diff --git a/assets/creeps/ghost/ghost1.png b/assets/creeps/ghost/ghost1.png
new file mode 100644
index 0000000..456da04
Binary files /dev/null and b/assets/creeps/ghost/ghost1.png differ
diff --git a/assets/creeps/ghost/ghost1r.png b/assets/creeps/ghost/ghost1r.png
new file mode 100644
index 0000000..4d01379
Binary files /dev/null and b/assets/creeps/ghost/ghost1r.png differ
diff --git a/assets/creeps/ghost/ghost2.png b/assets/creeps/ghost/ghost2.png
new file mode 100644
index 0000000..c0272dd
Binary files /dev/null and b/assets/creeps/ghost/ghost2.png differ
diff --git a/assets/creeps/ghost/ghost2r.png b/assets/creeps/ghost/ghost2r.png
new file mode 100644
index 0000000..b6f5c6f
Binary files /dev/null and b/assets/creeps/ghost/ghost2r.png differ
diff --git a/assets/ojas-dungeon/character_run.png b/assets/ojas-dungeon/character_run.png
index 73edf3d..1ca9b11 100644
Binary files a/assets/ojas-dungeon/character_run.png and b/assets/ojas-dungeon/character_run.png differ
diff --git a/assets/sandstone-dungeon/Tiles-Props-pack.png b/assets/sandstone-dungeon/Tiles-Props-pack.png
index 0203578..fb2b338 100644
Binary files a/assets/sandstone-dungeon/Tiles-Props-pack.png and b/assets/sandstone-dungeon/Tiles-Props-pack.png differ
diff --git a/creep.go b/creep.go
index d7f34fd..5522ebb 100644
--- a/creep.go
+++ b/creep.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"log"
 	"math"
 	"math/rand"
 	"sync"
@@ -13,6 +14,7 @@ const (
 	TypeVampire = iota
 	TypeBat
 	TypeGhost
+	TypeTorch
 )
 
 type gameCreep struct {
@@ -36,9 +38,64 @@ type gameCreep struct {
 
 	health int
 
+	angle float64
+
 	sync.Mutex
 }
 
+func newCreep(creepType int, l *Level, p *gamePlayer) *gameCreep {
+	sprites := []*ebiten.Image{
+		imageAtlas[ImageVampire1],
+		imageAtlas[ImageVampire2],
+		imageAtlas[ImageVampire3],
+		imageAtlas[ImageVampire2],
+	}
+	if creepType == TypeBat {
+		sprites = []*ebiten.Image{
+			batSS.Frame1,
+			batSS.Frame2,
+			batSS.Frame3,
+			batSS.Frame4,
+			batSS.Frame5,
+			batSS.Frame6,
+			batSS.Frame7,
+		}
+	} else if creepType == TypeGhost {
+		sprites = []*ebiten.Image{
+			imageAtlas[ImageGhost1],
+		}
+	} else if creepType == TypeTorch {
+		sprites = []*ebiten.Image{
+			sandstoneSS.TorchTop1,
+			sandstoneSS.TorchTop2,
+			sandstoneSS.TorchTop3,
+			sandstoneSS.TorchTop4,
+			sandstoneSS.TorchTop5,
+			sandstoneSS.TorchTop6,
+			sandstoneSS.TorchTop7,
+			sandstoneSS.TorchTop8,
+		}
+	}
+
+	startingFrame := 0
+	if len(sprites) > 1 {
+		startingFrame = rand.Intn(len(sprites))
+	}
+
+	x, y := l.newSpawnLocation()
+	return &gameCreep{
+		creepType: creepType,
+		x:         x,
+		y:         y,
+		sprites:   sprites,
+		frames:    len(sprites),
+		frame:     startingFrame,
+		level:     l,
+		player:    p,
+		health:    1,
+	}
+}
+
 func (c *gameCreep) queueNextAction() {
 	if c.creepType == TypeBat {
 		c.nextAction = 288 + rand.Intn(288)
@@ -100,6 +157,22 @@ func (c *gameCreep) doNextAction() {
 	randMovementA := (rand.Float64() - 0.5) / 12
 	randMovementB := (rand.Float64() - 0.5) / 12
 
+	if c.creepType == TypeGhost {
+		c.angle = angle(c.x, c.y, c.player.x, c.player.y)
+
+		// TODO optimize
+		if c.angle > math.Pi/2 || c.angle < -1*math.Pi/2 {
+			c.sprites = []*ebiten.Image{
+				imageAtlas[ImageGhost1R],
+			}
+			c.angle = c.angle - math.Pi
+		} else {
+			c.sprites = []*ebiten.Image{
+				imageAtlas[ImageGhost1],
+			}
+		}
+	}
+
 	repelled := c.repelled()
 	if !repelled && rand.Intn(13) == 0 {
 		c.seekPlayer()
@@ -125,6 +198,54 @@ func (c *gameCreep) repelled() bool {
 	return repelled
 }
 
+// TODO return true when creep is facing player and player is facing creep
+func (c *gameCreep) facingPlayer() bool {
+	mod := func(v float64) float64 {
+		for v > math.Pi {
+			v -= math.Pi
+		}
+		for v < math.Pi*-1 {
+			v += math.Pi
+		}
+		return v
+	}
+	_ = mod
+
+	ca := math.Remainder(c.angle, math.Pi)
+	ca = math.Remainder(ca, -math.Pi)
+	if ca < 0 {
+		ca = math.Pi + ca
+	}
+	ca = c.angle
+	if ca < 0 {
+		ca = math.Pi*2 + ca
+	}
+	pa := math.Remainder(c.player.angle, math.Pi)
+	pa = math.Remainder(pa, -math.Pi)
+	if pa < 0 {
+		pa = math.Pi + pa
+	}
+	pa = c.player.angle
+	if pa < 0 {
+		pa = math.Pi*2 + pa
+	}
+
+	a := ca - pa
+	if pa > ca {
+		a = pa - ca
+	}
+
+	if rand.Intn(70) == 0 {
+		// TODO
+		log.Println(ca, pa, a)
+	}
+
+	return a < 2
+	//a2 := c.player.angle - c.angle
+	// TODO
+	//return a > math.Pi/2*-1 && a2 > math.Pi/2*-1 && a < math.Pi/2 && a2 < math.Pi/2
+}
+
 func (c *gameCreep) Update() {
 	c.Lock()
 	defer c.Unlock()
@@ -133,10 +254,18 @@ func (c *gameCreep) Update() {
 		return
 	}
 
+	if c.creepType == TypeTorch {
+		return
+	}
+
 	c.tick++
 
 	repelled := c.repelled()
 
+	if c.creepType == TypeGhost && c.facingPlayer() {
+		return
+	}
+
 	dx, dy := deltaXY(c.x, c.y, c.player.x, c.player.y)
 	seekDistance := 2.0
 	if !repelled && dx < seekDistance && dy < seekDistance {
@@ -191,7 +320,7 @@ func (c *gameCreep) killScore() int {
 	case TypeBat:
 		return 125
 	case TypeGhost:
-		return 75
+		return 150
 	default:
 		return 0
 	}
diff --git a/game.go b/game.go
index ad15c91..34bd53f 100644
--- a/game.go
+++ b/game.go
@@ -94,10 +94,6 @@ type game struct {
 
 	projectiles []*projectile
 
-	batSS *BatSpriteSheet
-
-	ojasSS *PlayerSpriteSheet
-
 	overlayImg *ebiten.Image
 	op         *ebiten.DrawImageOptions
 
@@ -160,6 +156,8 @@ func NewGame() (*game, error) {
 }
 
 func (g *game) flashMessage(message string) {
+	log.Println(message)
+
 	g.flashMessageText = message
 	g.flashMessageUntil = time.Now().Add(3 * time.Second)
 }
@@ -167,12 +165,12 @@ func (g *game) flashMessage(message string) {
 func (g *game) loadAssets() error {
 	var err error
 	// Load SpriteSheets.
-	g.ojasSS, err = LoadPlayerSpriteSheet()
+	ojasSS, err = LoadPlayerSpriteSheet()
 	if err != nil {
 		return fmt.Errorf("failed to load embedded spritesheet: %s", err)
 	}
 
-	g.batSS, err = LoadBatSpriteSheet()
+	batSS, err = LoadBatSpriteSheet()
 	if err != nil {
 		return fmt.Errorf("failed to load embedded spritesheet: %s", err)
 	}
@@ -199,44 +197,6 @@ func (g *game) newItem(itemType int) *gameItem {
 	}
 }
 
-func (g *game) newCreep(creepType int) *gameCreep {
-	sprites := []*ebiten.Image{
-		imageAtlas[ImageVampire1],
-		imageAtlas[ImageVampire2],
-		imageAtlas[ImageVampire3],
-		imageAtlas[ImageVampire2],
-	}
-	if creepType == TypeBat {
-		sprites = []*ebiten.Image{
-			g.batSS.Frame1,
-			g.batSS.Frame2,
-			g.batSS.Frame3,
-			g.batSS.Frame4,
-			g.batSS.Frame5,
-			g.batSS.Frame6,
-			g.batSS.Frame7,
-		}
-	}
-
-	startingFrame := 0
-	if len(sprites) > 1 {
-		startingFrame = rand.Intn(len(sprites))
-	}
-
-	x, y := g.level.newSpawnLocation()
-	return &gameCreep{
-		creepType: creepType,
-		x:         x,
-		y:         y,
-		sprites:   sprites,
-		frames:    len(sprites),
-		frame:     startingFrame,
-		level:     g.level,
-		player:    g.player,
-		health:    1,
-	}
-}
-
 func (g *game) nextLevel() error {
 	g.levelNum++
 	if g.levelNum > 13 {
@@ -255,11 +215,10 @@ func (g *game) generateLevel() error {
 	}
 
 	var err error
-	g.level, err = NewLevel(g.levelNum)
+	g.level, err = NewLevel(g.levelNum, g.player)
 	if err != nil {
 		return fmt.Errorf("failed to create new level: %s", err)
 	}
-	g.level.player = g.player
 
 	// Position player.
 	for {
@@ -273,20 +232,10 @@ func (g *game) generateLevel() error {
 
 	// Spawn items.
 	g.level.items = nil
-	added := make(map[string]bool)
 	for i := 0; i < spawnGarlic; i++ {
 		itemType := itemTypeGarlic
 		c := g.newItem(itemType)
-
-		addedItem := fmt.Sprintf("%0.0f-%0.0f", c.x, c.y)
-		if added[addedItem] {
-			// Already added a gameItem here.
-			i--
-			continue
-		}
-
 		g.level.items = append(g.level.items, c)
-		added[addedItem] = true
 	}
 	// Spawn starting garlic.
 	item := g.newItem(itemTypeGarlic)
@@ -305,20 +254,8 @@ func (g *game) generateLevel() error {
 	g.level.items = append(g.level.items, item)
 
 	// Spawn creeps.
-	g.level.creeps = make([]*gameCreep, spawnVampire)
 	for i := 0; i < spawnVampire; i++ {
-		creepType := TypeVampire
-		c := g.newCreep(creepType)
-
-		addedCreep := fmt.Sprintf("%0.0f-%0.0f", c.x, c.y)
-		if added[addedCreep] {
-			// Already added a gameCreep here.
-			i--
-			continue
-		}
-
-		g.level.creeps[i] = c
-		added[addedCreep] = true
+		g.level.addCreep(TypeVampire)
 	}
 	return nil
 }
@@ -434,6 +371,11 @@ func (g *game) Update() error {
 
 		c.Update()
 
+		if c.creepType == TypeTorch {
+			continue
+		}
+
+		// TODO can this move into creep?
 		cx, cy := c.Position()
 		dx, dy := deltaXY(g.player.x, g.player.y, cx, cy)
 		if dx <= biteThreshold && dy <= biteThreshold {
@@ -565,7 +507,7 @@ func (g *game) Update() error {
 		dx, dy := deltaXY(g.player.x, g.player.y, item.x, item.y)
 		if dx <= 1 && dy <= 1 {
 			item.health = 0
-			g.player.score += item.useScore()
+			g.player.score += item.useScore() * g.levelNum
 
 			if item.itemType == itemTypeGarlic {
 				g.playSound(SoundMunch, munchVolume)
@@ -613,9 +555,14 @@ UPDATEPROJECTILES:
 				continue
 			}
 
+			threshold := bulletHitThreshold
+			if c.creepType == TypeTorch {
+				threshold = 1
+			}
+
 			cx, cy := c.Position()
 			dx, dy := deltaXY(p.x, p.y, cx, cy)
-			if dx > bulletHitThreshold || dy > bulletHitThreshold {
+			if dx > threshold || dy > threshold {
 				continue
 			}
 
@@ -663,7 +610,7 @@ UPDATEPROJECTILES:
 	if g.tick%200 == 0 {
 		removed = 0
 		for i, creep := range g.level.creeps {
-			if creep.health != 0 {
+			if creep.health != 0 || creep.creepType == TypeTorch {
 				continue
 			}
 
@@ -679,7 +626,7 @@ UPDATEPROJECTILES:
 		g.level.items = append(g.level.items, item)
 
 		if g.debugMode {
-			log.Println("SPAWN GARLIC")
+			g.flashMessage("SPAWN GARLIC")
 		}
 	}
 
@@ -689,7 +636,7 @@ UPDATEPROJECTILES:
 		g.level.items = append(g.level.items, item)
 
 		if g.debugMode {
-			log.Println("SPAWN HOLY WATER")
+			g.flashMessage("SPAWN HOLY WATER")
 		}
 	}
 
@@ -701,13 +648,10 @@ UPDATEPROJECTILES:
 				spawnAmount *= 4
 			}
 			if g.debugMode && spawnAmount > 0 {
-				log.Printf("SPAWN %d VAMPIRES", spawnAmount)
+				g.flashMessage(fmt.Sprintf("SPAWN %d VAMPIRES", spawnAmount))
 			}
 			for i := 0; i < spawnAmount; i++ {
-				creepType := TypeVampire
-				c := g.newCreep(creepType)
-
-				g.level.creeps = append(g.level.creeps, c)
+				g.level.addCreep(TypeVampire)
 			}
 		}
 
@@ -721,13 +665,27 @@ UPDATEPROJECTILES:
 			}
 			spawnAmount = rand.Intn(spawnAmount)
 			if g.debugMode && spawnAmount > 0 {
-				log.Printf("SPAWN %d BATS", spawnAmount)
+				g.flashMessage(fmt.Sprintf("SPAWN %d BATS", spawnAmount))
 			}
 			for i := 0; i < spawnAmount; i++ {
-				creepType := TypeBat
-				c := g.newCreep(creepType)
+				g.level.addCreep(TypeBat)
+			}
+		}
 
-				g.level.creeps = append(g.level.creeps, c)
+		// Spawn ghosts.
+		if g.tick%1872 == 0 {
+			spawnAmount := g.tick / 1872
+			if spawnAmount < 1 {
+				spawnAmount = 1
+			} else if spawnAmount > 6 {
+				spawnAmount = 6
+			}
+			spawnAmount = rand.Intn(spawnAmount)
+			if g.debugMode && spawnAmount > 0 {
+				g.flashMessage(fmt.Sprintf("SPAWN %d GHOSTS", spawnAmount))
+			}
+			for i := 0; i < spawnAmount; i++ {
+				g.level.addCreep(TypeGhost)
 			}
 		}
 	}
@@ -752,6 +710,12 @@ UPDATEPROJECTILES:
 		g.player.holyWaters++
 		g.flashMessage("+ HOLY WATER")
 	}
+	if ebiten.IsKeyPressed(ebiten.KeyControl) && inpututil.IsKeyJustPressed(ebiten.Key2) {
+		for i := 0; i < 13; i++ {
+			g.level.addCreep(TypeGhost)
+		}
+		g.flashMessage("+ GHOST")
+	}
 	if ebiten.IsKeyPressed(ebiten.KeyControl) && inpututil.IsKeyJustPressed(ebiten.Key6) {
 		g.fullBrightMode = !g.fullBrightMode
 		if g.fullBrightMode {
@@ -777,7 +741,6 @@ UPDATEPROJECTILES:
 	}
 	if inpututil.IsKeyJustPressed(ebiten.KeyP) {
 		if g.cpuProfile == nil {
-			log.Println("CPU profiling started...")
 			g.flashMessage("CPU PROFILING STARTED")
 
 			homeDir, err := os.UserHomeDir()
@@ -792,7 +755,6 @@ UPDATEPROJECTILES:
 				return err
 			}
 		} else {
-			log.Println("Profiling stopped")
 			g.flashMessage("CPU PROFILING STOPPED")
 
 			pprof.StopCPUProfile()
@@ -899,6 +861,10 @@ func (g *game) tilePosition(x, y float64) (float64, float64) {
 
 // renderSprite renders a sprite on the screen.
 func (g *game) renderSprite(x float64, y float64, offsetx float64, offsety float64, angle float64, scale float64, colorScale float64, alpha float64, sprite *ebiten.Image, target *ebiten.Image) int {
+	if alpha <= .01 || colorScale <= .01 {
+		return 0
+	}
+
 	x, y = g.tilePosition(x, y)
 
 	// Skip drawing off-screen tiles.
@@ -939,27 +905,13 @@ func (g *game) colorScale(x, y float64) float64 {
 		return 1
 	}
 
-	dx, dy := deltaXY(x, y, g.player.x, g.player.y)
+	v := colorScaleValue(x, y, g.player.x, g.player.y)
 
-	sD := 7 / (dx + dy)
-	if sD > 1 {
-		sD = 1
-	}
-
-	sDB := sD
-	if dx > 4 {
-		sDB *= 0.6 / (dx / 4)
-	}
-	if dy > 4 {
-		sDB *= 0.6 / (dy / 4)
-	}
+	tileV := g.level.Tile(int(x), int(y)).colorScale
 
-	sD = sD * 2 * sDB
-	if sD > 1 {
-		sD = 1
-	}
+	s := math.Min(1, v+tileV)
 
-	return sD
+	return s
 }
 
 // renderLevel draws the current Level on the screen.
@@ -989,11 +941,11 @@ func (g *game) renderLevel(screen *ebiten.Image) int {
 	}
 
 	for _, c := range g.level.creeps {
-		if c.health == 0 {
+		if c.health == 0 && c.creepType != TypeTorch {
 			continue
 		}
 
-		drawn += g.renderSprite(c.x, c.y, 0, 0, 0, 1.0, g.colorScale(c.x, c.y), 1.0, c.sprites[c.frame], screen)
+		drawn += g.renderSprite(c.x, c.y, 0, 0, c.angle, 1.0, g.colorScale(c.x, c.y), 1.0, c.sprites[c.frame], screen)
 		if c.frames > 1 && time.Since(c.lastFrame) >= 75*time.Millisecond {
 			c.frame++
 			if c.frame == c.frames {
@@ -1029,17 +981,18 @@ func (g *game) renderLevel(screen *ebiten.Image) int {
 		drawn += g.renderSprite(g.player.x+0.25, g.player.y+0.25, -offset, -offset, 0, scale, 1.0, alpha, imageAtlas[ImageHolyWater], screen)
 	}
 
-	playerSprite := g.ojasSS.Frame1
+	playerSprite := ojasSS.Frame1
 	playerAngle := g.player.angle
 	weaponSprite := g.player.weapon.spriteFlipped
 	mul := float64(1)
 	if g.player.angle > math.Pi/2 || g.player.angle < -1*math.Pi/2 {
-		playerSprite = g.ojasSS.Frame2
+		playerSprite = ojasSS.Frame2
 		playerAngle = playerAngle - math.Pi
 		weaponSprite = g.player.weapon.sprite
 		mul = -1
 	}
 	drawn += g.renderSprite(g.player.x, g.player.y, 0, 0, playerAngle, 1.0, 1.0, 1.0, playerSprite, screen)
+	drawn += g.renderSprite(g.player.x, g.player.y, -10*mul, 2, playerAngle, 1.0, 1.0, 1.0, sandstoneSS.TorchMulti, screen)
 	if g.player.weapon != nil {
 		drawn += g.renderSprite(g.player.x, g.player.y, 11*mul, 9, playerAngle, 1.0, 1.0, 1.0, weaponSprite, screen)
 	}
@@ -1086,7 +1039,18 @@ func (g *game) hurtCreep(c *gameCreep, damage int) error {
 	}
 
 	// Killed creep.
-	g.player.score += c.killScore()
+	g.player.score += c.killScore() * g.levelNum
+
+	if c.creepType == TypeTorch {
+		// TODO play break sound
+		c.frames = 1
+		c.frame = 0
+		c.sprites = []*ebiten.Image{
+			sandstoneSS.TorchTop9,
+		}
+		g.level.bakePartialLightmap(int(c.x), int(c.y))
+		return nil
+	}
 
 	// Play vampire die sound.
 
diff --git a/img.go b/img.go
index e07aa9f..18affc4 100644
--- a/img.go
+++ b/img.go
@@ -11,6 +11,10 @@ const (
 	ImageVampire1 = iota
 	ImageVampire2
 	ImageVampire3
+	ImageGhost1
+	ImageGhost1R
+	ImageGhost2
+	ImageGhost2R
 	ImageGarlic
 	ImageHolyWater
 	ImageHeart
@@ -23,6 +27,10 @@ var imageMap = map[int]string{
 	ImageVampire1:    "assets/creeps/vampire/vampire1.png",
 	ImageVampire2:    "assets/creeps/vampire/vampire2.png",
 	ImageVampire3:    "assets/creeps/vampire/vampire3.png",
+	ImageGhost1:      "assets/creeps/ghost/ghost1.png",
+	ImageGhost1R:     "assets/creeps/ghost/ghost1r.png",
+	ImageGhost2:      "assets/creeps/ghost/ghost2.png",
+	ImageGhost2R:     "assets/creeps/ghost/ghost2r.png",
 	ImageGarlic:      "assets/items/garlic.png",
 	ImageHolyWater:   "assets/items/holywater.png",
 	ImageHeart:       "assets/ui/heart.png",
diff --git a/level.go b/level.go
index 86c3662..483d08e 100644
--- a/level.go
+++ b/level.go
@@ -23,6 +23,8 @@ type Level struct {
 	liveCreeps int
 
 	player *gamePlayer
+
+	torches []*gameCreep
 }
 
 // Tile returns the tile at the provided coordinates, or nil.
@@ -97,7 +99,7 @@ SPAWNLOCATION:
 }
 
 // NewLevel returns a new randomly generated Level.
-func NewLevel(levelNum int) (*Level, error) {
+func NewLevel(levelNum int, p *gamePlayer) (*Level, error) {
 	multiplier := levelNum
 	if multiplier > 2 {
 		multiplier = 2
@@ -106,9 +108,11 @@ func NewLevel(levelNum int) (*Level, error) {
 		w:        336 * multiplier,
 		h:        336 * multiplier,
 		tileSize: 32,
+		player:   p,
 	}
 
-	sandstoneSS, err := LoadEnvironmentSpriteSheet()
+	var err error
+	sandstoneSS, err = LoadEnvironmentSpriteSheet()
 	if err != nil {
 		return nil, fmt.Errorf("failed to load embedded spritesheet: %s", err)
 	}
@@ -198,6 +202,10 @@ func NewLevel(levelNum int) (*Level, error) {
 				case spriteTop:
 					if !bottomLeft || !bottomRight || left || right {
 						neighbor.AddSprite(sandstoneSS.WallPillar)
+						c := newCreep(TypeTorch, l, l.player)
+						c.x, c.y = float64(nx), float64(ny)
+						l.creeps = append(l.creeps, c)
+						l.torches = append(l.torches, c)
 					} else {
 						neighbor.AddSprite(sandstoneSS.WallTop)
 					}
@@ -222,9 +230,74 @@ func NewLevel(levelNum int) (*Level, error) {
 		}
 	}
 
+	l.bakeLightmap()
+
 	return l, nil
 }
 
+func (l *Level) bakeLightmap() {
+	for x := 0; x < l.w; x++ {
+		for y := 0; y < l.h; y++ {
+			t := l.tiles[y][x]
+			v := 0.0
+			for _, torch := range l.torches {
+				if torch.health == 0 {
+					continue
+				}
+				torchV := colorScaleValue(float64(x), float64(y), torch.x, torch.y)
+				v += torchV
+			}
+			t.colorScale = v
+		}
+	}
+}
+
+func (l *Level) bakePartialLightmap(lx, ly int) {
+	radius := 16
+	for x := lx - radius; x < lx+radius; x++ {
+		for y := ly - radius; y < ly+radius; y++ {
+			t := l.Tile(x, y)
+			if t == nil {
+				continue
+			}
+			v := 0.0
+			for _, torch := range l.torches {
+				if torch.health == 0 {
+					continue
+				}
+				torchV := colorScaleValue(float64(x), float64(y), torch.x, torch.y)
+				v += torchV
+			}
+			t.colorScale = v
+		}
+	}
+}
+
+func (l *Level) addCreep(creepType int) {
+	c := newCreep(creepType, l, l.player)
+	l.creeps = append(l.creeps, c)
+}
+
 func angle(x1, y1, x2, y2 float64) float64 {
 	return math.Atan2(y1-y2, x1-x2)
 }
+
+func colorScaleValue(x, y, bx, by float64) float64 {
+	dx, dy := deltaXY(x, y, bx, by)
+	sD := 7 / (dx + dy)
+	if sD > 1 {
+		sD = 1
+	}
+	sDB := sD
+	if dx > 4 {
+		sDB *= 0.6 / (dx / 4)
+	}
+	if dy > 4 {
+		sDB *= 0.6 / (dy / 4)
+	}
+	sD = sD * 2 * sDB
+	if sD > 1 {
+		sD = 1
+	}
+	return sD
+}
diff --git a/ss_bat.go b/ss_bat.go
index f854833..1ac496e 100644
--- a/ss_bat.go
+++ b/ss_bat.go
@@ -7,6 +7,8 @@ import (
 	"github.com/hajimehoshi/ebiten/v2"
 )
 
+var batSS *BatSpriteSheet
+
 // BatSpriteSheet represents a collection of sprite images.
 type BatSpriteSheet struct {
 	Frame1 *ebiten.Image
diff --git a/ss_environment.go b/ss_environment.go
index db5a7de..6ff44ed 100644
--- a/ss_environment.go
+++ b/ss_environment.go
@@ -7,6 +7,8 @@ import (
 	"github.com/hajimehoshi/ebiten/v2"
 )
 
+var sandstoneSS *EnvironmentSpriteSheet
+
 // EnvironmentSpriteSheet represents a collection of sprite images.
 type EnvironmentSpriteSheet struct {
 	FloorA          *ebiten.Image
@@ -21,42 +23,78 @@ type EnvironmentSpriteSheet struct {
 	WallTopLeft     *ebiten.Image
 	WallTopRight    *ebiten.Image
 	WallPillar      *ebiten.Image
+	TorchTop1       *ebiten.Image
+	TorchTop2       *ebiten.Image
+	TorchTop3       *ebiten.Image
+	TorchTop4       *ebiten.Image
+	TorchTop5       *ebiten.Image
+	TorchTop6       *ebiten.Image
+	TorchTop7       *ebiten.Image
+	TorchTop8       *ebiten.Image
+	TorchTop9       *ebiten.Image
+	TorchMulti      *ebiten.Image
 }
 
 // LoadEnvironmentSpriteSheet loads the embedded EnvironmentSpriteSheet.
 func LoadEnvironmentSpriteSheet() (*EnvironmentSpriteSheet, error) {
 	tileSize := 32
 
-	f, err := assetsFS.Open("assets/sandstone-dungeon/Tiles-SandstoneDungeons.png")
+	// Populate EnvironmentSpriteSheet.
+	s := &EnvironmentSpriteSheet{}
+
+	// Dungeon sprites
+	dungeonFile, err := assetsFS.Open("assets/sandstone-dungeon/Tiles-SandstoneDungeons.png")
 	if err != nil {
 		return nil, err
 	}
-	img, _, err := image.Decode(f)
+	defer dungeonFile.Close()
+	dungeonImg, _, err := image.Decode(dungeonFile)
 	if err != nil {
 		return nil, err
 	}
-
-	sheet := ebiten.NewImageFromImage(img)
-
-	// spriteAt returns a sprite at the provided coordinates.
-	spriteAt := func(x, y int) *ebiten.Image {
-		return sheet.SubImage(image.Rect(x*tileSize, (y+1)*tileSize, (x+1)*tileSize, y*tileSize)).(*ebiten.Image)
+	dungeonSheet := ebiten.NewImageFromImage(dungeonImg)
+	// dungeonSpriteAt returns a sprite at the provided coordinates.
+	dungeonSpriteAt := func(x, y int) *ebiten.Image {
+		return dungeonSheet.SubImage(image.Rect(x*tileSize, (y+1)*tileSize, (x+1)*tileSize, y*tileSize)).(*ebiten.Image)
 	}
+	s.FloorA = dungeonSpriteAt(3, 1)
+	s.FloorB = dungeonSpriteAt(2, 0)
+	s.FloorC = dungeonSpriteAt(2, 1)
+	s.WallTop = dungeonSpriteAt(1, 2)
+	s.WallBottom = dungeonSpriteAt(1, 6)
+	s.WallBottomLeft = dungeonSpriteAt(2, 6)
+	s.WallBottomRight = dungeonSpriteAt(0, 6)
+	s.WallLeft = dungeonSpriteAt(2, 2)
+	s.WallRight = dungeonSpriteAt(0, 2)
+	s.WallTopLeft = dungeonSpriteAt(2, 3)
+	s.WallTopRight = dungeonSpriteAt(0, 3)
+	s.WallPillar = dungeonSpriteAt(8, 4)
 
-	// Populate EnvironmentSpriteSheet.
-	s := &EnvironmentSpriteSheet{}
-	s.FloorA = spriteAt(3, 1)
-	s.FloorB = spriteAt(2, 0)
-	s.FloorC = spriteAt(2, 1)
-	s.WallTop = spriteAt(1, 2)
-	s.WallBottom = spriteAt(1, 6)
-	s.WallBottomLeft = spriteAt(2, 6)
-	s.WallBottomRight = spriteAt(0, 6)
-	s.WallLeft = spriteAt(2, 2)
-	s.WallRight = spriteAt(0, 2)
-	s.WallTopLeft = spriteAt(2, 3)
-	s.WallTopRight = spriteAt(0, 3)
-	s.WallPillar = spriteAt(8, 4)
+	// Prop sprites
+	propFile, err := assetsFS.Open("assets/sandstone-dungeon/Tiles-Props-pack.png")
+	if err != nil {
+		return nil, err
+	}
+	defer propFile.Close()
+	propImg, _, err := image.Decode(propFile)
+	if err != nil {
+		return nil, err
+	}
+	propSheet := ebiten.NewImageFromImage(propImg)
+	// dungeonSpriteAt returns a sprite at the provided coordinates.
+	propSpriteAt := func(x, y int) *ebiten.Image {
+		return propSheet.SubImage(image.Rect(x*tileSize, (y+1)*tileSize, (x+1)*tileSize, y*tileSize)).(*ebiten.Image)
+	}
+	s.TorchTop1 = propSpriteAt(0, 2)
+	s.TorchTop2 = propSpriteAt(1, 2)
+	s.TorchTop3 = propSpriteAt(2, 2)
+	s.TorchTop4 = propSpriteAt(3, 2)
+	s.TorchTop5 = propSpriteAt(4, 2)
+	s.TorchTop6 = propSpriteAt(5, 2)
+	s.TorchTop7 = propSpriteAt(6, 2)
+	s.TorchTop8 = propSpriteAt(7, 2)
+	s.TorchTop9 = propSpriteAt(8, 2)
+	s.TorchMulti = propSpriteAt(2, 4)
 
 	return s, nil
 }
diff --git a/ss_player.go b/ss_player.go
index 13092c9..95d870e 100644
--- a/ss_player.go
+++ b/ss_player.go
@@ -8,6 +8,8 @@ import (
 	"github.com/hajimehoshi/ebiten/v2"
 )
 
+var ojasSS *PlayerSpriteSheet
+
 // PlayerSpriteSheet represents a collection of sprite images.
 type PlayerSpriteSheet struct {
 	Frame1 *ebiten.Image
diff --git a/tile.go b/tile.go
index e128438..10e2608 100644
--- a/tile.go
+++ b/tile.go
@@ -7,9 +7,10 @@ import (
 // Tile represents a space with an x,y coordinate within a Level. Any number of
 // sprites may be added to a Tile.
 type Tile struct {
-	sprites []*ebiten.Image
-	floor   bool
-	wall    bool
+	sprites    []*ebiten.Image
+	floor      bool
+	wall       bool
+	colorScale float64 // Minimum color scale (brightness)
 }
 
 // AddSprite adds a sprite to the Tile.