Rivalry At Its Fastest! Compete head-to-head against Sonic's toughest rivals, or against your friends in wireless multiplayer mode in this high-stakes competition created exclusively for the PSP system. Head To Hedgehog! Move your feet or be defeated in an all-new race with 8 Rivals, 12 new courses, and unlimited speed. Battle your friends in 6 multiplayer modes or leisurely explore the courses via free play mode.