Conflict: Desert Storm 2 - Back To Baghdad

Cheat mode:
Go to the main menu, and press the following key combination:
Square, Square, O, O, L1, L1, R1, R1, L2, L2, R2, R2
Begin the game after pause the game play, then jump to the options.
The "Cheats" selection should be unlocked in the options menu.

Extreme mode:
Finish the game in hard mode

You need an USB keyboard to activate the following functions.
During gameplay press the indicated button:

Damage: press K
Display your position and rotation: press L
Reverse aiming: press Y.
Pause: press X, press Start to continue
Display menu: press -