Enter the Options menu and enter the Passwords option. Enter ENTREZVOUS as a password. Highlight and click 'send.' Re-enter the Passwords option and enter PORTECLEFS as a password and send. Enter the Passwords option one more time and enter LEMONSTRE as a password and send. Highlight and select Secret Codes and enable Invincibilty and Unlimited Ammo. You will now have infinite health and ammo for the whole game and the secret mission 'Panzerknacker Unleashed.'