/**** 
* Classes
****/ 
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -40;
	self.update = function () {
		self.x += self.speed;
	};
});
var Cactus = Container.expand(function () {
	var self = Container.call(this);
	var cactusGraphics = self.attachAsset('cactus', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -40;
	self.update = function () {
		self.x += self.speed;
	};
});
var Dino = Container.expand(function () {
	var self = Container.call(this);
	var dinoGraphics = self.attachAsset('dino', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 2,
		scaleY: 2
	});
	self.speed = 0;
	self.gravity = 2;
	self.jumpStrength = -50;
	self.isJumping = false;
	self.update = function () {
		if (self.isJumping) {
			self.speed += self.gravity;
			self.y += self.speed;
			if (self.y > 2732 - dinoGraphics.height) {
				self.y = 2732 - dinoGraphics.height;
				self.speed = 0;
				self.isJumping = false;
			}
		}
	};
	self.jump = function () {
		if (!self.isJumping) {
			self.isJumping = true;
			self.speed = self.jumpStrength;
		}
	};
});
var DoubleCactus = Container.expand(function () {
	var self = Container.call(this);
	var cactusGraphics1 = self.attachAsset('cactus', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var cactusGraphics2 = self.attachAsset('cactus', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: cactusGraphics1.width
	});
	self.speed = -40;
	self.update = function () {
		self.x += self.speed;
	};
});

/**** 
* Initialize Game
****/ 
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
// Dino class representing the player character
var game = new LK.Game({
	backgroundColor: 0x87CEEB
});

/**** 
* Game Code
****/ 
var dino = game.addChild(new Dino());
dino.x = 400; // Move the Dino character to the right
dino.y = 2732 - dino.height + 100;
var obstacles = [];
game.update = function () {
	if (LK.ticks % Math.floor(Math.random() * 120) == 0) {
		var obstacle;
		var obstacleType = Math.random();
		if (obstacleType < 0.33 || LK.getScore() < 100) {
			obstacle = new Cactus();
			obstacle.y = 2732 - obstacle.height;
		} else if (obstacleType < 0.66) {
			obstacle = new Bird();
			obstacle.y = 2732 - obstacle.height - 400;
		} else {
			obstacle = new DoubleCactus();
			obstacle.y = 2732 - obstacle.height;
		}
		obstacle.x = 2048;
		obstacles.push(obstacle);
		game.addChild(obstacle);
	}
	for (var i = obstacles.length - 1; i >= 0; i--) {
		if (obstacles[i].x < -obstacles[i].width) {
			obstacles[i].destroy();
			obstacles.splice(i, 1);
		} else if (dino.intersects(obstacles[i])) {
			LK.showGameOver();
		}
	}
	if (LK.ticks % 7 == 0) {
		LK.setScore(LK.getScore() + 1);
		scoreTxt.setText(LK.getScore());
	}
};
var scoreTxt = new Text2('0', {
	size: 150,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
game.down = function (x, y, obj) {
	dino.jump();
};

===================================================================
--- original.js
+++ change.js
@@ -52,8 +52,24 @@
 			self.speed = self.jumpStrength;
 		}
 	};
 });
+var DoubleCactus = Container.expand(function () {
+	var self = Container.call(this);
+	var cactusGraphics1 = self.attachAsset('cactus', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	var cactusGraphics2 = self.attachAsset('cactus', {
+		anchorX: 0.5,
+		anchorY: 0.5,
+		x: cactusGraphics1.width
+	});
+	self.speed = -40;
+	self.update = function () {
+		self.x += self.speed;
+	};
+});
 
 /**** 
 * Initialize Game
 ****/ 
@@ -71,16 +87,20 @@
 dino.x = 400; // Move the Dino character to the right
 dino.y = 2732 - dino.height + 100;
 var obstacles = [];
 game.update = function () {
-	if (LK.ticks % 120 == 0) {
+	if (LK.ticks % Math.floor(Math.random() * 120) == 0) {
 		var obstacle;
-		if (Math.random() < 0.5 || LK.getScore() < 100) {
+		var obstacleType = Math.random();
+		if (obstacleType < 0.33 || LK.getScore() < 100) {
 			obstacle = new Cactus();
 			obstacle.y = 2732 - obstacle.height;
-		} else {
+		} else if (obstacleType < 0.66) {
 			obstacle = new Bird();
 			obstacle.y = 2732 - obstacle.height - 400;
+		} else {
+			obstacle = new DoubleCactus();
+			obstacle.y = 2732 - obstacle.height;
 		}
 		obstacle.x = 2048;
 		obstacles.push(obstacle);
 		game.addChild(obstacle);