A sorceress named Merlina, granddaughter of the original Merlin, summons Sonic to help free the mystical realm of King Arthur, who has been possessed by an unknown evil that, according to Nintendo Power, comes from his scabbard, (this follows the traditional King Arthur story in which his scabbard is the source of his sword's power), and is now ruling the realm as the tyrannical Black Knight. Sonic's speed alone will not end The Black Knight's reign, so he must take up the sword in order to break Arthur's curse and save the kingdom.
* Intense sword-wielding action: For the first time ever, players can vanquish their foes using lightning-fast sword combos.
* Thirteen interactive environments set in the world of King Arthur: Players can jump onto a giant crossbow to propel themselves over moats, scale castle walls and prepare to meet surprising new creatures and enemies.
* Upgradable attacks and power moves: As players progress they can level up and gain access to special attacks and powers geared to fit their preferred style of gameplay.
* Multiplayer sword battles: Playing as one of four familiar characters from the Sonic universe, gamers can duke it out against up to three other players.
Works through backup loader error 002 fix, tested on a pal console.