Cheats:

 To enter teh following codes press [T] to get to the text box. Here
 you could type in:

 excalibur          - All weapons
 smallrocks         - Full ammo
 verysmallrocks     - Unlimited ammo
 shrubbery          - All gear (health kits, napalm, etc.)
 swallow            - Full tank of gas
 unladenswallow     - Bottomless tank of gas
 rabbit             - Shields recharged
 igotbetter         - Health recharged
 knight             - Invincibility
 coconuts           - Linear movement
 grail              - gives you the arena flag
 camelot            - conquers arena
 gimmesomesugarbaby - all weapons and gear
 alreadygotone      - all arenas become available
 antioch            - kills all opponents