Quake III Revolution
While playing on any stage HOLD L1+R1+R2+Select then while holding PRESS X,Circle,Square,Triangle,X,Circle,Square,Triangle.
Contributed By: Greiver.
Bonus Characters and Level
Successfully complete Campaign mode under the ''I can win'' difficulty setting and after the credits A bonus Level and 2 more Characters will appear. Successfully complete the bonus level to unlock the bonus level and the 2 Characters to play as in 2 player mode.
Contributed By: STEVEW.
Infinite time against the Vadrigar
In stage 5:5, the level with the final boss "The Vadrigar", the game tells you that you have a time limit of 15 minutes. This is actually not true. Even when the timer hits 15 minutes the game keeps going, allowing you as much time as you need to beat him.
Contributed By: Shinmen Musashi.