Cheat Mode

Pause, then press Select, Select, Circle, Circle. Then enter the codes.
Code Effect
Down, Down, Up
Minimum health
L1, L1, Circle, L1, L1
Level Select
L1, L1, L1, L1, L1, L1, L1
All FMVs
L1, L1, R1, R1
All weapons & 50 medkits
L2, R2, L2
Debug mode
Left, Right, Select
HUD Toggle
R2, L2, R2
Disable Debug mode
R2, R2
Toggle spy camera
Select, Circle
Beat current mission
Select, Selcet, Triangle, Triangle
Freeze all objects
Select, Select, Circle, Circle
Toggle light source
Select, Select, R1, R1
Remove fire
Square, Square, Circle, Circle
Run faster
Square, Triangle, Square
Exit door any time
Triangle, Select
God mode
Triangle, Triangle, Square, Square
View boundaries
Triangle, Triangle, Triangle, Triangle
Ethereal mode
Up, Up, Down
Maximum health