/**** 
* 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();
		}
	};
});
// Cloud class
var Cloud = Container.expand(function () {
	var self = Container.call(this);
	// Randomly assign cloud asset
	var cloudAssets = ['cloud1', 'cloud2', 'cloud3'];
	var randomCloud = cloudAssets[Math.floor(Math.random() * cloudAssets.length)];
	var cloudSprite = self.attachAsset(randomCloud, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set cloud sprite to be 70% transparent
	cloudSprite.alpha = 0.3;
	// Set cloud speed
	self.speed = 2;
	// This is automatically called every game tick, if the cloud is attached!
	self.update = function () {
		self.y += self.speed * (1 + self.x / 2048 * 0.5);
		// Reset the cloud position if it goes off the screen
		if (self.y > 2732 + self.height) {
			self.y = -self.height;
		}
	};
});
// 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);
		}
	};
	// Add touch event handlers to the player's vehicle to enable dragging
	self.down = function (x, y, obj) {
		// Store the initial touch position
		self.initialTouchPosition = {
			x: x,
			y: y
		};
		// Store the initial position of the player's vehicle
		self.initialPosition = {
			x: self.x,
			y: self.y
		};
	};
	self.move = function (x, y, obj) {
		// Update the position of the player's vehicle relative to the speed and direction at which the player moves their finger
		self.x = self.initialPosition.x + (x - self.initialTouchPosition.x);
		self.y = self.initialPosition.y + (y - self.initialTouchPosition.y);
	};
	self.up = function (x, y, obj) {
		// Reset the initial touch position and the initial position of the player's vehicle
		self.initialTouchPosition = null;
		self.initialPosition = null;
	};
});

/**** 
* 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());
playerVehicle.x = 2048 / 2;
playerVehicle.y = 2732 - playerVehicle.height / 2;
var dragNode = null;
game.down = function (x, y, obj) {
	dragNode = playerVehicle;
	dragNode.initialTouchPosition = {
		x: x,
		y: y
	};
	dragNode.initialPosition = {
		x: playerVehicle.x,
		y: playerVehicle.y
	};
};
game.move = function (x, y, obj) {
	if (dragNode) {
		dragNode.x = dragNode.initialPosition.x + (x - dragNode.initialTouchPosition.x);
		dragNode.y = dragNode.initialPosition.y + (y - dragNode.initialTouchPosition.y);
	}
};
game.up = function (x, y, obj) {
	if (dragNode) {
		dragNode = null;
	}
};
// Add clouds to the game
var cloud1 = game.addChild(new Cloud());
cloud1.x = 2048 / 4;
cloud1.y = -cloud1.height;
cloud1.speed = 1;
cloud1.attachAsset('cloud1', {
	anchorX: 0.5,
	anchorY: 0.5
});
var cloud2 = game.addChild(new Cloud());
cloud2.x = 2048 / 2;
cloud2.y = -cloud2.height;
cloud2.speed = 2;
cloud2.attachAsset('cloud2', {
	anchorX: 0.5,
	anchorY: 0.5
});
var cloud3 = game.addChild(new Cloud());
cloud3.x = 2048 * 3 / 4;
cloud3.y = -cloud3.height;
cloud3.speed = 3;
cloud3.attachAsset('cloud3', {
	anchorX: 0.5,
	anchorY: 0.5
});

===================================================================
--- original.js
+++ change.js
@@ -22,10 +22,12 @@
 });
 // Cloud class
 var Cloud = Container.expand(function () {
 	var self = Container.call(this);
-	// Attach the cloud sprite
-	var cloudSprite = self.attachAsset('cloud', {
+	// Randomly assign cloud asset
+	var cloudAssets = ['cloud1', 'cloud2', 'cloud3'];
+	var randomCloud = cloudAssets[Math.floor(Math.random() * cloudAssets.length)];
+	var cloudSprite = self.attachAsset(randomCloud, {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
 	// Set cloud sprite to be 70% transparent