Agar.io

Agar.io is a massively multiplayer online action game created by Matheus Valadares. Players control a cell in a map representing a petri dish, and the goal is to gain as much mass as possible by swallowing smaller cells without being swallowed by bigger ones. The name Agar.io comes from the substance agar, used to culture bacteria. The game was released to positive critical reception.

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