Killer.io is a cool multiplayer IO game about serial murder, and you can play it online and for free on Silvergames.com. You will take on the role of a guy wearing a hockey mask, next to a house party full of innocent young people, and you also happen to bear a knife in your hand. We all know what comes next, right?
So just start killing people while noone is standing around, hide the bodies and avoid standing next to dead bodies or the police will take you down. Have fun with Killer.io!
Controls: Arrows / WASD = move, Z = attack, X = interact