Codes
At pause screen press Select, Select, Circle, Circle to get cheat mode.
Then enter these codes to activate the following:
Full health
Triangle, Select
All weapons & 50 medkits
L1, L1, R1, R1
Beat current mission
Select, Circle
Ethereal mode
Triangle, Triangle, Triangle, Triangle
View all FMV sequences
L1, L1, L1, L1, L1, L1, L1.
Glitch
Select, Select, Circle, Circle.
Run Faster
At any time during the game, pause the game and enter this code: select, select, circle, circle, square, square, circle, circle.