Reddit page: 

https://www.reddit.com/r/snapmap/comments/4ot3yn/fall_of_the_demon_slayer/

A custom map for DOOM 2016. This is not a typical run 'n' gun adventure as players have to stay alive in poor conditions like not having sufficient ammunition or any tough survival skills in a terrifying environment.

The process is linear. Levels are story-driven and with horror scenes as well as heavily scripted events. Difficulty and pace are tweaked numerous times, giving players a distinct experience from the original game.