Scary Blocks is a Puzzle and Parkour map for Singleplayer. Some Horror elements are included, and a lot of custom map mechanics as well! It will probably take you about one hour to get through the whole map.
Important: This map uses a resource pack which is already included in the world download and will load automatically when you open the map. If you should experience problems though, and the resource pack doesn't load, you need to play in exactly the version 1.8.7! If you already did that though, and the resource pack still won't load, I've provided an additional download link for only the resource pack. You only need to put that in your resource pack folder and then select it in Minecraft. You can find the resource pack here.