During Gameplay, pause the game, and input the following codes:
Code                    Effect
Left,right,down,up,left,right.	Alternate Costume.
Up,up,left,right,up,down,left.	Big Heads.
Up,up,down,down,left,right.	Extra Credits (16,000).
Right,right,right,up,down,left.	IFF Glow.
Up,right,right,up,up,left.	Low Gravity.
Up,down,left,right,down,up.	No Clipping Mode.
Left,right,right,left,up,down.	No Target Mode.
Down,down,down,down,up,up.	Toggle Auto-Aim.


Passwords
Profile Easter Eggs

Rename your profile as follows: (THESE ARE CASE-SENSITIVE!)
Password                Effect
!!UNDONE!!              Makes most of the text in the game very shaky
PlumRugOfDoom           Makes the terrorists at Prodigy have a purple streak in their hair.