/**** 
* Classes
****/ 
// The assets will be automatically created and loaded by the LK engine.
// Create a Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 0;
	self.gravity = 0.5;
	self.lift = -15;
	self.update = function () {
		self.speed += self.gravity;
		self.y += self.speed;
		if (self.y > 2732) {
			self.y = 2732;
			self.speed = 0;
		}
		if (self.y < 0) {
			self.y = 0;
			self.speed = 0;
		}
	};
	self.up = function () {
		self.speed += self.lift;
	};
});
// Create a Bridge class
var Bridge = Container.expand(function () {
	var self = Container.call(this);
	var bridgeGraphics = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.update = function () {
		self.x -= self.speed;
	};
});
// Create a Pipe class
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	var pipeGraphics = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.update = function () {
		self.x -= self.speed;
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb // Sky blue background
});

/**** 
* Game Code
****/ 
var bird = game.addChild(new Bird());
var score = 0;
var scoreTxt = new Text2('0', {
	size: 150,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
bird.x = 512;
bird.y = 1366;
var obstacles = [];
game.update = function () {
	if (LK.ticks % 120 == 0) {
		var bridge = new Bridge();
		bridge.x = 2048;
		bridge.y = Math.random() * (2048 - 512) + 512;
		obstacles.push(bridge);
		game.addChild(bridge);
	}
	for (var i = obstacles.length - 1; i >= 0; i--) {
		if (obstacles[i].x < -obstacles[i].width) {
			obstacles[i].destroy();
			obstacles.splice(i, 1);
			score += 1;
			scoreTxt.setText(score);
		}
		if (bird.intersects(obstacles[i])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
};
game.down = function (x, y, obj) {
	bird.up();
};

===================================================================
--- original.js
+++ change.js
@@ -72,30 +72,25 @@
 scoreTxt.anchor.set(0.5, 0);
 LK.gui.top.addChild(scoreTxt);
 bird.x = 512;
 bird.y = 1366;
-var pipes = [];
+var obstacles = [];
 game.update = function () {
 	if (LK.ticks % 120 == 0) {
-		var pipe = new Pipe();
-		pipe.x = 2048;
-		pipe.y = Math.random() * (2048 - 512) + 512;
-		pipes.push(pipe);
-		game.addChild(pipe);
 		var bridge = new Bridge();
 		bridge.x = 2048;
 		bridge.y = Math.random() * (2048 - 512) + 512;
-		pipes.push(bridge);
+		obstacles.push(bridge);
 		game.addChild(bridge);
 	}
-	for (var i = pipes.length - 1; i >= 0; i--) {
-		if (pipes[i].x < -pipes[i].width) {
-			pipes[i].destroy();
-			pipes.splice(i, 1);
+	for (var i = obstacles.length - 1; i >= 0; i--) {
+		if (obstacles[i].x < -obstacles[i].width) {
+			obstacles[i].destroy();
+			obstacles.splice(i, 1);
 			score += 1;
 			scoreTxt.setText(score);
 		}
-		if (bird.intersects(pipes[i])) {
+		if (bird.intersects(obstacles[i])) {
 			LK.effects.flashScreen(0xff0000, 1000);
 			LK.showGameOver();
 		}
 	}