Restore health:
Enter ImJackCarver as a case-sensitive code.

Unlimited ammunition:
Enter UnleashHell as a case-sensitive code.

Feral Attack in the early levels:
Enter FeralAttack as a case-sensitive code.

Unlimited Feral Attacks:
Enter Bloodlust as a case-sensitive code.

All maps:
Enter GiveMeTheMaps as a case-sensitive code.