Level select
At the cheats screen, press
Circle, X, Square, Square, X, Square, Circle.
Invincibility
At the cheats screen, press
L1, Square, Circle, Circle, Square, L1, L2.
All weapons
At the cheats screen, press
R2, X, L1, Square, R1, Circle, L2.
Infinite ammunition
At the cheats screen, press
L2, Circle, R2, Square, Circle, L2, R1.
Double damage
At the cheats screen,
press Square, Square, Square, Circle, Circle, Circle, X.
Temporary invincibility
At the cheats screen, press
L1, L1, L1, L1, L1, L1, R2.
Invisibility
At the cheats screen, press
Square, X, Circle, Square, X, Circle, Square.
Full ego
At the cheats screen, press
R1, R1, Circle, Circle, L1, L1, R2.
Full armor
At the cheats screen, press
L1, L1, R1, R1, X, X, Circle, Circle.
First person view
At the cheats screen, press
L2, R1, L1, R2, Circle, X, Square.
Big head Duke
At the cheats screen, press
Square, Square, X, Circle, Circle, X, Square.
Small head Duke
At the cheats screen, press
Square, X, Circle, Circle, X, Square, Square.
Big head enemies
At the cheats screen, press
X, X, R1, X, L1, X.
Small head enemies
At the cheats screen, press
X, L1, X, R1, X, X.
Odd FMV sequences
At the cheats screen, press
L1, L2, R1, R2, Circle, Circle, Square, Square.
Ending FMV sequence
At the cheats screen, press
Circle, R2, L1, Square, L2, X, R2.
Unlock all cheats
At the cheats screen, press
L1, L2, R2, R1, L1, L2, R2, R1, L1, L2, R2, R1, L1, L2, R2, R1,
O, O, O, O, X, X, X, X, Square, Square, Square, Square, Select,
Select, Select, Select.