The game places players in a petri dish as a microscopic cell. The primary objective is simple: consume smaller mass (randomly generated pellets or other players) to grow larger while avoiding consumption by those bigger than you. Essential Controls and Mechanics Agar.io: The Game's in the Name - Cameron Lindsey, 2019
| Mechanic | Effect | | :--- | :--- | | | Touch a smaller cell to absorb it. | | Viruses (Green Spiky Cells) | Hitting one with a cell larger than the virus causes the cell to shatter into many small pieces. Can be used defensively or offensively. | | Ejected Mass | Shrinks you slightly. Feeds pellets to others or creates obstacles. | | Teaming | Two or more players coordinate, using the "W" key to feed each other to create a giant cell that can split-kill others. | agariocom