To make these work, just type the desired codes while in-game, during the levels. They should also work with Final Doom and Freedoom‘s phase 2.
Remember, the original cheat codes do not work on Nightmare difficulty.
Code – Effect:
- iddqd – God Mode.
- idkfa – All weapons and ammo plus keys.
- idfa – All weapons and ammo.
- idclip – Can walk through stuff.
- idclev[Number] – Moves to level [Number]. [Number] goes from 1-32. Maps 31 and 32 are secret maps, based on Wolfeinstein 3D, and you CAN get to them from other levels, without cheating.
- idbeholdi – Invisibility.
- fhshh – Invisible until you attack the enemies.
- idbeholdl – Light Amp Goggles.
- idchoppers – Chainsaw.
- idmypos – Shows position in code.
- iddt – Entire map.
- idbeholds – Berzerk.
- idbeholda – Computer area map.
- idmus[Number] – Choose BGM. [Number] is in XX format.
- idbeholdr – Radiation Suit.
- idbeholdv – Invulnerability.
The video down below also has the cheat codes, and they are being demonstrated and stuff: