Slender.Io is a 2D shooter game which is based on Slenderman, a popular horror title. Play solo or work together with other humans if you are chosen to be an ordinary person. Your mission after you start off with a man is to collect enough 8 missing pages which are regarded as important clues to discover a savage experiment conducted in the past. It is related to a soldier and he was turned into a monster. When you gather those notes, you can open the shop of Slender.Io to buy better weapons which will increase the chance to survive and win. Meanwhile, the scary creature will chase and kill you to block you from completing your task. You’d better evade them when you have already stepped into the playfield or you can deploy tools to eliminate them before they attack. Try your best to fulfill the challenge as soon as possible!