John Romero has finally added another expansion to Doom and its totall free:
https://www.romerogames.ie/si6il
You can run it with GZDoom in Linux
Grab a copy of GZDoom and place the SIGIL files into "/home/username/.config/gzdoom" so it can easily find it. You can then use your favourite Doom launcher or run it simply with a quick terminal command like so:
gzdoom -iwad DOOM.WAD -file SIGIL.wad
https://www.romerogames.ie/si6il
You can run it with GZDoom in Linux
Grab a copy of GZDoom and place the SIGIL files into "/home/username/.config/gzdoom" so it can easily find it. You can then use your favourite Doom launcher or run it simply with a quick terminal command like so:
gzdoom -iwad DOOM.WAD -file SIGIL.wad