===================================================================
--- original.js
+++ change.js
@@ -1,51 +1,51 @@
-/****
+/**** 
 * Classes
 ****/
 // Define the Hero class
 var Hero = Container.expand(function () {
-  var self = Container.call(this);
-  var heroGraphics = self.createAsset('hero', 'Hero character', 0.5, 0.5);
-  self.speed = 5;
-  self.shoot = function () {
-    var bullet = new HeroBullet();
-    bullet.x = self.x;
-    bullet.y = self.y;
-    game.addChild(bullet);
-    bullets.push(bullet);
-  };
-  self.move = function (direction) {
-    self.x += direction.x * self.speed;
-    self.y += direction.y * self.speed;
-  };
+	var self = Container.call(this);
+	var heroGraphics = self.createAsset('hero', 'Hero character', 0.5, 0.5);
+	self.speed = 5;
+	self.shoot = function () {
+		var bullet = new HeroBullet();
+		bullet.x = self.x;
+		bullet.y = self.y;
+		game.addChild(bullet);
+		bullets.push(bullet);
+	};
+	self.move = function (direction) {
+		self.x += direction.x * self.speed;
+		self.y += direction.y * self.speed;
+	};
 });
 // Define the HeroBullet class
 var HeroBullet = Container.expand(function () {
-  var self = Container.call(this);
-  var bulletGraphics = self.createAsset('heroBullet', 'Hero bullet', 0.5, 1);
-  self.speed = -10;
-  self.move = function () {
-    self.y += self.speed;
-  };
+	var self = Container.call(this);
+	var bulletGraphics = self.createAsset('heroBullet', 'Hero bullet', 0.5, 1);
+	self.speed = -10;
+	self.move = function () {
+		self.y += self.speed;
+	};
 });
 // Define the Zombie class
 var Zombie = Container.expand(function () {
-  var self = Container.call(this);
-  var zombieGraphics = self.createAsset('zombie', 'Zombie enemy', 0.5, 0.5);
-  self.speed = 1;
-  self.move = function () {
-    self.y += self.speed;
-  };
+	var self = Container.call(this);
+	var zombieGraphics = self.createAsset('realisticZombie', 'Realistic Zombie enemy', 0.5, 0.5);
+	self.speed = 1;
+	self.move = function () {
+		self.y += self.speed;
+	};
 });
 
-/****
+/**** 
 * Initialize Game
 ****/
 var game = new LK.Game({
-  backgroundColor: 0x000000 // Init game with black background
+	backgroundColor: 0x000000 // Init game with black background
 });
 
-/****
+/**** 
 * Game Code
 ****/
 // Initialize important asset arrays
 var bullets = [];
@@ -57,50 +57,50 @@
 hero.x = 2048 / 2;
 hero.y = 2732 - 100; // Position hero near the bottom of the screen
 // Game logic and event handlers
 game.on('down', function (obj) {
-  var touchPos = obj.event.getLocalPosition(game);
-  var direction = {
-    x: 0,
-    y: 0
-  };
-  if (touchPos.x < hero.x) {
-    direction.x = -1;
-  } else if (touchPos.x > hero.x) {
-    direction.x = 1;
-  }
-  hero.move(direction);
-  hero.shoot();
+	var touchPos = obj.event.getLocalPosition(game);
+	var direction = {
+		x: 0,
+		y: 0
+	};
+	if (touchPos.x < hero.x) {
+		direction.x = -1;
+	} else if (touchPos.x > hero.x) {
+		direction.x = 1;
+	}
+	hero.move(direction);
+	hero.shoot();
 });
 LK.on('tick', function () {
-  if (isGameOver) {
-    LK.showGameOver();
-    return;
-  }
-  // Move bullets and check for off-screen
-  for (var i = bullets.length - 1; i >= 0; i--) {
-    bullets[i].move();
-    if (bullets[i].y < 0) {
-      bullets[i].destroy();
-      bullets.splice(i, 1);
-    }
-  }
-  // Move zombies and check for collision with hero
-  for (var j = zombies.length - 1; j >= 0; j--) {
-    zombies[j].move();
-    if (zombies[j].y > 2732) {
-      zombies[j].destroy();
-      zombies.splice(j, 1);
-    } else if (zombies[j].intersects(hero)) {
-      isGameOver = true;
-    }
-  }
-  // Spawn zombies
-  if (LK.ticks % 120 == 0) {
-    // Spawn a zombie every 2 seconds
-    var zombie = new Zombie();
-    zombie.x = Math.random() * 2048;
-    zombie.y = -50; // Start off-screen
-    zombies.push(zombie);
-    game.addChild(zombie);
-  }
+	if (isGameOver) {
+		LK.showGameOver();
+		return;
+	}
+	// Move bullets and check for off-screen
+	for (var i = bullets.length - 1; i >= 0; i--) {
+		bullets[i].move();
+		if (bullets[i].y < 0) {
+			bullets[i].destroy();
+			bullets.splice(i, 1);
+		}
+	}
+	// Move zombies and check for collision with hero
+	for (var j = zombies.length - 1; j >= 0; j--) {
+		zombies[j].move();
+		if (zombies[j].y > 2732) {
+			zombies[j].destroy();
+			zombies.splice(j, 1);
+		} else if (zombies[j].intersects(hero)) {
+			isGameOver = true;
+		}
+	}
+	// Spawn zombies
+	if (LK.ticks % 120 == 0) {
+		// Spawn a zombie every 2 seconds
+		var zombie = new Zombie();
+		zombie.x = Math.random() * 2048;
+		zombie.y = -50; // Start off-screen
+		zombies.push(zombie);
+		game.addChild(zombie);
+	}
 });
\ No newline at end of file