DOOM 1 - graydoom.zip (BADWATER.WAD, GAUNTLET.WAD, IMPSKULL.WAD, & SWAMP.WAD)
Channel: DOOM WAD World
Date: 2023-06-30

called "GrayDOOM" in the /idgames FTP.
https://www.doomworld.com/idgames/levels/doom/g-i/graydoom
created by Richard Gray (a.k.a. Levelord, a.k.a. GrayMatter Software Solutions) on July 3rd, 1994.
from the .txt file included with the WAD:
"The Graytest DOOM missions EVER! Try them, there are NONE LIKE THEM ANYWHERE! Even the WIZARDS OF id themselves will be amazed!

[Please check out the text file GRAYDOOM.MAN, that comes within the zip, for a detailed description of all the levels.]"

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discord: https://discord.gg/aUsWnqaePy