DOOM 1 - LOSTLEVL.WAD (dmlost.zip)
Channel: DOOM WAD World
Date: 2023-02-22

called "DMLOST.WAD" in the /idgames FTP.
https://www.doomworld.com/idgames/levels/doom/d-f/dmlost
created by Tim J. Ash (TIMinator) on May 15th, 1994.
from the .txt file included with the WAD:
"This is the Lost Level of DOOM, the one your mother never told you about! A big, complex WAD, almost 200K, this one is not for novices."

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