Unlock Metal Sonic:
Finish the game as Sonic, Knuckles, Silver, and Shadow to unlock Metal Sonic.
or
Pick up th "Metal Overlord", "Metal Madness" and "Neo Metal Sonic" cards.
Unlock Yellow Chaos circuit mode cup:
Finish the easy, medium, and hard challenges in the Crystal Mountain
Zone in Challenge mode.
Unlock Red Chaos circuit mode cup:
Finish the easy, medium, and hard challenges in the Sky Park Zone in
Challenge mode.
Unlock Purple Chaos circuit mode cup:
Finish the easy, medium, and hard challenges in the Meteor Base Zone
in Challenge mode.
Unlock Grey Chaos circuit mode cup:
Finish all challenge in the game
Unlock Green Chaos circuit mode cup:
Finish the easy, medium, and hard challenges in the Forest Falls Zone
in Challenge mode.
Unlock Cyan Chaos circuit mode cup:
Finish the easy, medium, and hard challenges in the Colosseum Highway
Zone in Challenge mode.
Unlock Blue Chaos circuit mode cup:
Finish the easy, medium, and hard challenges in the Death Yard Zone in
Challenge mode.
Get Silver's leather shoes:
Have the card Chaos 2 (1998), card Chaos 4 (1998), and card Chaos 6 (1998).
Get Knuckles' leather shoes:
Have Coconut 2002, Turtloids 2002, and Buzzer 2002.
Get Sonic's ice suit:
Have Miles "Tails" Power 2004, 2005, and 2002.
Unlock menu skins:
Finish story mode as Knuckles, Metal Sonic, Shadow, Silver, or Sonic.
Sonic's leather costume:
Have the card Sonic The Hedgehog, Sonic The Hedgehog 2, and Sonic The
Hedgehog 3.
Gloves:
Have Cream The Rabbit, Cheese, and Cream and Cheese.
Shoes:
Get Sonic and Amy, Amy Rose 2005, and Amy Rose 2004.
