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Playstation - Quake 2 cheats

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.