/**** 
* Classes
****/ 
// Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.gravity = 0.5;
	self.lift = -10;
	self.velocity = 8;
	self.update = function () {
		self.velocity += self.gravity;
		self.y += self.velocity;
		if (self.y > 2732 - birdGraphics.height / 2) {
			self.y = 2732 - birdGraphics.height / 2;
			self.velocity = 0;
		}
		if (self.y < birdGraphics.height / 2) {
			self.y = birdGraphics.height / 2;
			self.velocity = 0;
		}
	};
	self.flap = function () {
		self.velocity = self.lift;
	};
});
//<Assets used in the game will automatically appear here>
// 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 = -5;
	self.update = function () {
		self.x += self.speed;
		if (self.x < -pipeGraphics.width) {
			self.destroy();
		}
	};
});

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

/**** 
* Game Code
****/ 
var bird;
var pipes = [];
var score = 0;
var scoreTxt;
var pipeInterval;
function resetGame() {
	bird = game.addChild(new Bird());
	bird.x = 2048 / 4;
	bird.y = 2732 / 2;
	pipes.forEach(function (pipe) {
		pipe.destroy();
	});
	pipes = [];
	score = 0;
	scoreTxt.setText(score);
	if (pipeInterval) {
		LK.clearInterval(pipeInterval);
	}
	pipeInterval = LK.setInterval(function () {
		var pipeTop = new Pipe();
		var pipeBottom = new Pipe();
		var gap = 400;
		var pipeHeight = 800;
		var pipeY = Math.random() * (2732 - gap - pipeHeight * 2) + pipeHeight;
		pipeTop.x = 2048;
		pipeTop.y = pipeY - gap / 2 - pipeHeight;
		pipeBottom.x = 2048;
		pipeBottom.y = pipeY + gap / 2 + pipeHeight;
		pipes.push(pipeTop);
		pipes.push(pipeBottom);
		game.addChild(pipeTop);
		game.addChild(pipeBottom);
	}, 1500);
}
game.down = function (x, y, obj) {
	bird.flap();
};
game.update = function () {
	bird.update();
	pipes.forEach(function (pipe) {
		pipe.update();
		if (pipe.intersects(bird)) {
			LK.showGameOver();
		}
	});
	pipes = pipes.filter(function (pipe) {
		return pipe.parent;
	});
	if (pipes.length > 0 && pipes[0].x < bird.x && !pipes[0].scored) {
		score++;
		scoreTxt.setText(score);
		pipes[0].scored = true;
	}
};
scoreTxt = new Text2('0', {
	size: 150,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
resetGame();

===================================================================
--- original.js
+++ change.js
@@ -9,9 +9,9 @@
 		anchorY: 0.5
 	});
 	self.gravity = 0.5;
 	self.lift = -10;
-	self.velocity = 5;
+	self.velocity = 8;
 	self.update = function () {
 		self.velocity += self.gravity;
 		self.y += self.velocity;
 		if (self.y > 2732 - birdGraphics.height / 2) {