Enter the following codes at the cheat page:
All weapons - R2, X, L1, Square, R1, Circle, L2
Big head Duke - Square(x2), X, Circle(x2), X, Square
Big head enemies - press X(x2), R1, X, L1, X
Double damage - Square(x3), Circle(x3), X
First person view - L2, R1, L1, R2, Circle, X, Square
Full armor - L1(x2), R1(x2), X(x2), Circle(x2)
Full ego - press R1(2), Circle(x2), L1(x2), R2
Infinite ammunition - L2, Circle, R2, Square, Circle, L2, R1
Invincibility - L1, Square, Circle(x2), Square, L1, L2
Invisibility - Square, X, Circle, Square, X, Circle, Square
Level select - Circle, X, Square(x2), X, Square, Circle
Small head Duke - Square, X, Circle(x2), X, Square(x2)
Small head enemies - X, L1, X, R1, X(x2)
Temporary invincibility - press L1(6), R2
and finally...
Unlock all cheats - L1, L2, R2, R1, L1, L2, R2, R1, L1, L2, R2, R1, L1, L2, R2, R1, Circle(x4), X(x4), Square(x4), Select(x4)
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