What is slender the 8 pages?

Slender the 8 pages is a Horror game. It has really bad graphics but is scary. In the game you are given a flashlight(at night ) and your in the woods. The point of the game is to find 8 notes without being killed by Slender.Slender is a fictional character but has said to be witnessed in Germany. He is 8ft , has tentacle like arms, and no face.