More than 4 players

[LB]

Bouncing ball, I believe would be your best bet.

Most defenatly. I've done this before, it works becuase the bouncing ball movement does not have to bounce at all. It can even be used for scrolling. Simply set the direction and speed with the player button presses, and the decelaration is built in changable... accelaration I think you have to do manually.

[Bugsey]

Make it an On-line Multiplayer Game, i guess.