Moto GP - Platform: XBox

Cheat mode:
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At the main menu, press Left, Up, Left(2), B, Up, Left(2), B, Y, Down, Up, B to 
unlock all tracks, riders, and unlockables in the game. Note: Use the Left 
Analog-stick to enter the directions.

Space Invaders mini-game:
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Enable the "Cheat mode" code, then select the Sheridan (training) track. Near 
the very sharp S turn is a path leading down into the basement of the large 
building (to your left). Once in the basement, you will find a brown arcade 
game. Hit it to play it. You can play the mini-game as many times as desired.

Fish Bouncer mini-game on Xbox Live!:
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At the main menu, press Left, Up, Left(2), B, Up, Left(2), B, Y, Down, Up, B. 
The object is to successfully "bounce" the fishes across the toxic pond. The 
scores you obtain are listed under your GamerTag on the Xbox Live! account.

Credit shooter mini-game on Xbox Live!:
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Watch the credits and at the end, you can play a Space Invader style game. The 
scores you obtain are listed under your GamerTag on the Xbox Live! account.

Easy unlockables on Xbox Live!:
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Have someone that already has the unlockables go into the lobby and send you an 
invite. Then, have them turn on the unlockables that you want. Exit the lobby 
and go to create a session. Save the game and it will have the selected 
unlockables.