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Level skip
While playing a game, hold L1 + R1 + R2 + Select and press X, Circle, Square, Triangle, X, Circle, Square, Triangle.
Submitted by: Tabari

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, select "No".
Submitted by: Tabari

Rocket jump:
Pick up a Rocket Launcher and switch to it, then point your gun straight down. Jump, and when you are at your highest point, quickly fire the Rocket Launcher. If done correctly, your character will go high in the air. Note: You will most likely lose a little bit of health while doing this, so be careful.

BFG jump
This works similarly to the rocket jumpm except it sends you higher. Aim the BFG at the ground, jump, and at the highest point of the jump, shoot down. You will rocket into the air. Note: You will get hurt slightly. If done on a spring pad, you will jump higher.

Special item
If you hear a sound similar to the wind during game play, this is a sign that one or more special items have just appeared. Special items include Quad Damage, Double Damage, Haste, Double Haste, Invincibility, Mega Health, etc.

Beat the final Boss
Use the BFG to take out the projectors. Watch out for his plasma gun. After they are destroyed, he will jump down. When he does, run to the bottom of the level and go into one of the two tunnels. One will have a chaingun and armor and the other will have the rocket launcher and health. He does not go in those. He just runs around outside gaining (and losing) health. Use the chaingun with zoom. Keep shooting until he is almost dead and transports to the platform again. Run out and go up the stairs in a circle and get the railgun. Then, go in a tunnel and snipe him. He should explode, unlocking a new level. Complete the new level to unlock two new characters for arena and a new level.

Bonus characters and level:
Successfully complete the game in campaign mode under the "I Can Win" difficulty setting. A bonus level and two more characters will appear after the credits. Successfully complete the bonus level to unlock it and the new characters in multi-player mode.