This game is also available on PS2.
Retro Game Cheats for Sonic Gems Collection (Gamecube)
Effect: Sonic R - Unlock Metal Sonic
When:
During the game
How:
Get all of the tokens in Resort Island. And then finish in 3rd place or above and beat Metal Sonic.
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Effect: Unlocks "Sonic The Fighters Artwork Set 2" in the museum.
Effect: Sonic CD - Game over without dying
When:
During gameplay
How:
During the game do not press any button for 3 minutes. Sonic will then say "I'm outta here" and it will be game over.
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Effect: Picture of Tails besides a green car AND debug mode.
When:
During the sound test mode
How:
Enter this code: PM 12 DA 11, into the sound test menu ans you'll see an image of Tails besides a green car. Exit and start the game and you'll now be in debug mode.
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Effect: Unlocks the Hints menu
When:
N/A
How:
Open a game of your choice. Leave it running for 3 hours (you don't have to play it). Exit and when you re-enter the game the hints menu can be accessed. Hints can also now be found in the Extras area.
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Effect: Sonic CD - Level Select
When:
At the "Start Game" screen
How:
At the start game screen tap (do not hold) on the D-pad: Up, Down, Down, Left, Right, A. You'll now be sent to the level select screen. Note: Level select only enables you to practice and once finished you go back to the start menu.
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Effect: Human sonic picture
When:
During the sound test mode
How:
Enter this code: PM 12 DA 25, into the sound test menu and you'll get an image of a human like sonic complete with a Japanese message.
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Effect: Sonic R - Unlock Dr. Eggman
Effect: Sonic R - Unlock Tails Doll
When:
During the game.
How:
Get all of the tokens in Radical City. And then finish in 3rd place or above and beat Tails Doll.
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Effect: Unlocks "Sonic Adventure DX Artwork Set 2" in the museum.
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