Diep.io

Diep.io is a browser-based multiplayer shooter where you control a tank in a top-down arena. Your goal: destroy other players and obstacles to level up and upgrade your tank's stats. As you progress, you unlock different tank classes with unique weapon configurations—spread shots, snipers, twin cannons, and more specialized builds. The arena constantly spawns geometric shapes that grant XP when destroyed, but other players are hunting the same targets. You'll balance farming for upgrades against engaging in combat. Death means starting over from scratch. Sessions are quick and the upgrade tree branches enough that each run feels distinct depending on which specialization you pick.