Killer.io

Killer.io is a great online game that is inspired by a popular game called Party Hard. You find yourself at a wild Halloween party and your objective will be to kill as many people as you can. You need to do it so that no one notices. You can then toss the body outside in a body bag. If someone sees you, they will call the police and they will take you away. You can later try to join the party again, but you lose time in the meantime which can then be used by your opponents. The coins you earn can then be used in the menu to buy a new costume for your character, so that you end up higher in the score board.