Agar.io is the one
io games game that served as the catalyst for the emergence of IO games. In it, you consume anything that is smaller than you, including other players, as you eat, grow, and then eat some more. It resembles Osmos, a game that is somewhat similar, but Agar.io is multiplayer and free. You entered a room with a large number of other players, all of whom were vying to grow, eat, and consume one another in order to become the largest blob they could. If you passed away, you had to restart. The game gained enormous popularity, and it has since given rise to hundreds of other IO games, some of which are very similar to Agar.io and others which are not, but which all share a common structure. They are all multiplayer and completely free.
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