All codes for doors (including DLC) and cheats.
- Duke Nukem’s titty City, Strip Club – 4768
- Rude Awkening, Doctor Who Cloned Me (DLC) – 1503
Beat the game on any difficulty and you can activate these cheats in the ‘Extras’ menu.
- Duke 3D Freeze Ray – Freeze ray will fire bouncing ice projectiles.
- Game Speed – Adjust game speed.
- Grayscale Mode – Draw the game in grayscale.
- Head Scale – Adjust head size of enemies and NPCs.
- Infinite Ammo – Obviously…
- Instagib – Enemies die in one shot and always gib.
- Invincibility – God Mode!
- Mirror Mode – Draw the game mirrored horizontally.
Note: This will disable achievements and it’s only for single player!