diff --git a/src/app/collision_resolver.js b/src/app/collision_resolver.js
index 9f02bcf..8021fe4 100644
--- a/src/app/collision_resolver.js
+++ b/src/app/collision_resolver.js
@@ -74,9 +74,10 @@ function createCollisionResolver(spec) {
       if ((entity.meta.status & MetaStatus.active) !== 0) {
         item.meta.health -= entity.meta.damage
       }
-      if (item.meta.health <= 0) {
+      if (item.meta.health <= 0 && (item.meta.status & MetaStatus.active) !== 0) {
         item.meta.status &= ~MetaStatus.visible
         item.meta.status &= ~MetaStatus.active
+        emitter.emit('CollisionResolver:enemyDied', item)
       }
     } else if (entity.meta.type === MetaType.enemy && item.meta.type === MetaType.hero) {
       if ((entity.meta.status & MetaStatus.active) !== 0 && (item.meta.status & MetaStatus.invulnerable) === 0) {
diff --git a/src/app/game_input_controller.js b/src/app/game_input_controller.js
index c26dca9..65b2eb9 100644
--- a/src/app/game_input_controller.js
+++ b/src/app/game_input_controller.js
@@ -40,11 +40,11 @@ function createGameInputController(spec) {
     return paused
   }
 
-  docWindow.addEventListener('keyup', (e) => {
+  const onKeyUp = (e) => {
     keyboard[e.code] = false
-  })
+  }
 
-  docWindow.addEventListener('keydown', (e) => {
+  const onKeyDown = (e) => {
     keyboard[e.code] = true
     if (e.code === KeyMapping.dash && e.target === graphics.canvas) {
       e.preventDefault()
@@ -55,24 +55,38 @@ function createGameInputController(spec) {
     if (!isPaused()) {
       emitter.emit('GameInputController:keydown', e)
     }
-  })
+  }
 
-  graphics.canvas.addEventListener('mousemove', (e) => {
+  const onMouseMove = (e) => {
     setMousePoint(e.clientX, e.clientY)
-  })
+  }
 
-  graphics.canvas.addEventListener('mousedown', (e) => {
+  const onMouseDown = (e) => {
     setMousePoint(e.clientX, e.clientY)
     mouse.down = true
     if (!isPaused()) {
       emitter.emit('GameInputController:mousedown', mouse)
     }
-  })
+  }
 
-  graphics.canvas.addEventListener('mouseup', (e) => {
+  const onMouseUp = (e) => {
     setMousePoint(e.clientX, e.clientY)
     mouse.down = false
-  })
+  }
+
+  const unregisterListeners = () => {
+    docWindow.removeEventListener('keyup', onKeyUp)
+    docWindow.removeEventListener('keydown', onKeyDown)
+    graphics.canvas.removeEventListener('mousemove', onMouseMove)
+    graphics.canvas.removeEventListener('mousedown', onMouseDown)
+    graphics.canvas.removeEventListener('mouseup', onMouseUp)
+  }
+
+  docWindow.addEventListener('keyup', onKeyUp)
+  docWindow.addEventListener('keydown', onKeyDown)
+  graphics.canvas.addEventListener('mousemove', onMouseMove)
+  graphics.canvas.addEventListener('mousedown', onMouseDown)
+  graphics.canvas.addEventListener('mouseup', onMouseUp)
 
   return {
     isUp: isUp,
@@ -81,7 +95,8 @@ function createGameInputController(spec) {
     isRight: isRight,
     isDash: isDash,
     isPaused: isPaused,
-    mouse: mouse
+    mouse: mouse,
+    unregisterListeners: unregisterListeners
   }
 }
 
diff --git a/src/app/hero.js b/src/app/hero.js
index bc90c10..3ed463f 100644
--- a/src/app/hero.js
+++ b/src/app/hero.js
@@ -18,33 +18,6 @@ function createHero(spec) {
   let alphaResetTimerId = null
   let alpha = 1.0
 
-  emitter.on('GameInputController:keydown', (e) => {
-    if (dashResetTimerId || !inputController.isDash()) {
-      return
-    }
-    meta.status |= MetaStatus.invulnerable
-    isDashing = true
-    setTimeout(() => {
-      isDashing = false
-      meta.status &= ~MetaStatus.invulnerable
-    }, dashTimeout)
-    dashResetTimerId = setTimeout(() => {
-      dashResetTimerId = null
-    }, dashResetTimeout)
-  })
-
-  emitter.on('GameInputController:mousedown', (mouse) => {
-    if (ammunition.length <= 0) {
-      return
-    }
-    const projectile = ammunition.pop()
-    projectile.fire(mouse.x, mouse.y)
-  })
-
-  emitter.on('CollisionResolver:heroTouchedProjectile', (projectile) => {
-    ammunition.push(projectile)
-  })
-
   const getAlpha = () => {
     if (isDashing && !alphaResetTimerId) {
       alpha = 0.1
@@ -80,12 +53,52 @@ function createHero(spec) {
     graphics.ctx.restore()
   }
 
+  const onKeyDown = (e) => {
+    if (dashResetTimerId || !inputController.isDash()) {
+      return
+    }
+    meta.status |= MetaStatus.invulnerable
+    isDashing = true
+    emitter.emit('Hero:isDashing')
+    setTimeout(() => {
+      isDashing = false
+      meta.status &= ~MetaStatus.invulnerable
+    }, dashTimeout)
+    dashResetTimerId = setTimeout(() => {
+      dashResetTimerId = null
+    }, dashResetTimeout)
+  }
+
+  const onMouseDown = (mouse) => {
+    emitter.emit('Hero:onMouseDown', ammunition)
+    if (ammunition.length <= 0) {
+      return
+    }
+    const projectile = ammunition.pop()
+    projectile.fire(mouse.x, mouse.y)
+  }
+
+  const onTouchProjectile = (projectile) => {
+    ammunition.push(projectile)
+  }
+
+  const unregisterListeners = () => {
+    emitter.removeListener('GameInputController:keydown', onKeyDown)
+    emitter.removeListener('GameInputController:mousedown', onMouseDown)
+    emitter.removeListener('CollisionResolver:heroTouchedProjectile', onTouchProjectile)
+  }
+
+  emitter.on('GameInputController:keydown', onKeyDown)
+  emitter.on('GameInputController:mousedown', onMouseDown)
+  emitter.on('CollisionResolver:heroTouchedProjectile', onTouchProjectile)
+
   return {
     frame: frame,
     update: update,
     render: render,
     meta: meta,
-    ammunition: ammunition
+    ammunition: ammunition,
+    unregisterListeners: unregisterListeners
   }
 }
 
diff --git a/src/app/level.js b/src/app/level.js
index 54155b5..cbafa37 100644
--- a/src/app/level.js
+++ b/src/app/level.js
@@ -67,6 +67,8 @@ function createLevel(spec) {
 
   const complete = (callback) => {
     graphics.fadeOut(callback)
+    gameInputController.unregisterListeners()
+    hero.unregisterListeners()
   }
 
   return {
diff --git a/src/app/level_factory.js b/src/app/level_factory.js
index c04cd4c..cca8dc5 100644
--- a/src/app/level_factory.js
+++ b/src/app/level_factory.js
@@ -18,6 +18,7 @@ import createLevel from './level'
 function createLevelFactory(spec) {
   const emitter = spec.emitter
   const graphics = spec.graphics
+  const soundController = spec.soundController
 
   const makeLevel = (levelCount) => {
     const mazeGenerator = createMazeGenerator()
@@ -108,6 +109,7 @@ function createLevelFactory(spec) {
     return createLevel({
       emitter: emitter,
       gameInputController: gameInputController,
+      soundController: soundController,
       hero: hero,
       enemies: enemies,
       projectiles: projectiles,
diff --git a/src/app/main.js b/src/app/main.js
index 33d56dc..3c3b665 100644
--- a/src/app/main.js
+++ b/src/app/main.js
@@ -3,13 +3,19 @@ import EventEmitter from 'events'
 import createGraphics from './graphics'
 import createGame from './game'
 import createLevelFactory from './level_factory'
+import createSoundController from './sound_controller'
 
 document.addEventListener('DOMContentLoaded', function() {
   const canvas = document.getElementById('canvas')
   const emitter = new EventEmitter()
   const graphics = createGraphics({ canvas: canvas, emitter: emitter })
+  const soundController = createSoundController({ emitter: emitter })
   const runLoop = createRunLoop({ emitter: emitter })
-  const levelFactory = createLevelFactory({ emitter: emitter, graphics: graphics })
+  const levelFactory = createLevelFactory({
+    emitter: emitter,
+    graphics: graphics,
+    soundController: soundController
+  })
   const game = createGame({ emitter: emitter, levelFactory: levelFactory })
 
   emitter.on('RunLoop:begin', (timeStamp, frameDelta) => {
diff --git a/src/app/sound_controller.js b/src/app/sound_controller.js
new file mode 100644
index 0000000..ae8e8b9
--- /dev/null
+++ b/src/app/sound_controller.js
@@ -0,0 +1,79 @@
+/* eslint-disable no-sparse-arrays */
+/* eslint-disable comma-spacing */
+import jsfxr from 'jsfxr'
+import { randomIntInRange } from './utils'
+
+function createSoundController(spec) {
+  const emitter = spec.emitter
+
+  const play = (sound) => {
+    const player = new Audio()
+    player.src = sound
+    player.play()
+  }
+
+  emitter.on('Hero:onMouseDown', (ammunition) => {
+    if (ammunition.length) {
+      play(Sounds.hero.fire[randomIntInRange(0, Sounds.hero.fire.length)])
+    } else {
+      play(Sounds.hero.fireEmpty[randomIntInRange(0, Sounds.hero.fireEmpty.length)])
+    }
+  })
+
+  emitter.on('Hero:isDashing', () => {
+    play(Sounds.hero.dash[randomIntInRange(0, Sounds.hero.dash.length)])
+  })
+
+  emitter.on('CollisionResolver:heroTouchedProjectile', () => {
+    play(Sounds.hero.pickup[randomIntInRange(0, Sounds.hero.pickup.length)])
+  })
+
+  emitter.on('CollisionResolver:heroTouchedEnemy', () => {
+    play(Sounds.hero.hurt[randomIntInRange(0, Sounds.hero.hurt.length)])
+  })
+
+  emitter.on('CollisionResolver:enemyDied', () => {
+    play(Sounds.enemy.died[randomIntInRange(0, Sounds.enemy.died.length)])
+  })
+
+  return {
+    play: play
+  }
+}
+
+const Sounds = Object.freeze({
+  hero: {
+    fire: [
+      jsfxr([2,,0.138,0.2833,0.3363,0.8296,0.3507,-0.3135,,,,,,0.3683,0.0045,,,,1,,,0.1446,,0.5]),
+      jsfxr([2,,0.1096,0.2833,0.3363,0.8697,0.3609,-0.2655,-0.0371,,0.0505,-0.0091,,0.3119,0.0139,0.0224,,-0.0162,1,,0.0403,0.1926,0.0421,0.5]),
+      jsfxr([2,,0.1251,0.2802,0.3448,0.8455,0.3976,-0.3491,0.0315,,0.0088,,,0.2863,0.0009,,-0.0659,0.0129,0.9717,0.0212,0.0236,0.1267,-0.0284,0.5])
+    ],
+    fireEmpty: [
+      jsfxr([3,,0.0451,,0.287,0.3837,,-0.5973,,,,,,,,,,,1,,,0.0039,,0.44]),
+      jsfxr([3,,0.0451,0.0344,0.2436,0.3837,,-0.5575,0.0192,,,,,,0.043,,0.0443,,0.9888,0.0214,,0.0213,0.013,0.31])
+    ],
+    dash: [
+      jsfxr([0,,0.3845,,0.2544,0.543,,0.1433,,,,,,0.3354,,,,,0.6125,,,,,0.35]),
+      jsfxr([0,,0.4298,,0.311,0.6176,0.018,0.1433,0.0482,,,0.0041,0.0496,0.3003,0.0458,,0.04,0.007,0.6125,,0.0008,0.0115,-0.0065,0.35])
+    ],
+    pickup: [
+      jsfxr([0,,0.0101,0.5708,0.2528,0.5521,,,,,,0.3545,0.5621,,,,,,1,,,,,0.5]),
+      jsfxr([0,0.0074,0.01,0.6028,0.2642,0.5521,0.038,,-0.0054,,,0.3896,0.5173,0.0287,-0.0159,0.0239,,-0.0176,0.9738,,,0.036,0.0484,0.5])
+    ],
+    hurt: [
+      jsfxr([3,,0.1216,0.4737,0.3359,0.0444,,0.0488,,,,,,,,,0.102,-0.1476,1,,,,,0.5]),
+      jsfxr([3,,0.1114,0.4446,0.3265,0.0391,,0.0088,-0.03,,,0.0264,,,-0.0284,0.0162,0.102,-0.1667,1,,0.0309,0.0422,0.0105,0.5])
+    ]
+  },
+  enemy: {
+    died: [
+      jsfxr([0,0.0355,0.0514,,0.1975,0.2944,,-0.2884,0.0285,,,,,0.3462,-0.0323,,-0.0342,-0.0466,0.9699,-0.0228,,,0.0472,0.5]),
+      jsfxr([0,,0.0778,,0.1975,0.2944,0.0156,-0.2884,0.0285,,,,,0.3293,-0.0323,,-0.0378,-0.0848,0.9699,-0.0104,0.0358,,0.0814,0.5])
+    ]
+  }
+})
+
+export {
+  createSoundController as default,
+  Sounds
+}