===================================================================
--- original.js
+++ change.js
@@ -1,58 +1,66 @@
-/****
+/**** 
 * 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;
-  };
+	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: 0x000000 // Init game with black background
+	backgroundColor: 0xFFFFFF // Change background color to white
 });
 
-/****
+/**** 
 * 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();
+	ball.changeDirection();
 };
 game.update = function () {
-  ball.update();
+	ball.update();
 };
\ No newline at end of file