This game is also available on PS2.
Retro Game Cheats for Sonic Gems Collection (Gamecube)
Effect: Sonic R - allows you to choose the same character.
When:
At the select character screen in multiplayer.
How:
In Multiplayer Mode, highlight the character you want that your friend has chosen. Hold L and press A or X and you can play as him/her as well!
Submitted By:
Effect: Unlocks "Sonic Adventure DX Artwork Set 1" in the museum.
Effect: Unlocks "Sonic R Artwork Set 1" in the Museum section.
Effect: Unlocks "Sonic Heroes Team Artwork set 2" in the Museum section.
Effect: Unlocks "Sonic CD Artwork Set 1" in the museum.
Effect: Unlocks "Sonic Heroes Team Artwork set 3" in the Museum section.
Effect: Sonic R - Unlock Super Sonic
Effect: Unlocks "Sonic Heroes Team Artwork set 1" in the Museum section.
Effect: Unlocks "Sonic Heroes Team Artwork set 4" in the Museum section.
Effect: Unlocks "Sonic Adventure DX Artwork Set 3" in the museum.
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