===================================================================
--- original.js
+++ change.js
@@ -54,8 +54,21 @@
 			self.destroy();
 		}
 	};
 });
+// Button class
+var Button = Container.expand(function () {
+	var self = Container.call(this);
+	var buttonGraphics = self.attachAsset('button', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.down = function (x, y, obj) {
+		var bubble = game.addChild(new Bubble());
+		bubble.x = bird.x;
+		bubble.y = bird.y;
+	};
+});
 // Cloud class
 var Cloud = Container.expand(function () {
 	var self = Container.call(this);
 	var appleGraphics = self.attachAsset('apple', {
@@ -123,19 +136,19 @@
 });
 var enemy = game.addChild(new Enemy());
 enemy.x = Math.random() * 2048;
 enemy.y = Math.random() * 2732;
+var button = game.addChild(new Button());
+button.x = 2048 / 2;
+button.y = 2732 - 150;
 LK.gui.top.addChild(scoreTxt);
 game.down = function (x, y, obj) {
 	bird.y -= 100;
 	if (x < bird.x) {
 		bird.x -= 100;
 	} else if (x > bird.x) {
 		bird.x += 100;
 	}
-	var bubble = game.addChild(new Bubble());
-	bubble.x = bird.x;
-	bubble.y = bird.y;
 };
 var boss;
 game.update = function () {
 	if (bird.y > 2732) {