Leather Shoes for Knuckles:
Aquire the Buzzer 2002, Coconut 2002, and Turtloids 2002 cards.
Secret Forms:
Get Chaos Zero - Acquire every card in the game.
Get Metal Sonic (2nd form) - Finish Metal Sonic's storyline, and acquire the Metal Madness, Metal Overlord, and Neo Metal Sonic cards.
Get Super Shadow - Acquire all of Shadow's suits, finish his storyline, and complete all of the challenges as Shadow.
Get Super Silver - Acquire all of Silver's suits, finish his storyline, and complete all of the challenges as Silver.
Get Super Sonic - Acquire all of Sonic's suits, finish his storyline, and complete all of the challenges as Sonic.
Get Tikal - Unlock all of Knuckle’s suits, complete his storyline, and beat all of the Colosseum Highway challenges as Knuckles.
Get Metal Sonic:
Finish Story Mode using any already acquired character.
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