agario is a popular online multiplayer game where players control a colorful cell in a Petri dish–style arena. You start small and grow by eating pellets and smaller cells, but danger is everywhere because bigger cells can swallow you at any moment.

Despite its simple controls and minimal graphics, Agar.io is highly addictive and strategic. Since its release in 2015, the game has attracted millions of players thanks to its fast-paced gameplay, competitive mechanics, and easy-to-learn but hard-to-master design.