Diep.io is a multiplayer online game where players control tanks and try to destroy other players and obstacles in the game arena. Players can upgrade their tanks by earning experience points and leveling up.   To play Diep.io, follow these steps:   Go to the Diep.io website (diep.io) or download the Diep.io app on your device. Choose a username and select a game mode (Free For All or Team Deathmatch). Use the arrow keys or WASD keys to move your tank and the mouse to aim and shoot. Destroy obstacles such as polygons and triangles to earn experience points and level up. Collect power-ups such as health and speed boosts to increase your tank's abilities. Destroy other tanks to earn even more experience points and level up faster. Choose which stats to upgrade when you level up, such as bullet speed or tank health. In Team mode, work with your teammates to eliminate the opposing team and dominate the arena. The game features various types of tanks, each with its own unique characteristics and abilities. Players can customize their tanks by upgrading their stats and choosing from a variety of weapons and equipment. Diep.io requires both strategic thinking and quick reflexes to succeed, making it a fun and challenging game to play.