Sonic Rivals 2 - Sony PSP The Chao seem to be disappearing and all eight rivals must work fast to find out who is behind it! Players will select from six ways to thrash their rival buddies - Knockout, Ring Battle, Race, King of the Hill, Capture the Chao, and Tag. Two players will easily access the Multiplayer challenge with just a single disc using the Wi-Fi function. Three new playable characters, Miles Tails Prower, Espio the Chameleon, and Rouge the Bat round out the cast of eight rivals. Free from rivalry, the player can experience the challenging old-school Sonic-style map at their own pace!