Stats{10, 55, 5, 4, 1, "1x6", 0}},
 	{"xeroc", 30, 0, Stats{10, 100, 7, 7, 1, "4x4", 0}},
 	{"yeti", 30, 0, Stats{10, 50, 4, 6, 1, "1x6/1x6", 0}},
-	{"zombie", 0, IsMean, Stats{10, 6, 2, 8, 1, "1x8", 0}},
+	{"zombie", 0, Mean, Stats{10, 6, 2, 8, 1, "1x8", 0}},
 }
 
 // Base ObjInfo tables (extern.c). These are templates: NewGame copies them
@@ -88,7 +88,7 @@ var baseThings = [NumThings]ObjInfo{
 	{Prob: 4},  // stick
 }
 
-var baseArmInfo = [MaxArmors]ObjInfo{
+var baseArmInfo = [NumArmorTypes]ObjInfo{
 	{Name: "leather armor", Prob: 20, Worth: 20},
 	{Name: "ring mail", Prob: 15, Worth: 25},
 	{Name: "studded leather armor", Prob: 15, Worth: 20},
@@ -99,7 +99,7 @@ var baseArmInfo = [MaxArmors]ObjInfo{
 	{Name: "plate mail", Prob: 5, Worth: 150},
 }
 
-var basePotInfo = [MaxPotions]ObjInfo{
+var basePotInfo = [NumPotionTypes]ObjInfo{
 	{Name: "confusion", Prob: 7, Worth: 5},
 	{Name: "hallucination", Prob: 8, Worth: 5},
 	{Name: "poison", Prob: 8, Worth: 5},
@@ -116,7 +116,7 @@ var basePotInfo = [MaxPotions]ObjInfo{
 	{Name: "levitation", Prob: 6, Worth: 75},
 }
 
-var baseRingInfo = [MaxRings]ObjInfo{
+var baseRingInfo = [NumRingTypes]ObjInfo{
 	{Name: "protection", Prob: 9, Worth: 400},
 	{Name: "add strength", Prob: 9, Worth: 400},
 	{Name: "sustain strength", Prob: 5, Worth: 280},
@@ -133,7 +133,7 @@ var baseRingInfo = [MaxRings]ObjInfo{
 	{Name: "maintain armor", Prob: 5, Worth: 380},
 }
 
-var baseScrInfo = [MaxScrolls]ObjInfo{
+var baseScrInfo = [NumScrollTypes]ObjInfo{
 	{Name: "monster confusion", Prob: 7, Worth: 140},
 	{Name: "magic mapping", Prob: 4, Worth: 150},
 	{Name: "hold monster", Prob: 2, Worth: 180},
@@ -154,7 +154,7 @@ var baseScrInfo = [MaxScrolls]ObjInfo{
 	{Name: "protect armor", Prob: 2, Worth: 250},
 }
 
-var baseWeapInfo = [MaxWeapons + 1]ObjInfo{
+var baseWeapInfo = [NumWeaponTypes + 1]ObjInfo{
 	{Name: "mace", Prob: 11, Worth: 8},
 	{Name: "long sword", Prob: 11, Worth: 15},
 	{Name: "short bow", Prob: 12, Worth: 15},
@@ -167,7 +167,7 @@ var baseWeapInfo = [MaxWeapons + 1]ObjInfo{
 	{}, // DO NOT REMOVE: fake entry for dragon's breath
 }
 
-var baseWsInfo = [MaxSticks]ObjInfo{
+var baseWsInfo = [NumWandTypes]ObjInfo{
 	{Name: "light", Prob: 12, Worth: 250},
 	{Name: "invisibility", Prob: 6, Worth: 5},
 	{Name: "lightning", Prob: 3, Worth: 330},
diff --git a/game/tables_test.go b/game/tables_test.go
index c290365..0504282 100644
--- a/game/tables_test.go
+++ b/game/tables_test.go
@@ -17,7 +17,7 @@ func TestProbabilitiesSumTo100(t *testing.T) {
 		"scrolls": baseScrInfo[:],
 		"rings":   baseRingInfo[:],
 		"sticks":  baseWsInfo[:],
-		"weapons": baseWeapInfo[:MaxWeapons], // excludes the flame entry
+		"weapons": baseWeapInfo[:NumWeaponTypes], // excludes the flame entry
 		"armor":   baseArmInfo[:],
 	}
 	for name, tab := range tables {
@@ -29,11 +29,11 @@ func TestProbabilitiesSumTo100(t *testing.T) {
 
 func TestInitProbsCumulative(t *testing.T) {
 	g := NewGame(Config{Seed: 1})
-	last := g.Items.Potions[MaxPotions-1].Prob
+	last := g.Items.Potions[NumPotionTypes-1].Prob
 	if last != 100 {
 		t.Errorf("cumulative potion probability ends at %d, want 100", last)
 	}
-	for i := 1; i < MaxPotions; i++ {
+	for i := 1; i < NumPotionTypes; i++ {
 		if g.Items.Potions[i].Prob < g.Items.Potions[i-1].Prob {
 			t.Errorf("potion probs not nondecreasing at %d", i)
 		}
diff --git a/game/things.go b/game/things.go
index a2ab9c6..3fde819 100644
--- a/game/things.go
+++ b/game/things.go
@@ -55,7 +55,7 @@ func (g *RogueGame) invName(obj *Object, drop bool) string {
 		} else {
 			fmt.Fprintf(&pb, "A%s ", vowelstr(sp))
 		}
-		if obj.Flags.Has(IsKnow) {
+		if obj.Flags.Has(Known) {
 			fmt.Fprintf(&pb, "%s %s", num(obj.HPlus, obj.DPlus, Weapon), sp)
 		} else {
 			pb.WriteString(sp)
@@ -68,7 +68,7 @@ func (g *RogueGame) invName(obj *Object, drop bool) string {
 		}
 	case Armor:
 		sp := it.Armors[which].Name
-		if obj.Flags.Has(IsKnow) {
+		if obj.Flags.Has(Known) {
 			fmt.Fprintf(&pb, "%s %s [", num(aClass[which]-obj.Arm, 0, Armor), sp)
 			if !g.Options.Terse {
 				pb.WriteString("protection ")
@@ -151,7 +151,7 @@ func (g *RogueGame) dropCheck(obj *Object) bool {
 		obj != p.CurRing[Left] && obj != p.CurRing[Right] {
 		return true
 	}
-	if obj.Flags.Has(IsCursed) {
+	if obj.Flags.Has(Cursed) {
 		g.msg("you can't.  It appears to be cursed")
 		return false
 	}
@@ -167,9 +167,9 @@ func (g *RogueGame) dropCheck(obj *Object) bool {
 		}
 		p.CurRing[hand] = nil
 		switch obj.Which {
-		case RAddStr:
+		case RingAddStrength:
 			g.chgStr(-obj.Arm)
-		case RSeeInvis:
+		case RingSeeInvisible:
 			g.unsee(0)
 			g.Extinguish(DUnsee)
 		}
@@ -209,9 +209,9 @@ func (g *RogueGame) newThing() *Object {
 			cur.Which = 1
 		}
 	case 3:
-		g.initWeapon(cur, pickOne(g, g.Items.Weapons[:MaxWeapons]))
+		g.initWeapon(cur, pickOne(g, g.Items.Weapons[:NumWeaponTypes]))
 		if r := g.rnd(100); r < 10 {
-			cur.Flags.Set(IsCursed)
+			cur.Flags.Set(Cursed)
 			cur.HPlus -= g.rnd(3) + 1
 		} else if r < 15 {
 			cur.HPlus += g.rnd(3) + 1
@@ -221,7 +221,7 @@ func (g *RogueGame) newThing() *Object {
 		cur.Which = pickOne(g, g.Items.Armors[:])
 		cur.Arm = aClass[cur.Which]
 		if r := g.rnd(100); r < 20 {
-			cur.Flags.Set(IsCursed)
+			cur.Flags.Set(Cursed)
 			cur.Arm += g.rnd(3) + 1
 		} else if r < 28 {
 			cur.Arm -= g.rnd(3) + 1
@@ -230,13 +230,13 @@ func (g *RogueGame) newThing() *Object {
 		cur.Type = Ring
 		cur.Which = pickOne(g, g.Items.Rings[:])
 		switch cur.Which {
-		case RAddStr, RProtect, RAddHit, RAddDam:
+		case RingAddStrength, RingProtection, RingDexterity, RingIncreaseDamage:
 			if cur.Arm = g.rnd(3); cur.Arm == 0 {
 				cur.Arm = -1
-				cur.Flags.Set(IsCursed)
+				cur.Flags.Set(Cursed)
 			}
-		case RAggr, RTeleport:
-			cur.Flags.Set(IsCursed)
+		case RingAggravateMonsters, RingTeleportation:
+			cur.Flags.Set(Cursed)
 		}
 	case 6:
 		cur.Type = Stick
@@ -525,7 +525,7 @@ func (g *RogueGame) prList() {
 	case Armor:
 		g.prSpec(g.Items.Armors[:])
 	case Weapon:
-		g.prSpec(g.Items.Weapons[:MaxWeapons])
+		g.prSpec(g.Items.Weapons[:NumWeaponTypes])
 	}
 }
 
diff --git a/game/types.go b/game/types.go
index ab25be8..cd5170b 100644
--- a/game/types.go
+++ b/game/types.go
@@ -100,9 +100,9 @@ const (
 type RoomFlags int16
 
 const (
-	IsDark RoomFlags = 1 << iota // room is dark
-	IsGone                       // room is gone (a corridor)
-	IsMaze                       // room is a maze
+	Dark RoomFlags = 1 << iota // room is dark
+	Gone                       // room is gone (a corridor)
+	Maze                       // room is a maze
 )
 
 func (f RoomFlags) Has(b RoomFlags) bool { return f&b != 0 }
@@ -113,12 +113,12 @@ func (f *RoomFlags) Clear(b RoomFlags)   { *f &^= b }
 type ObjFlags int32
 
 const (
-	IsCursed   ObjFlags = 1 << iota // object is cursed
-	IsKnow                          // player knows details about the object
-	IsMissl                         // object is a missile type
-	IsMany                          // object comes in groups
-	ObjIsFound                      // object has been seen (ISFOUND shares the bit with creatures)
-	IsProt                          // armor is permanently protected
+	Cursed    ObjFlags = 1 << iota // ISCURSED: object is cursed
+	Known                          // ISKNOW: player knows details about the object
+	Missile                        // ISMISL: object is a missile type
+	Stackable                      // ISMANY: object comes in groups
+	WasFound                       // ISFOUND (objects): object has been seen (ISFOUND shares the bit with creatures)
+	Protected                      // ISPROT: armor is permanently protected
 )
 
 func (f ObjFlags) Has(b ObjFlags) bool { return f&b != 0 }
@@ -131,25 +131,25 @@ func (f *ObjFlags) Clear(b ObjFlags)   { *f &^= b }
 type CreatureFlags int32
 
 const (
-	CanHuh   CreatureFlags = 0o000001 // creature can confuse
-	CanSee   CreatureFlags = 0o000002 // creature can see invisible creatures
-	IsBlind  CreatureFlags = 0o000004 // creature is blind
-	IsCanc   CreatureFlags = 0o000010 // creature has special qualities cancelled
-	IsLevit  CreatureFlags = 0o000010 // hero is levitating
-	IsFound  CreatureFlags = 0o000020 // creature has been seen
-	IsGreed  CreatureFlags = 0o000040 // creature runs to protect gold
-	IsHaste  CreatureFlags = 0o000100 // creature has been hastened
-	IsTarget CreatureFlags = 0o000200 // creature is the target of an 'f' command
-	IsHeld   CreatureFlags = 0o000400 // creature has been held
-	IsHuh    CreatureFlags = 0o001000 // creature is confused
-	IsInvis  CreatureFlags = 0o002000 // creature is invisible
-	IsMean   CreatureFlags = 0o004000 // creature can wake when player enters room
-	IsHalu   CreatureFlags = 0o004000 // hero is on acid trip
-	IsRegen  CreatureFlags = 0o010000 // creature can regenerate
-	IsRun    CreatureFlags = 0o020000 // creature is running at the player
-	SeeMonst CreatureFlags = 0o040000 // hero can detect unseen monsters
-	IsFly    CreatureFlags = 0o040000 // creature can fly
-	IsSlow   CreatureFlags = 0o100000 // creature has been slowed
+	CanConfuse      CreatureFlags = 0o000001 // CANHUH: creature can confuse
+	CanSeeInvisible CreatureFlags = 0o000002 // CANSEE: creature can see invisible creatures
+	Blind           CreatureFlags = 0o000004 // ISBLIND: creature is blind
+	Cancelled       CreatureFlags = 0o000010 // ISCANC: creature has special qualities cancelled
+	Levitating      CreatureFlags = 0o000010 // ISLEVIT: hero is levitating
+	Found           CreatureFlags = 0o000020 // ISFOUND: creature has been seen
+	Greedy          CreatureFlags = 0o000040 // ISGREED: creature runs to protect gold
+	Hasted          CreatureFlags = 0o000100 // ISHASTE: creature has been hastened
+	Targeted        CreatureFlags = 0o000200 // ISTARGET: creature is the target of an 'f' command
+	Held            CreatureFlags = 0o000400 // ISHELD: creature has been held
+	Confused        CreatureFlags = 0o001000 // ISHUH: creature is confused
+	Invisible       CreatureFlags = 0o002000 // ISINVIS: creature is invisible
+	Mean            CreatureFlags = 0o004000 // ISMEAN: creature can wake when player enters room
+	Hallucinating   CreatureFlags = 0o004000 // ISHALU: hero is on acid trip
+	Regenerates     CreatureFlags = 0o010000 // ISREGEN: creature can regenerate
+	Awake           CreatureFlags = 0o020000 // ISRUN: creature is running at the player
+	SenseMonsters   CreatureFlags = 0o040000 // SEEMONST: hero can detect unseen monsters
+	Flying          CreatureFlags = 0o040000 // ISFLY: creature can fly
+	Slowed          CreatureFlags = 0o100000 // ISSLOW: creature has been slowed
 )
 
 func (f CreatureFlags) Has(b CreatureFlags) bool { return f&b != 0 }
@@ -160,13 +160,13 @@ func (f *CreatureFlags) Clear(b CreatureFlags)   { *f &^= b }
 type PlaceFlags uint8
 
 const (
-	FPass    PlaceFlags = 0x80 // is a passageway
-	FSeen    PlaceFlags = 0x40 // have seen this spot before
-	FDropped PlaceFlags = 0x20 // object was dropped here
-	FLocked  PlaceFlags = 0x20 // door is locked
-	FReal    PlaceFlags = 0x10 // what you see is what you get
-	FPNum    PlaceFlags = 0x0f // passage number mask
-	FTMask   PlaceFlags = 0x07 // trap number mask
+	FPassage  PlaceFlags = 0x80 // F_PASS: is a passageway
+	FSeen     PlaceFlags = 0x40 // have seen this spot before
+	FDropped  PlaceFlags = 0x20 // object was dropped here
+	FLocked   PlaceFlags = 0x20 // door is locked
+	FReal     PlaceFlags = 0x10 // what you see is what you get
+	FPassNum  PlaceFlags = 0x0f // F_PNUM: passage number mask
+	FTrapMask PlaceFlags = 0x07 // F_TMASK: trap number mask
 )
 
 func (f PlaceFlags) Has(b PlaceFlags) bool { return f&b != 0 }
@@ -175,123 +175,123 @@ func (f *PlaceFlags) Clear(b PlaceFlags)   { *f &^= b }
 
 // Trap types (rogue.h)
 const (
-	TDoor  = 0
-	TArrow = 1
-	TSleep = 2
-	TBear  = 3
-	TTelep = 4
-	TDart  = 5
-	TRust  = 6
-	TMyst  = 7
-	NTraps = 8
+	TrapDoor     = 0
+	TrapArrow    = 1
+	TrapSleep    = 2
+	TrapBear     = 3
+	TrapTeleport = 4
+	TrapDart     = 5
+	TrapRust     = 6
+	TrapMystery  = 7
+	NumTrapTypes = 8
 )
 
 // Potion types (rogue.h)
 const (
-	PConfuse = iota
-	PLSD
-	PPoison
-	PStrength
-	PSeeInvis
-	PHealing
-	PMFind
-	PTFind
-	PRaise
-	PXHeal
-	PHaste
-	PRestore
-	PBlind
-	PLevit
-	MaxPotions
+	PotionConfusion = iota
+	PotionLSD
+	PotionPoison
+	PotionGainStrength
+	PotionSeeInvisible
+	PotionHealing
+	PotionDetectMonsters
+	PotionDetectMagic
+	PotionRaiseLevel
+	PotionExtraHealing
+	PotionHaste
+	PotionRestoreStrength
+	PotionBlindness
+	PotionLevitation
+	NumPotionTypes
 )
 
 // Scroll types (rogue.h)
 const (
-	SConfuse = iota
-	SMap
-	SHold
-	SSleep
-	SArmor
-	SIDPotion
-	SIDScroll
-	SIDWeapon
-	SIDArmor
-	SIDRorS
-	SScare
-	SFDet
-	STelep
-	SEnch
-	SCreate
-	SRemove
-	SAggr
-	SProtect
-	MaxScrolls
+	ScrollMonsterConfusion = iota
+	ScrollMagicMapping
+	ScrollHoldMonster
+	ScrollSleep
+	ScrollEnchantArmor
+	ScrollIdentifyPotion
+	ScrollIdentifyScroll
+	ScrollIdentifyWeapon
+	ScrollIdentifyArmor
+	ScrollIdentifyRingOrStick
+	ScrollScareMonster
+	ScrollFoodDetection
+	ScrollTeleportation
+	ScrollEnchantWeapon
+	ScrollCreateMonster
+	ScrollRemoveCurse
+	ScrollAggravateMonsters
+	ScrollProtectArmor
+	NumScrollTypes
 )
 
 // Weapon types (rogue.h)
 const (
-	Mace = iota
-	Sword
-	Bow
-	Arrow
-	Dagger
-	TwoSword
-	Dart
-	Shiraken
-	Spear
-	Flame      // fake entry for dragon breath (ick)
-	MaxWeapons = Flame
+	WeaponMace = iota
+	WeaponLongSword
+	WeaponBow
+	WeaponArrow
+	WeaponDagger
+	WeaponTwoHandedSword
+	WeaponDart
+	WeaponShuriken
+	WeaponSpear
+	WeaponFlame    // fake entry for dragon breath (ick)
+	NumWeaponTypes = WeaponFlame
 )
 
 // Armor types (rogue.h)
 const (
-	Leather = iota
-	RingMail
-	StuddedLeather
-	ScaleMail
-	ChainMail
-	SplintMail
-	BandedMail
-	PlateMail
-	MaxArmors
+	ArmorLeather = iota
+	ArmorRingMail
+	ArmorStuddedLeather
+	ArmorScaleMail
+	ArmorChainMail
+	ArmorSplintMail
+	ArmorBandedMail
+	ArmorPlateMail
+	NumArmorTypes
 )
 
 // Ring types (rogue.h)
 const (
-	RProtect = iota
-	RAddStr
-	RSustStr
-	RSearch
-	RSeeInvis
-	RNop
-	RAggr
-	RAddHit
-	RAddDam
-	RRegen
-	RDigest
-	RTeleport
-	RStealth
-	RSustArm
-	MaxRings
+	RingProtection = iota
+	RingAddStrength
+	RingSustainStrength
+	RingSearching
+	RingSeeInvisible
+	RingAdornment
+	RingAggravateMonsters
+	RingDexterity
+	RingIncreaseDamage
+	RingRegeneration
+	RingSlowDigestion
+	RingTeleportation
+	RingStealth
+	RingMaintainArmor
+	NumRingTypes
 )
 
 // Rod/Wand/Staff types (rogue.h)
 const (
-	WsLight = iota
-	WsInvis
-	WsElect
-	WsFire
-	WsCold
-	WsPolymorph
-	WsMissile
-	WsHasteM
-	WsSlowM
-	WsDrain
-	WsNop
-	WsTelAway
-	WsTelTo
-	WsCancel
-	MaxSticks
+	WandLight = iota
+	WandInvisibility
+	WandLightning
+	WandFire
+	WandCold
+	WandPolymorph
+	WandMagicMissile
+	WandHasteMonster
+	WandSlowMonster
+	WandDrainLife
+	WandNothing
+	WandTeleportAway
+	WandTeleportTo
+	WandCancellation
+	NumWandTypes
 )
 
 // Coord is a position on the level (rogue.h coord). A value type: the C
diff --git a/game/weapons.go b/game/weapons.go
index 469c902..b9f7be8 100644
--- a/game/weapons.go
+++ b/game/weapons.go
@@ -122,21 +122,21 @@ func (g *RogueGame) wield() {
 }
 
 // initWeaps is the weapons.c init_dam[] table.
-var initWeaps = [MaxWeapons]struct {
+var initWeaps = [NumWeaponTypes]struct {
 	dam    string // damage when wielded
 	hrl    string // damage when thrown
 	launch int    // launching weapon
 	flags  ObjFlags
 }{
-	{"2x4", "1x3", noWeapon, 0},                // Mace
-	{"3x4", "1x2", noWeapon, 0},                // Long sword
-	{"1x1", "1x1", noWeapon, 0},                // Bow
-	{"1x1", "2x3", Bow, IsMany | IsMissl},      // Arrow
-	{"1x6", "1x4", noWeapon, IsMissl},          // Dagger
-	{"4x4", "1x2", noWeapon, 0},                // 2h sword
-	{"1x1", "1x3", noWeapon, IsMany | IsMissl}, // Dart
-	{"1x2", "2x4", noWeapon, IsMany | IsMissl}, // Shuriken
-	{"2x3", "1x6", noWeapon, IsMissl},          // Spear
+	{"2x4", "1x3", noWeapon, 0},                    // WeaponMace
+	{"3x4", "1x2", noWeapon, 0},                    // Long sword
+	{"1x1", "1x1", noWeapon, 0},                    // WeaponBow
+	{"1x1", "2x3", WeaponBow, Stackable | Missile}, // WeaponArrow
+	{"1x6", "1x4", noWeapon, Missile},              // WeaponDagger
+	{"4x4", "1x2", noWeapon, 0},                    // 2h sword
+	{"1x1", "1x3", noWeapon, Stackable | Missile},  // WeaponDart
+	{"1x2", "2x4", noWeapon, Stackable | Missile},  // Shuriken
+	{"2x3", "1x6", noWeapon, Missile},              // WeaponSpear
 }
 
 // initWeapon sets up a new weapon (weapons.c init_weapon).
@@ -150,11 +150,11 @@ func (g *RogueGame) initWeapon(weap *Object, which int) {
 	weap.Flags = iwp.flags
 	weap.HPlus = 0
 	weap.DPlus = 0
-	if which == Dagger {
+	if which == WeaponDagger {
 		weap.Count = g.rnd(4) + 2
 		weap.Group = g.Items.Group
 		g.Items.Group++
-	} else if weap.Flags.Has(IsMany) {
+	} else if weap.Flags.Has(Stackable) {
 		weap.Count = g.rnd(8) + 8
 		weap.Group = g.Items.Group
 		g.Items.Group++
diff --git a/game/wizard.go b/game/wizard.go
index d47f3ad..7bc6287 100644
--- a/game/wizard.go
+++ b/game/wizard.go
@@ -27,7 +27,7 @@ func (g *RogueGame) createObj() {
 		bless := g.readchar()
 		g.Msgs.Mpos = 0
 		if bless == '-' {
-			obj.Flags.Set(IsCursed)
+			obj.Flags.Set(Cursed)
 		}
 		if obj.Type == Weapon {
 			g.initWeapon(obj, obj.Which)
@@ -48,18 +48,18 @@ func (g *RogueGame) createObj() {
 		}
 	case obj.Type == Ring:
 		switch obj.Which {
-		case RProtect, RAddStr, RAddHit, RAddDam:
+		case RingProtection, RingAddStrength, RingDexterity, RingIncreaseDamage:
 			g.msg("blessing? (+,-,n)")
 			bless := g.readchar()
 			g.Msgs.Mpos = 0
 			if bless == '-' {
-				obj.Flags.Set(IsCursed)
+				obj.Flags.Set(Cursed)
 				obj.Arm = -1
 			} else {
 				obj.Arm = g.rnd(2) + 1
 			}
-		case RAggr, RTeleport:
-			obj.Flags.Set(IsCursed)
+		case RingAggravateMonsters, RingTeleportation:
+			obj.Flags.Set(Cursed)
 		}
 	case obj.Type == Stick:
 		g.fixStick(obj)
@@ -131,7 +131,7 @@ func (g *RogueGame) whatis(insist bool, typ int) {
 	case Stick:
 		setKnow(obj, g.Items.Sticks[:])
 	case Weapon, Armor:
-		obj.Flags.Set(IsKnow)
+		obj.Flags.Set(Known)
 	case Ring:
 		setKnow(obj, g.Items.Rings[:])
 	}
@@ -142,7 +142,7 @@ func (g *RogueGame) whatis(insist bool, typ int) {
 // set_know).
 func setKnow(obj *Object, info []ObjInfo) {
 	info[obj.Which].Know = true
-	obj.Flags.Set(IsKnow)
+	obj.Flags.Set(Known)
 	info[obj.Which].Guess = ""
 }
 
@@ -187,8 +187,8 @@ func (g *RogueGame) teleport() {
 	g.mvaddch(p.Pos.Y, p.Pos.X, PlayerCh)
 	// turn off ISHELD in case teleportation was done while fighting a
 	// Flytrap
-	if p.On(IsHeld) {
-		p.Flags.Clear(IsHeld)
+	if p.On(Held) {
+		p.Flags.Clear(Held)
 		p.VfHit = 0
 		g.Monsters['F'-'A'].Stats.Dmg = "000x0"
 	}