Slenderman Horror Story MadHouse is a great horror action-adventure game where you try to get away from Slenderman while enjoying the game's great graphics.
You have to beat a creepypasta in order to finish the game. You are a prisoner who needs to leave! You went crazy after getting away from Slenderman in your own house. You've reached the asylum, so you can now take it easy. The goal of your group is to get rid of the zombie threat, but some people may have other plans.
Have fun and good luck!