Go to at the main screen. Here you can choose your nickname and the mode of gameplay, and then start playing by pressing ↵ Enter on your keyboard. Here you can also see your achievements by moving the cursor to the right side of the screen. There are different modes of gameplay in diep.io. You can choose between: FFA, which involves "free for all" gameplay, where anyone can kill anyone. Survival, which is basically a 'battle royale' in which 10 tanks play against each other on a map that is slowly shrinking. Also, during Survival, every point you earn is worth 3 points, so if you get 10 points, you get 30 points, if you get 25 points, you get 75 points. If you get 100 points, you get 300 points. 2 and 4 Team (TDM) options, which is played with teams. When you play teams, there is a base, and if anyone from the opposing team(s) get to close, little triangles will attack them until they are too far away. Also, anything from the opposing team that touches the base will instantly disappear. Domination, which is teams played with four giant tanks (called Dominators) in the middle. Whichever team
Begin the game. When you start, you will spawn somewhere as a level one tank. Move by using the arrow keys or WASD. In the middle is your tank, which you control. Below it is a green bar that shows how much health you have left (it only shows if you are damaged). In the upper righthand corner is the leaderboard. It shows the 10 tanks with the highest scores. In the lower righthand corner is the map, which will show where you and team bases are in the game. In the center in the lower part of the screen is your tank info. It says your nickname, score, level, and type of tank in use. In the lower left-hand corner is the tank stats, which will be explained further down. In the upper left-hand corner is the upgrades, and they will not show up until you reach level 15, 30 or 45, which will be explained alongside tank stats.