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XBox - Xbox Live Arcade cheats

Type these cheat codes at the level selection screen:

Unlock all levels
Press the following button combinations on your Xbox controller while you 
are at the level selection screen: Left Trigger, Up, Down, Right Trigger, X
Now you have access to all levels.

Extra stage for current level:
Press the following button combinations on your Xbox controller while you 
are at the level selection screen: Right Trigger, X, Y, Down, Right Trigger