Cheats for Alien Versus Predator: Extinction on PS2.
Unlock Cheats menu:
Pause the game and press:
R1, R1, L1, R1, L1, L1, R1, L1, R1, R1, L1, R1, L1, L1, R1.
If you entered the cheat correctly you will hear a sound. Now at the pause menu go to Options and you will find a new Cheats section, including cheats such as clear fog of war, enable all levels, a money cheat and more.