Invincibility:
Pause the game and press , , Left, Right, , .

Level Advance:
Pause gameplay Up, Down, Left, Right, Right, Left, . By performing this code you will instantly complete the level and charge on to the next.

Unlock Every Level:
To enable this code you must first play the game and create a save. From the Main Menu select Resume Game. On the Next screen highlight your save and enter the following code: Up, Down, Down, Up, Left, Up, Right, Down.

Skip Levels:
During gameplay, hit pause and press Up, Down, Left, Right, Right, Left, Circle.

Fatboy:
To unlock a new Mutator that makes you get fatter and fatter with every Frag, and skinnier and skinnier with every time you get Fragged, just perform the following code. At the Title screen enter: , , , Up, Down, Down, Up, , , . You can now go to Multiplayer Mode and there will be a new Mutator called Fatboy. Turn this Mutator on and enjoy the antics.

God Mode:
When paused, press , , Left, Right, .

All Ammo:
When paused, press: Left, Right, , , , Right, Left. (raises ammo stats to 999)

Unlock Big Head Mutator:
At the main menu, press Left, Right, Left, Right, Left, Right, , , Circle.

Unlock Stealth:
In the main menu press , , , , , , , Circle. All players are equipped with cloaking devices.

All Characters:
Press Start to pause the game, then press Left, Left, , , Right, Left, .

Thanks to Revolution readers Matt Ezarik, Matt "The Mauler" Mahler, Hunter Byington, rinaldo, Dave Cossey, Hugo Keijsers from the netherlands and Travis Mahler!