The gloves are off and Sonic and his rivals are gearing up for an intense new head-to-head competition exclusively on the PSP. This sequel to Sonic's 2D action-platformer features all-new 'jostling' controls for tighter competition and a brand new Battle mode allows two players to jump into six different multiplayer challenges by sharing one disc. With extra playable characters - including Miles 'Tails' Prower - 12 new stages and upgraded signature moves for each character, the enhanced Rivals experience brings a whole new level of handheld fun to the PSP. Special Features - * Battle Mode - Players 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 can easily access the multiplayer challenge with just a single disc using the Wi-Fi function.* Intriguing New Storyline - The Chao seem to be disappearing and all eight rivals must work fast to find out who is behind it.* New PlayableCharacters - Join Tails and two new characters for even more fast-paced action with your rivals.* Free Play Mode - Free from rivalry, experience the challenging old-school Sonic-style map at your own pace.* Expanded Card Collection - Collect 150 new cards for loads of new options to customise your playable characters.