Make all cheats available on Cheats menu screen: enter FMNFB
Sent in by: Jamie F.

Big head mode:-  Enter HEID as a code at the cheat menu.

Invincibility - Enter EMERPUS as a code at the cheat menu screen.

All Weapons - Enter TEXAS as a code at the cheat menu screen. All weapons available in the current level will be unlocked.

Infinite ammunition - Enter MADMAN as a code at the cheat menu screen.

Select a level - Go to the Enter Cheat screen and enter SELLOUT for a code. Now you need to load a saved game to select the level

Be invisible - Go to the Enter Cheat screen and enter SLLEWGH for a code.

Demo mode - Enter HUNTER as a code at the cheat menu screen.
Sent in by Tony Green

Zoo mode  -  Enter ZOO as a code at the cheat menu. You will be able to kill any animal in the game with the war club as a weapon.