My first Doom WAD took 12+ hours to make. :D
It's a horror map with custom monsters (with their custom sounds!) and music I composed myself, too. It's fairly difficult even for me. Dark Souls is one of my favorite games and this map does contain some of that trial and error gameplay, unless you're really good at PacMan.
Your mission in this map is to find all the required keys to enter the exit area. But how alone are you in these tunnels exactly--?
Most likely requires GZDoom to work. At least that's how it was tested. Used Doom 2 IWAD and the map is in the Ultimate Doom Builder format.
https://doomshack.org/uploads/EscapeTheHellTunnel.wad