Home: Game Cheats: Sony PSP

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All rides:
Press Square, Circle, Triangle, Square, Circle, Triangle(2) while in
any park.

All parks:
Press Square, Circle, Triangle, Square, Circle, Triangle, Square while
in any park.

Extra $50,000:
Press Square, Circle, Triangle, Square, Circle, Triangle, X while in
any park. 

Mission completion:
Press Square, Circle, Triangle, Square, Circle, Triangle, Circle while
in any park. Press Square at the mission selection screen to complete
the highlighted mission.