GameCube
Get Big Head Mode
Go to the main menu and press R, R, L, R
GameCube
Pick Level
Go to the main menu and press X, Y, Z, Z, X, Y, Z, Z
GameCube
Enemies Punched Are Set On Fire
Go to the main menu and press B, Y, L, L
GameCube
Bullets Explode
Go to the main menu and press L, R, Z, Y, B
GameCube
Be Invincible
Go to the main menu and press L, R, L, R, L, R, L, R
GameCube
Make Enemies Slower
Go to the main menu and press B, X, Y, Z, L, R
GameCube
Tiny Heads Mode
Go to the main menu and press L, L, R, L
GameCube
Super Tiny Heads Mode
Go to the main menu and press B, X, Y, B, X, Y
GameCube
Flames
Go to the main menu and press X, Y, B, X, Y, B
GameCube
Get Out of Prison
In the prison you have to get the cigarettes and take them to one of the other prisoners and he'll give you a lit cigarette and then go to the burnt mattress and light it on fire then run down to the guard's cell and hide in the locker. Then go out the other way (in stealth mode).
Submitted By jamie