Options needed: Infinite health, armor and ammo.
here**Deleted**I also recommend downloading brutal doom
& gzdoom that gives all doom classic related games for easy modding for brutal doom aspects
also you can play the game using gzdoom if you have final doom or ohters on steam and give more options for custom play, basically theres no need for you to run it on steam
[Edited by moderator KingEli, 1/24/2019 6:37:09 AM]
Please don't mention any other cheat sites in your future posts, and the built in cheats wont help OP because they don't work on nightmare difficulty.
About Brutal doom I agree, a great mod, here is vid I captured demonstrating all the guns and gore:
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem