RoboSumo is a physics-based fighting game with legless robotic punching machines!
The goal is to knock your opponent over, as you are disqualified as soon as any limb but your arms hit the ground.
The current version includes a standard match versus an AI, a cool custom color for your robot, a robotic crowd, a training mode where you beat a helpless punching bag to practice your swings, a multiplayer mode over the interwebs, and no legs.
(Multiplayer is in beta! although it seems to work, occasional problems may occur)