Enter these codes when you are asked to enter your name.

IAMGARYPENN
Extra swearing version
IAMNOTGARYPENN
Swearing off
HEARTOFGOLD
All cut-scenes viewable
ITSGALLUS
Allow access to every city and every level.
IAMTHELAW
No police
ITCOULDBEYOU
Gives 999999999 points
SUCKMYROCKET
All weapons, armour, and a 'Get Out Of Jail Free' card
ITSTANTRUM
Unlimited lives
HATEMACHINE
Increase point values
BUCKFAST
Press the '*' on the NUMPAD for all the weapons
PORKCHARSUI
Diagnostic mode