Okay, Mayhem Mansions is... a fucking weird Doom mod. It's actually a remake of a much earlier FPS/puzzle/horror/adventure game? called... uh... and I wish I was kidding "exploding lips".
I'm playing this becuase I had a look at the original and yowsza that is clunky as heck, but the doom mod version is surprisingly playable. It is however...
...
an absolute bloody fever dream holy shit. I named my save file "what the unholy fuck" as a result.