Gravity Switch

重力开关是一种上瘾的游戏，切换白色立方体的颜色为黑色。

In space, there are millions of free balls, cubes and other obstacles of black and white color.

Your job is to finish black cube and switch them with white color.

How to play?

- Simply tap on screen white color cube will be fired.

- Tap smartly otherwise it could be fired in wrong direction.

- Once a black color is switched to white It can't be switched again.

- Remember you have limited time for each level.