/**** 
* Classes
****/ 
//<Write imports for supported plugins here>
// Character class with gravity and jump functionality
var Character = Container.expand(function () {
	var self = Container.call(this);
	var characterGraphics = self.attachAsset('character', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocityY = 0;
	self.gravity = 0.3;
	self.jumpStrength = -12;
	self.update = function () {
		self.velocityY += self.gravity;
		self.y += self.velocityY;
		// Prevent character from falling through the ground
		if (self.y > 2732 - 100) {
			self.y = 2732 - 100;
			self.velocityY = 0;
		}
	};
	self.jump = function () {
		// Allow jump even if in the air
		self.velocityY = self.jumpStrength;
	};
});
// Tube class with a medium velocity moving to the left and spawning on top and bottom
var Tube = Container.expand(function () {
	var self = Container.call(this);
	var tubeGraphics = self.attachAsset('tube', {
		anchorX: 0.5,
		anchorY: 0.5,
		width: 300,
		height: Math.floor(Math.random() * (4200 - 400 + 1)) + 400
	});
	self.velocityX = -2;
	self.update = function () {
		if (self.x < -200) {
			self.x = 2048 + 100;
			tubeGraphics.height = Math.floor(Math.random() * (3900 - 400 + 1)) + 400;
		}
		self.x += self.velocityX;
		// Respawn tube on the right side of the screen when it goes off the left side
		if (self.x < -200) {
			self.x = 2048 + 200;
			// Spawn tube only on the bottom
			self.y = 2732 - 150;
			// Change tube height to random values between 4200 and 400
			tubeGraphics.height = Math.floor(Math.random() * (3900 - 400 + 1)) + 400;
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000 //Init game with black background 
});

/**** 
* Game Code
****/ 
// Initialize assets used in this game.
// Create and position the character in the middle of the screen
var character = game.addChild(new Character());
character.x = 2048 / 2;
character.y = 2732 / 2;
// Create and position the sky at the top of the screen
var sky = LK.getAsset('sky', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2,
	y: 5
});
game.addChild(sky);
// Create and position the ground at the bottom of the screen
var ground = LK.getAsset('ground', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2,
	y: 2732 - 5
});
game.addChild(ground);
// Create and position the tube off the right side of the screen
var tube = game.addChild(new Tube());
tube.x = 2048 + 50;
tube.y = 2732 - 150;
// Handle touch events to make the character jump
game.down = function (x, y, obj) {
	character.jump();
	character.rotation = 0.2;
	LK.setTimeout(function () {
		character.rotation = 0;
	}, 200);
};
// Update game state every tick
game.update = function () {
	character.update();
	for (var i = 0; i < 5; i++) {
		tube.update();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -34,9 +34,9 @@
 		anchorY: 0.5,
 		width: 300,
 		height: Math.floor(Math.random() * (4200 - 400 + 1)) + 400
 	});
-	self.velocityX = -3;
+	self.velocityX = -2;
 	self.update = function () {
 		if (self.x < -200) {
 			self.x = 2048 + 100;
 			tubeGraphics.height = Math.floor(Math.random() * (3900 - 400 + 1)) + 400;