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Successfully complete the game as Sonic, Knuckles,
Silver, and Shadow.
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Alternately, collect the "Metal Madness", "Metal
Overlord", and "Neo Metal Sonic" cards.
Successfully complete story mode as Knuckles, Metal
Sonic, Shadow, Silver, or Sonic to unlock the corresponding menu
Knuckles' leather shoes
To get Knuckles' leather shoes, get Coconut 2002, Turtloids
2002, and Buzzer 2002.
Shadow's flame suit
Get the cards Team Sonic, Team Rose, and Team Dark.
Silver's leather shoes
To get Silver's leather shoes, get the card Chaos 2
(1998), Chaos 4 (1998), and Chaos 6 (1998).
Sonic's ice suit
To get Sonic's ice suit you must have Miles "Tails"
Power 2004, 2005, and 2002.
Sonic's leather costume
To get Sonic's leather suit, get the card Sonic The
Hedgehog, Sonic The Hedgehog 2, and Sonic The Hedgehog 3. To get
the gloves, get Cream The Rabbit, Cheese, and Cream and Cheese.
To get the shoes, get Sonic and Amy, Amy Rose 2005, and Amy Rose
Cup Circuit mode cups
Successfully complete the easy, medium, and hard challenges in the indicated zones in Challenge mode to unlock the corresponding Cup Circuit mode cup.
- Blue Chaos Cup: Death Yard Zone
- Cyan Chaos Cup: Colosseum Highway Zone
- Green Chaos Cup: Forest Falls Zone
- Grey Chaos Cup: Complete every challenge in the game
- Purple Chaos Cup: Meteor Base Zone
- Red Chaos Cup: Sky Park Zone
- Yellow Chaos Cup: Crystal Mountain Zone
Strategy guides from GameFAQs