I just downloaded a Half Life mod called "Afraid of Monsters."
If you wanna shit yourself, that's the game to do it with.
The level design's a little shitty, though, so make sure you're ok with wandering around dark hallways for extended periods and seeing the message "HMM, THE LOCK SEEMS TO BE JAMMED. IT'S NOT GOING TO OPEN" repeated to infinity.
Hybrid Mode
