QUAKE II UNLOCKABLES
Easy difficulty bonus
Finish and save the game under the easy difficulty to unlock the "One Hit Kill" and "Weapons Stay" options for multi-player mode.
Medium difficulty bonus
Finish and save the game under medium difficulty to unlock the "Game Speed", "Blast Force", "One Hit Kill" and "Weapons Stay" options for multi-player mode
Hard difficulty bonus
Finish and save the game under the hard difficulty setting to unlock the "Unlimited Ammo", "All weapons", "Game Speed", "Blast Force", "One Hit Kill" and "Weapons Stay" options for multi-player mode