Agario is a simple yet highly addictive online game where players control a small cell in an open world and try to eat smaller cells to grow larger. The bigger you get, the stronger you become—but also slower and more vulnerable to other players. Agario requires skill, patience, and quick reflexes to survive and dominate the leaderboard. With its easy-to-learn mechanics and browser-based gameplay, Agario has become one of the most popular and beloved .io games worldwide.