US Patent 7893646 Game system with robotic game pieces

A game system comprises a game board having a playing area and game pieces for playing a game on the game board. Each game piece comprises a mobile robot for sensing and decoding a position-coding pattern printed on the game board. Each game piece is in communication with a computer system. The computer system is configured to send instructions for moving each game piece relative to the playing area in response to position information corresponding to the game pieces.