Killer.io - kill and hide bodies in this unusual online killing game. Try to kill as many people as possible at the Halloween party. Try not to get caught! While people are having fun in the house where the party is taking place, you are considering a cunning plan, as a result of which you may well become a serial maniac. Other players are also waiting for a good moment. Therefore, do not yawn and begin to carry out your gloomy actions.