/**** 
* Classes
****/ 
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	// Attach the bullet sprite
	var bulletSprite = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set bullet speed
	self.speed = -10;
	// This is automatically called every game tick, if the bullet is attached!
	self.update = function () {
		self.y += self.speed;
		// Destroy the bullet if it goes off the screen
		if (self.y < -self.height) {
			self.destroy();
		}
	};
});
// Player's vehicle class
var PlayerVehicle = Container.expand(function () {
	var self = Container.call(this);
	// Attach the player's vehicle sprite
	var vehicleSprite = self.attachAsset('playerVehicle', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 2,
		scaleY: 2
	});
	// This is automatically called every game tick, if the player's vehicle is attached!
	self.update = function () {
		// Fire a bullet every 30 ticks
		if (LK.ticks % 30 == 0) {
			var bullet = new Bullet();
			bullet.x = self.x;
			bullet.y = self.y - self.height / 2 - bullet.height / 2;
			game.addChild(bullet);
		}
	};
});

/**** 
* Initialize Game
****/ 
// Add player's vehicle to the game
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Add player's vehicle to the game
var playerVehicle = game.addChild(new PlayerVehicle());
// Position player's vehicle at the bottom of the screen
playerVehicle.x = 2048 / 2;
playerVehicle.y = 2732 - playerVehicle.height / 2;

===================================================================
--- original.js
+++ change.js
@@ -1,7 +1,26 @@
 /**** 
 * Classes
 ****/ 
+// Bullet class
+var Bullet = Container.expand(function () {
+	var self = Container.call(this);
+	// Attach the bullet sprite
+	var bulletSprite = self.attachAsset('bullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Set bullet speed
+	self.speed = -10;
+	// This is automatically called every game tick, if the bullet is attached!
+	self.update = function () {
+		self.y += self.speed;
+		// Destroy the bullet if it goes off the screen
+		if (self.y < -self.height) {
+			self.destroy();
+		}
+	};
+});
 // Player's vehicle class
 var PlayerVehicle = Container.expand(function () {
 	var self = Container.call(this);
 	// Attach the player's vehicle sprite
@@ -10,8 +29,18 @@
 		anchorY: 0.5,
 		scaleX: 2,
 		scaleY: 2
 	});
+	// This is automatically called every game tick, if the player's vehicle is attached!
+	self.update = function () {
+		// Fire a bullet every 30 ticks
+		if (LK.ticks % 30 == 0) {
+			var bullet = new Bullet();
+			bullet.x = self.x;
+			bullet.y = self.y - self.height / 2 - bullet.height / 2;
+			game.addChild(bullet);
+		}
+	};
 });
 
 /**** 
 * Initialize Game