Just for clarification, this is a mod for Doom. It requires the original doom.wad (specifically Ultimate Doom version 1.9) to run, and some engine to play it in. Either the original doom engine or a modern source port (chocolate doom, prboom+, gzdoom, or some such).
http://manbitesshark.com/
https://www.rockpapershotgun.com/201...ly-1996-style/
http://manbitesshark.com/
https://www.rockpapershotgun.com/201...ly-1996-style/