Invincibility:
Enter DEATHWISH as a password.

Unlimited ammunition:
Enter BIGPOCKET as a password.

All weapons:
Enter TOOLEDUP as a password.

One shot kills:
Enter OOHSTOPIT as a password.

Rapid fire for shotgun:
Enter MYBIGUN as a password.

Extra explosion damage:
Enter ACMEBANGS as a password.

Enemies do not move:
Enter COLDFEET as a password.

Invisible mode:
Enter DOYOUCME as a password.

Alternate sounds when hit or killed:
Enter HORNBLOW as a password.