Tap the screen to impulse the circle. Please drive it to the target and collect stars as many as possible. You can control the force by adjusting the distance from the circle. The circle will be disabled after a tap, and you cannot control it anymore. The circle will be activated again when it hits something. So please control your circle carefully. You will encounter innumerable elements, like machine arm, anti-gravity bubble, transportation doors, forbidden area etc. Enjoy the game, you'll love it.