All codes for doors (including DLC) + cheats!
- Duke Nukem's t1tty City, Strip club door code - 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 = Infinite ammo.
- Instagib = Enemies die in 1 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.