Moto GP Unlockables

See 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.

Have a person which is already in possession of 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 you will have those particular unlockables.

Upon enabling the  MASTER CODE pick 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.