DOOM 1 - ENGINE.WAD & KILL.WAD (dmcos.zip)
Channel: DOOM WAD World
Date: 2023-01-30

called "Engine (ENGINE.WAD), Killing Zone (KILL.WAD)" in the /idgames FTP.
https://www.doomworld.com/idgames/levels/doom/d-f/dmcos
created by Cos on July 4th and July 9th, 1994.
from the .txt file included with the WAD:
"ENGINE.WAD Quite a large level with lots to kill and a few puzzles to solve. I played it a couple of times so I know it can be done. Unfortunately, there's a couple of small areas where the mirroring effect persists, and I just couldn't get rid of it! I'm not going to tell you to be careful and save the game often etc etc, cos you'll play it your own way anyhow.

KILL.WAD For single play only because I still beleive most people play with themselves???? and there isn't really 2 fair starting points, altho' you may disagree.

Quite a large level with lots to kill and a few puzzles to solve. I played it a couple of times so I know it can be done. I'm not going to tell you to be careful and save the game often etc etc, cos you'll play it your own way anyhow.

[Authors comment about both WAD's:] I had a lot of fun creating this, I hope you enjoy playing it. Cos."

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