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Complete the game with Sonic, Knuckles, Silver, and Shadow. Unlockable: Secret Forms Chaos Zero - Get every card in the game. Metal Sonic (2nd form) - Complete Metal Sonics storyline, and get the Metal Madness, Metal Overlord, and Neo Metal Sonic cards. Super Shadow - Unlock all of Shadows suits, complete his storyline, and beat all of the challenges as Shadow. Super Silver - Unlock all of Silvers suits, complete his storyline, and beat all of the challenges as Silver. Super Sonic - Unlock all of Sonics suits, complete his storyline, and beat all of the challenges as Sonic. Tikal - Unlock all of Knuckle’s suits, complete his storyline, and beat all of the Colosseum Highway challenges as Knuckles.  
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