When entering outside space, or Chukie's World, enter the following code on the first level: X, X, X, O, O, O, X, X, O, X and you should geta jet pack. Note: This may take several attemps.
Begin game play in the Tag Race or any Diapies Of Thunder level. Press Start to pause game play, then press Circle, Square, Circle, X.
Get 50 Reptar Bars to get a key without first completing a level.
Successfully complete the game in single player mode. A bonus level will be unlocked in Diapies Of Thunder mode.
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