Thetaball is an authentic digital sport with challenging, physics-based gameplay and lifelike AI. Each of the game's 256 robotic players is a distinct individual, created by a process of simulated evolution; because the bots have co-evolved within a complex physical environment -- both cooperating with and competing against one another -- their behaviors are diverse, robust, and lifelike. The end result is a game with all the challenge and re-playability of a real-world