In the world of Diep.io you control a tank and you must shoot to defend yourself against other tanks. You can modify attacks and other features, but you will need sufficient experience points and levels. Every 10 levels you get the option to change your overall tank and change the way you shoot / play. As with most other io games, there is a game leader board that displays players' scores and an icon of the type of tank they are currently using. New players can improve themselves by trying to play everyone in one battle. It is highly recommended that you stay as far away as possible, since the high-level tanks do a lot of damage to new players.