Algodoo

Waring: Your enemise invite to yo play TaiJi.
You have tow choices: Quit, or dance with them.

You will control the black-red ball to move sharp and fast.
All your enemise are malicious but arrogant. Once two of them collide, the die together.
When they reach the grey edge or the center guarded by the 'boss', they die, too.
But once you collide with one of them, or hit the edge or the center, you fail.

Goal: Survive until all other balls die.
Notice: Only the center and your black-red ball are attraction sources.

(To kill the last 'boss' ball, I have tried several times, but succeeded only once)