Necrodome

Press [T] before all codes for the text box:
excalibur       - all weapons
smallrocks       - full ammo
verysmallrocks   - neverending 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         - Invincible
coconuts       - Linear Movement (Weird!)
grail         - gives you the arena flag
camelot         - conquers arena
gimmesomesugarbaby - all weapons and gear
alreadygotone     - all arenas become available
antioch         - kills all opponents