DOOM 1 - UPDOWN.WAD (dmupdn.zip)
Channel: DOOM WAD World
Date: 2023-03-23

called "Up and Down" in the /idgames FTP.
https://www.doomworld.com/idgames/levels/doom/d-f/dmupdn
created by Jim Flynn on August 27th, 1994.
from the .txt file included with the WAD:
"Short but moderately tough...."

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