In Paper.IO you will have to compete with other players in a circular arena to try to conquer as much land as possible. You will take on the role of a square character that you can control with your computer mouse. This character will leave a trail that will mark the limits of the new territory that you are going to conquer. When you draw a shape with this trail and close it, you will add this new fragment to your territory. Be careful, you will come across other players eager to expand their own territory. In order to get rid of them you will have to try to cut their trails when they are trying to conquer more land. Try to survive the attacks of the opposing players and conquer as much land as you can and you will reach the top of the server ranking.