I think the game is the hardest ,if you want to play it more you can buy the full version , i think you will never can play it to success,if not ,i think you will be best,if you want to get a challenge for you ,Buy it to play! Main flow: 1.Take the object to make the blue ball to catch the red ball,some iphone ui forum object can be used. 2.Don't use you mind with the ui forum to play it ,use the physics to play it!