Quake 3 Revolution

Level Skip:
Hold R1 + R2 + L1 + Select, and press X, Circle, Square, Triangle, X, Circle, Square,
Triangle during the game. You will automatically win the match.

Pause in multi-player mode:

Since the game does not have a pause option in the multi-player mode, simply press Start , highlight "Quit" and press X. Your game will be paused, but it will not quit unless you select "Yes". To resume the game, choose "No".

Skip Level:

During gameplay HOLD R1 + R2 + L1 + Select and press X, Circle, Square, Triangle, X, Circle, Square.

Unlock two more characters in arena mode:

Start or continue a campaign. Beat vadridgar (i think that's his name) the arena master for the second time. Then win the next match and you will have two new characters in arena mode.

Find the kamikaze:

On the level "the forgotten place" there is a patch in wall that is boarded up a little bit, it looks like someone has blown a hole in it and someone else had patched it up. Use any gun (except the "gauntlet") and shoot the wall to reveal a hole then walk inside. To you're left should be the Kamikaze, pick it up and press square to obliterate yourself and your opponents.

Unlimited Quad Damage:

When you first start enter your name as "HAT_TRICK" and you will have unlimited Quad Damage through the whole game!