Level selectM
Enter "FREEPLAY" as a password.

Invincibility
Enter "NODIE" as a password.

All weapons
Enter "GIMME" as a password.

Invisibility
Enter "NOSEEUM" as a password.

Mini mode
Enter "SHORTY" as a password.

Big mode
Enter "IMHUGE" as a password.

Debug information
Enter "THDOTEST" as a password.

Level passwords

Level Boot Camp Dinner Table Bridge Refrigerator Graveyard Castle Tan Base Revenge Desk Bed Plasticville Toy Shelf Cashier Toy Train Town Rocket Base Pool Table Pinball Machine

Password BOOTCAMP DINNER OVERPASS COOLER NECROPOLIS CITADEL MOUSE ESCAPE ESCRITOIRE COT BLUEBLUES BUYME EXPRESS LITTLEPEOPLE NUKEM EIGHTBALL BLACKKNIGHT