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Have you played the game Agar.io? According to wikipedia, Agar.io is a massively multiplayer action game created by Matheus Valadares. Players control a cell in a map representing a petri dish; the goal is to gain as much mass as possible by swallowing smaller cells without being swallowed by bigger ones.
This is a companion discussion topic for the original entry at https://toph.co/p/the-multiplayer-action-game