Agar.io (sometimes referred to as Agario, adapted from URL) is a massively multiplayer action browser game played from a top-down perspective, developed by Reddit user Zeach.[1] In Agar.io, the player controls a cell using the mouse and keyboard buttons. The goal of the game is to enlarge the cell by absorbing "pellets" which spawn randomly around the map, as well as by consuming other players.[2] Originally a browser game, Agar.io entered Steam Greenlight and was subsequently "Greenlit" by the community, with the developers indicating that they planned to add more features not available in the web version of the game.[3]. GET FREE GAMES.