Type these in during play to get the following:

BREAKYOSAK=Shotgun Shells
CARRYMOREºckpack (to carry more ammo)
CROTCHBOMB=Landmines
DAWHOLEENCHILADA=Flamethrower,Napalm,Grenades and Missiles
EXPLODARAMA=Exploding weapons & ammo
FIREHURLER=Flamethrower
FLAMENSTEIN=Flamethrower,Napalm,Molotov cocktails
GIMMEDAT=Gives All Weapons
HEALTHFUL=Full Health
HESSTILLGOOD=Resurrection
IAMSOLAME=Invincibility
LOBITFAR=Grenades,Molotov cocktails
MYTEAMOUSE=Character says "Do it for the gipper"
SHELLFEST=Rapid-fire Spray Cannon & ammo
SHOTGUN=More Shotgun ammo
STERNOMAT=Napalm ammo
THEBESTGUN=Rapid-fire Spray Cannon
THERESNOPLACELIKEOZ=Skip Level
THICKSKIN=Bullet-proof vest
TITANIII=Both kinds of Missiles