Level SelectAt the Cheats screen, press Circle, X, Square, Square, X, Square, Circle.InvincibilityAt the Cheats screen, press L1, Square, Circle, Circle, Square, L1, L2.All WeaponsAt the Cheats screen, press R2, X, L1, Square, R1, Circle, L2.Infinite AmmoAt the Cheats screen, press L2, Circle, R2, Square, Circle, L2, R1.Double DamageAt the Cheats screen, press Square, Square, Square, Circle, Circle, Circle, X.Temporary InvincibilityAt the Cheats screen, press L1, L1, L1, L1, L1, L1, R2.InvisibilityAt the Cheats screen, press Square, X, Circle, Square, X, Circle, Square.Full EgoAt the Cheats screen, press R1, R1, Circle, Circle, L1, L1, R2.Full ArmorAt the Cheats screen, press L1, L1, R1, R1, X, X, Circle, Circle.First Person ViewAt the Cheats screen, press L2, R1, L1, R2, Circle, X, Square.Big Head DukeAt the Cheats screen, press Square, Square, X, Circle, Circle, X, Square.Small Head DukeAt the Cheats screen, press Square, X, Circle, Circle, X, Square, Square.Big Head EnemiesAt the Cheats screen, press X, X, R1, X, L1, X.Small Head EnemiesAt the Cheats screen, press X, L1, X, R1, X, X.Wacky FMV SequencesAt the Cheats screen, press L1, L2, R1, R2, Circle, Circle, Square, Square.Outtake FMV SequencesAt the Cheats screen, press L1, L2, R1, R2, Square, Square, Circle, Circle.Ending FMV SequenceAt the Cheats screen, press Circle, R2, L1, Square, L2, X, R2.Unlock All CheatsAt the Cheats screen, press L1, L2, R2, R1, L1, L2, R2, R1, L1, L2, R2, R1, L1, L2, R2, R1, Circle, Circle, Circle, Circle, X, X, X, X, Square, Square, Square, Square, Select, Select, Select, Select.
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Playstation 1 
