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Sony PSP - Every Extend Extra cheats

Unlock Boss Attack mode:
Finish the Arcade mode to access to Boss Attack mode.

Unlock Caravan mode:
Finish Arcade mode to unlock Caravan mode, which will enable 
to play specific levels.

Unlock Stage Alpha:
Achieve a "C" or lower rating in all Arcade mode levels.

Unlock Stage Omega:
Achieve an "A" or higher rating in all Arcade mode levels.