https://slayersclub.bethesda.net/en-US/article/new-add-on-sigil-ii-doom
John Romero and everyone else from hell is celebrating 30th anniversary of DOOM with a brand new DLC! This coincidence with the current Linux Kernel 6.6.6 we have at the moment and why I started playing DOOM at NIGHTMARE difficulty (I do not recommend it, can’t even make through map 1). I am currently trying out all the different DOOM versions and implementations I have on my system.
Had no chance to try out the new game SIGIL II yet, so any reports welcome.
You can download the .wad file from the creators webpage: https://romero.com/sigil ( exact download link: https://romero.com/s/SIGIL_II_V1_0.zip ) . It’s a free download, but contains only the original Midi music. The version with MP3 soundtrack can be purchased if you want support it. This .wad file still requires the original doom.wad, as it is just a mod. Depending on the configuration you have, you might just need to drop the doom.wad in the same folder as SIGIL_II_V1_0.wad and play it with the PrBoom core: https://docs.libretro.com/library/prboom/ .
Finally a screenshot running it in RetroArch. I tried to kill that guy by punching it, but almost died and then used my gun.