Big Head Mode
For the Big Heads code (single player only)
go to the Options Menu, click in bottom left
corner and type EGOTRIP.
Submitted by MMBKG@aol.com

Display Framerate
Start a game as normal, then press "Esc"
then click options. Click the lower-left
corner of the screen and then type
FRAMERATE to display the # of frames
per second.
Submitted by Pezasaur

Infinite Lives
Start a game as normal, then press "Esc"
then click options. Click the lower-left
corner of the screen and then type
BEEFCAKE for unlimited ammo.
Submitted by simond@idx.com.au

Unlimited Ammo
Start a game as normal, then press "Esc"
then click options. Click the lower-left
corner of the screen and then type SWEET
for unlimited ammo.
Submitted by simond@idx.com.au