Great Escape, The Cheats

While you are driving the tank, you encounter another tank. You cannot fight; park somewhere safe and run into the house with the stairs. Go to one of the levers and pull it. You will see a train appear and hit the tank, clearing the path for you.

Level select
At the main menu, enter the following combo:
Square, L2, Square, R2, Circle, R1, Circle, L1, L2, R2, Circle, Square.
Infinite ammo and health
During gameplay, make sure you have a gun and health kit in your inventory then with the game paused, enter the following combo:
Square, Circle, L2, R1, R2, L1, Circle, Square, L1, R1, L1, R1.
The Greatest Escape mode
This mode is unlocked after you complete the game. This lets you play any level with a time limit. Alternatively the level select code usually unlocks this mode too.
Get all FMV sequences
At the main menu, entering the following combo:
L2, L1, Square, Circle, Circle, R2, R1, Square, Square, Circle, L1, R1.

Level Select
At main menu, press Square, L2, Square, R2, Circle, R1, Circle, L1, L2, R2, Circle, Square.

Unlimited Ammo
At main menu, press Square, Circle, L2, R1, R2, L1, Circle, Square, L1, R1, L1, R1.

Unlock All Movies
At main menu, press L2, L2, Square, Circle, Circle, R2, R1, Square, Square, Circle, L1, R1.

Frome the main menu, pressL2, L2, square, circle, circle, R2, R1, square, square, circle, L2, R1,

Beat the game one time

At the main menu press:
square,L2,square,R2,circle,R1,circle,L2,R2,circle,square. Two icons should show up.
One will say The Greatest Escape and one will say Level Select.