I just found this mod on Mod DB, and I am stunned. The game is a source engine game, and it is called Devil's Tuning Fork. http://www.moddb.com/games/devils-tuning-fork/news/devils-tuning-fork The game has an awesome concept with a very eerie atmosphere. It isn't perfect, but it is worth playing for the atmosphere alone. Unfortunately, you cannot save, so I did not finish it, since I couldn't figure out where to go in the 3rd level. Try it out! What do you guys think of it?