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PSXDoom Hack - Nightmare(Lite) Mode
What you need is a copy of PSXDoom, ePSXe, PSX Emulation Cheater, and a hex editor (I HIGHLY recommend Hex Workshop). Load the game and hit Ctrl-J to hack the game memory in your hex editor. Then go to the address 0x000361FC and change 0x0300 to 0x0400, which will allow you to shift the skill past Ultra Violence on the main menu.
Unfortunately it’s not the TRUE nightmare skill since there’s no respawning of anything, but the monsters do have a higher attack rate.