Think LightCycles? from Tron. Think OpenGL. Highly addicting, and has been known to produce chronic twitching.
Actually, while arguably the best looking
version of tron available, it can hardly be called the most playable
incarnation to date. If you find the game interesting, but find yourself cursing the gameplay, you may want to look around for a better version on a platform near you.
As a matter of fact, it's pretty simple to make a Light Cycle-Type game on many graphing calculators... Any of the TI's modern enough to include a PtChg? command, pretty much.