Battle Mode: players will select from six ways to thrash their rival buddies: Knockout, Ring Battle, Race, King of the Hill, Capture the Chao, and Tag. Single Disc Game Sharing: two players will easily access the Multiplayer challenge with just a single disc using the wireless function. Intriguing New Storyline: the Chao seem to be disappearing and all eight rivals must work fast to find out who is behind it. Three New Playable Characters: Miles "Tails" Prower and two other new characters round out the cast of eight rivals. Free Play Mode: free from rivalry, the player can experience the challenging old-school Sonic-style map at their own pace!