Various Cheats
     At the Enter Cheat screen, enter any of the following "Codes":

Code                    Effect 
SELLOUT                 Level Select (Load a saved game) 
EMERPUS                 Invincibility 
SLLEWGH                 Invisibility 
TEXAS                   All Weapons 
MADMAN                  Infinite Ammo
FMNFB                   All Cheats 
SLLEWGH                 Invisibility 
HEID                    Big Head Mode 
ZOO                     Zoo Mode 
HUNTER                  Demo Mode and Target Mini Game