Knife.io is a game where you spawn as a circle with a knife rotating it. You can pick other knives around the map to collect more which will automatically start rotating around you and the circle body will get bigger as you get more knives. When you don't move your knives will turn sideways and will now break knives that touch it. When you move they will point out where you can attack other players. If a player's knife touches another player's body then they will die. If a player's knives break from a player who is not moving those knives will sctter around the player where they can then be picked up by a player again. Last player alive wins.