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.