/**** 
* Classes
****/ 
var Dinosaur = Container.expand(function () {
	var self = Container.call(this);
	var dinosaurGraphics = self.attachAsset('dinosaur_image', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.jumpSpeed = 0;
	self.isJumping = false;
	self.update = function () {
		if (self.isJumping) {
			self.y += self.jumpSpeed;
			self.jumpSpeed += 1;
			if (self.y >= 2732 / 2) {
				self.y = 2732 / 2;
				self.isJumping = false;
			}
		} else {
			// No gravity when the dinosaur is not jumping
			if (self.y > 2732 / 2) {
				self.y = 2732 / 2;
			}
		}
	};
	self.jump = function () {
		if (!self.isJumping) {
			self.isJumping = true;
			self.jumpSpeed = -30;
		}
	};
});
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleGraphics = self.attachAsset('obstacle_image', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -10;
	self.update = function () {
		self.x += self.speed;
	};
});

/**** 
* Initialize Game
****/ 
//<Write imports for supported plugins here>
var game = new LK.Game({
	backgroundColor: 0x000000 //Init game with black background 
});

/**** 
* Game Code
****/ 
var dinosaur = game.addChild(new Dinosaur());
dinosaur.x = 2048 / 4;
dinosaur.y = 2732 / 2;
var obstacles = [];
for (var i = 0; i < 5; i++) {
	var obstacle = game.addChild(new Obstacle());
	obstacle.x = 2048 + i * 500;
	obstacle.y = 2732 / 2;
	obstacles.push(obstacle);
}
game.down = function (x, y, obj) {
	dinosaur.jump();
	dragNode = dinosaur;
};
game.move = function (x, y, obj) {
	if (dragNode) {
		dragNode.jump();
	}
}; //{new_code}
game.up = function (x, y, obj) {
	dragNode = null;
	dinosaur.isJumping = false;
}; //{new_code}
var dragNode = null;
game.update = function () {
	dinosaur.update();
	for (var i = 0; i < obstacles.length; i++) {
		obstacles[i].update();
		if (obstacles[i].x < -100) {
			obstacles[i].x = 2048 + Math.random() * 500;
		}
		if (dinosaur.intersects(obstacles[i])) {
			LK.showGameOver();
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -17,10 +17,9 @@
 				self.y = 2732 / 2;
 				self.isJumping = false;
 			}
 		} else {
-			// Add gravity when the dinosaur is not jumping
-			self.y += 5;
+			// No gravity when the dinosaur is not jumping
 			if (self.y > 2732 / 2) {
 				self.y = 2732 / 2;
 			}
 		}