Killer.io is a fun online game where we have to destroy completely real players who come across with a killer. There is a killer in the game. We can control this killer. With the killer we can control, we are trying to destroy completely real players that appear in a limited area. We get points by destroying players. We are trying to enter the ranking with the points we have achieved. We also earn money by ranking. We can continue the game by purchasing different costumes for the killer that we can control with the money we earn. Killer.io has emerged as an online game that is thoughtfully prepared for us adventure game lovers, as well as challenging us.