diff --git a/TODO.md b/TODO.md
index f876cf6..40c5c84 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,10 +1,12 @@
-- [ ] Increase difficulty.
+- [X] Increase difficulty.
 - [ ] Add music & sounds.
 - [ ] Keep score/difficulty level (resume & restart).
 - [ ] Explain controls on info page.
 - [ ] Fix usage of go/embed (and remove rice again).
-- [ ] Add monster animations (jumping on tile & towards new tile).
+- [X] Add monster animations (~~jumping on tile &~~ towards new tile).
 - [ ] Scale icons (heart & star on right side) when playing.
 - [ ] Change layout when playing in portrait mode.
 - [X] Fix wobble animation.
-- [ ] Add more unit tests?
\ No newline at end of file
+- [ ] Add more unit tests?
+- [ ] Fix z-fighting of monsters.
+- [ ] Add exploding animation of monsters.
\ No newline at end of file
diff --git a/cmd/tins2021/levelcontroller.go b/cmd/tins2021/levelcontroller.go
index 0bd7e06..f152dbf 100644
--- a/cmd/tins2021/levelcontroller.go
+++ b/cmd/tins2021/levelcontroller.go
@@ -94,7 +94,7 @@ func (r *levelController) Handle(ctx ui.Context, e ui.Event) bool {
 	r.MovingMonsters.Update()
 	var jumped []geom.Point
 	for pos, animation := range r.MovingMonsters.Values {
-		if animation.Frame < 15 {
+		if animation.Frame < 40 { // after 40 frames the player hit is checked
 			continue
 		}
 		target := r.Level.MonsterTargets[pos]
@@ -104,7 +104,7 @@ func (r *levelController) Handle(ctx ui.Context, e ui.Event) bool {
 			r.Level.DecrementLive()
 			continue
 		}
-		if animation.Frame < 20 {
+		if animation.Frame < 50 { // after 50 frames the animation has finished
 			continue
 		}
 		r.Level.MoveMonster(target, pos)
@@ -149,8 +149,8 @@ func (r *levelController) Play(level *tins2021.Level) {
 		"star":  tins2021.NewAnimations(50*time.Millisecond, defaultAnimationFrames, true, true),
 		"heart": tins2021.NewAnimations(80*time.Millisecond, defaultAnimationFrames, true, true),
 	}
-	r.IdleMonsters = tins2021.NewAnimations(500*time.Millisecond, 100, false, false)
-	r.MovingMonsters = tins2021.NewAnimations(50*time.Millisecond, 20, false, false)
+	r.IdleMonsters = tins2021.NewAnimations(200*time.Millisecond, 100, false, false)
+	r.MovingMonsters = tins2021.NewAnimations(16*time.Millisecond, 50, false, false)
 	for monster := range level.Monsters {
 		r.IdleMonsters.Frame(monster)
 	}
@@ -206,9 +206,9 @@ func (r levelController) Render(ctx ui.Context) {
 
 	distances := r.Level.Tiles.Distances(r.Level.Player)
 
-	positionOfTile := func(position geom.Point, tile *tins2021.Tile) (topLeft, centerOfPlatform geom.PointF32) {
+	positionOfTile := func(position geom.Point) (topLeft, centerOfPlatform geom.PointF32) {
 		topLeft = toScreen(position)
-		if tile.Inversed {
+		if r.Level.Tiles[position].Inversed {
 			return topLeft, topLeft.Add2D(.5*float32(cubeWidth), .6*float32(cubeHeight))
 		}
 		return topLeft, topLeft.Add2D(.5*float32(cubeWidth), .2*float32(cubeHeight))
@@ -221,7 +221,7 @@ func (r levelController) Render(ctx ui.Context) {
 			if tile == nil {
 				continue
 			}
-			screenPos, platformPos := positionOfTile(pos, tile)
+			screenPos, platformPos := positionOfTile(pos)
 			tileTexture := cubes.Normal.Texture
 			if tile.Inversed {
 				tileTexture = cubes.Inversed.Texture
@@ -253,9 +253,19 @@ func (r levelController) Render(ctx ui.Context) {
 		if tile == nil {
 			continue
 		}
-		_, platformPos := positionOfTile(pos, tile)
 		name := r.app.MonsterTextureNames[monsterType.Type()]
-		monsterTextures[monsterType.Type()].Draw(renderer, platformPos.Add(propOffset), r.Animations[name].Frame(pos))
+		texture := monsterTextures[monsterType.Type()]
+		_, platformPos := positionOfTile(pos)
+		if target, ok := r.Level.MonsterTargets[pos]; ok {
+			_, targetPlatformPos := positionOfTile(target)
+			dt := float32(r.MovingMonsters.Frame(pos)) / 50.
+			delta := targetPlatformPos.Sub(platformPos)
+			curve := geom.PtF32(0, .6*geom.Sin32(dt*geom.Pi)*textureWidth)
+			interpolatedPos := platformPos.Add(delta.Mul(dt)).Sub(curve)
+			texture.Draw(renderer, interpolatedPos.Add(propOffset), r.Animations[name].Frame(pos))
+		} else {
+			texture.Draw(renderer, platformPos.Add(propOffset), r.Animations[name].Frame(pos))
+		}
 	}
 
 	textColor := ctx.Style().Palette.Text
diff --git a/level.go b/level.go
index 017a602..ab80919 100644
--- a/level.go
+++ b/level.go
@@ -170,7 +170,7 @@ func (l *Level) Randomize(difficulty int, stars int) {
 		l.Tiles[pos].Star = true
 		stars--
 	}
-	hearts := 1 + (100-difficulty)/50 // [3..1] (only difficulty has 3 hearts)
+	hearts := rand.Intn(2 + (100-difficulty)/50) // [3..1] (only difficulty 0 has 3 hearts)
 	for hearts > 0 {
 		pos := pick(difficulty)
 		if l.Tiles[pos].Occupied() {
@@ -179,9 +179,9 @@ func (l *Level) Randomize(difficulty int, stars int) {
 		l.Tiles[pos].Heart = true
 		hearts--
 	}
-	monsters := 2 + (8 * difficulty / 100)
-	minRandomMonster := (100-difficulty)*80/100 + 10 // [90..10]
-	minChaserMonster := (100-difficulty)*50/100 + 50 // [100..50]
+	monsters := 5 + (25 * difficulty / 100)
+	minRandomMonster := (100-difficulty)*60/100 + 10 // [70..10]
+	minChaserMonster := (100-difficulty)*70/100 + 25 // [95..25]
 	for monsters > 0 {
 		pos := pick(100 - difficulty)
 		curr := l.Monsters[pos]