1. Turn on your PlayStation with Quake II in the tray.
2. Beat the game on easy difficulty to unlock two new options for multi-player mode: weapons stay mode and one hit kill mode.
3. Beat the game on medium difficulty to open two more bars in multi-player mode: Game Speed and Blast Force. It will also give you the multi-player modes in step two.
4. Beat the game on hard difficulty to get infinite ammo and all the weapons. You will also get all of the multi-player modes listed in steps two and three.
