Slender
First-Person indie game based on the Slender-man mythos meme thing that I don't really know much about. What I do know is that this game's programmers know how to do horror. Basically you're just in a fenced off forest area and you have to try and recover 8 manuscripts that give you some insight into the slender-man character, as he slowly stalks you through the dark and scary woods.
Oh, and it's free!