Quake 2 cheats and cheat codes for Playstation

God mode:
Pause the game play and press L2, L2, R1, R2, R1, L2 buttons to
become invincible.

Easy mode completion bonus:
Finish the game in easy mode then save to get access to
"Weapons Stay" and "One Hit Kill" options for multi-player mode.

Medium difficulty completion bonus:
Finish the game on medium difficulty level then save to get access to
the "Blast Force", "Game Speed", "Weapons Stay" and "One Hit Kill"
options for multi-player mode.

Hard mode completion bonus:
Finish the game on hard mode then save to get access to the
"Unlimited Ammo", "All weapons", "Blast Force", "Game Speed",
"Weapons Stay" and "One Hit Kill" options for multi-player mode.