Enter the codes quickly at the Press Start screen.
Cheat mode:
Triangle, Square, Circle, Left, Square, Triangle, Square, Circle, Left, Square.
Stage select:
Left, Right, X, Triangle, Left, Up.
Grayscale graphics:
X, X, Triangle, Triangle, Square, Square, Circle, Circle, Up, Down.
Sepia graphics:
Left, Left, Left, Left, Left, Left, Left, Left, Left, Left.
Big head player:
Square, Circle, Circle, Square, Up, Square, Circle, Circle, Square, Triangle.
Big Head aliens:
Square, Circle, Circle, Square, Up, Square, Circle, Circle, Square, X.
Nakomi mode:
Up, Up, Down, Down, Left, Right, Left, Right, X, Circle.
Turbo mode:
X, Square, Triangle, Circle, X, Square, Triangle, Circle, L2, R2.
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Assault: Retribution Cheats, Codes & Walkthrough/Guide/FAQ for PlayStation from Cheat Code Central
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