I have a very big DOOM 1 map ready for playtesting. It is a BOOM compatible map and I tested it with PrBoom. I used the original DOOM 1 IWAD doom.wad. The map is called 5spiders and is a single level on E1M1. Playing time is between three  and four hours. It is intended for advanced players that know their way around an old-style map. The complete TXT file with all additional information is with the wad in the zipped attachment. If you would like to give it a try and send me feedback, here it is:  5spiders.zip Make sure you use the latest build which you can download zipped from the link just above. Last uploaded version of 5spiders is build 1095 (5spiders1095.wad), uploaded November 11, 2019.     See more than 100 additional screenshots from 5spiders.wad at https://imgur.com/a/ODPibtR