This page contains Doom 3 Hints for PC - Windows called "Nightmare Difficulty Without Finishing the Game" and has been posted or updated on Jan 20, 2009 by dovettex. Let us know what you think of this Hint by thumbs voting.
Nightmare Difficulty Without Finishing the Game
You will need to edit the DoomConfig.cfg file, located in the /Data/BASE folder. Make sure you backup the file before making any changes. Open the file with Notepad or other text editor. Look for the "g_nightmare" entry. If you haven't finished the game yet, you will see the number 0. Change it to 1, save, and nightmare mode will be unlocked.
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