DOOM 1 - DMPITS.WAD
Channel: DOOM WAD World
Date: 2023-03-03

called "dmpits.zip" in the /idgames FTP.
https://www.doomworld.com/idgames/levels/doom/d-f/dmpits
created by NICHOLAS BELL on either April 4th (file date, but would make it an incredibly early WAD) or July 29th, 1994 (according to doomworld).
from the .txt file included with the WAD:
"THIS MODIFIED LEVEL IS THE RESULT OF 35+ HOURS OF EDITING AND TESTING. I HAVE DONE MY BEST TO MAKE THIS LEVEL TOUGH YET "DOABLE." I SURE HOPE YOU GIVE IT A FEW TRYS WITHOUT USING THE CHEAT KEYS. SAVING FREQUENTLY IS NOT A BAD IDEA UNTIL YOU FIGURE OUT THE "TRICKS" OF THE FACILITY, BUT USING "GOD MODE" WILL REALLY TAKE THE FUN OF THE MODIFICATIONS. I'M SURE MOST OF YOU WON'T HAVE ANY PROBLEMS AT ALL.

I DESIGNED THIS LEVEL WITH A VERY SPECIFIC MOVEMENT AND WEAPON SELECTION STRATEGY. IF YOU FIND YOURSELF SAYING "THERE'S NO WAY ANYONE COULD BE FAST ENOUGH TO SURVIVE THIS," THEN STEP BACK AND REEVALUATE YOUR APPROACH. DON'T GIVE INTO THOSE CHEAT KEYS. ONCE YOU DISCOVER THE METHOD TO MY MADNESS YOU'LL ONLY HAVE TO DEAL WITH THE RANDOM VARIABLES AND LOSING YOUR GRIP ON THE MOUSE OR JOYSTICK G. OF COURSE THERE ARE MANY AREAS WHERE YOU HAVE A WIDE SELECTION OF TACTICAL CHOICES, AND WHAT YOU DECIDE HERE WILL DETERMINE WHETHER WALK OR CRAWL TO THE EXIT DOOR, OR END UP WITH CRITTERS DOING A JIG AROUND YOUR CORPSE.
ON AVERAGE, IT TAKES ME 35 MINUTES TO COMPLETE THIS LEVEL. AND DESPITE MY KNOWING EVERYTHING ABOUT THIS LEVEL, I STILL GET UP FROM MY COMPUTER SHAKING. I HOPE YOU HAVE AS MUCH FUN!"

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discord: https://discord.gg/aUsWnqaePy