Brutal.io lives up to its name as players pulverize each other with giant spinning balls of death. Starting out with a small morningstar-like ball attached to your player, you'll sprint around the map to gather up food, slowly growing the size of your death all, which you can then fling at other players, using a combination of spin, planning, and more than a little dumb luck. 

If the throw doesn't get them, then the return just might, as holding down your mouse button summons the deathball back to the player's tail, flattening everything in its path.