/**** 
* Classes
****/ 
// Assets will be automatically created and loaded during gameplay
// Ball class
var Ball = Container.expand(function () {
	var self = Container.call(this);
	var ballGraphics = self.attachAsset('ball', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.direction = 0; // 0: right, 1: down, 2: left, 3: up
	self.update = function () {
		switch (self.direction) {
			case 0:
				self.x += self.speed;
				break;
			case 1:
				self.y += self.speed;
				break;
			case 2:
				self.x -= self.speed;
				break;
			case 3:
				self.y -= self.speed;
				break;
		}
		// Boundary check
		if (self.x < 0) {
			self.x = 0;
		}
		if (self.x > 2048) {
			self.x = 2048;
		}
		if (self.y < 0) {
			self.y = 0;
		}
		if (self.y > 2732) {
			self.y = 2732;
		}
	};
	self.changeDirection = function () {
		self.direction = (self.direction + 1) % 4;
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB // Change background color to sky blue
});

/**** 
* Game Code
****/ 
var ball = game.addChild(new Ball());
ball.x = 1024; // Center horizontally
ball.y = 1366; // Center vertically
game.down = function (x, y, obj) {
	ball.changeDirection();
};
game.update = function () {
	ball.update();
};

===================================================================
--- original.js
+++ change.js
@@ -48,9 +48,9 @@
 /**** 
 * Initialize Game
 ****/ 
 var game = new LK.Game({
-	backgroundColor: 0xFFFFFF // Change background color to white
+	backgroundColor: 0x87CEEB // Change background color to sky blue
 });
 
 /**** 
 * Game Code