DOOM 1 - WYB_E2M1.WAD (dmwyba.zip)
Channel: DOOM WAD World
Date: 2023-03-29

called "Watch Yer Back!" in the /idgames FTP.
https://www.doomworld.com/idgames/levels/doom/d-f/dmwyba
created by Tom Boyles on June 28th, 1994.
from the .txt file included with the WAD:
"Completely new level from scratch. The builder of this level loves those little tricks that can be done in DOOM, So... Watch Yer Back!"

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