Agar.io brings massively multiplayer games to the petri dish

Most massively multiplayer online games take place in epic fantasy worlds or the distant future, but one of the latest sensations takes place on a much, much smaller scale. Agar.io pits thousands of players against each other in a web-based petri dish, where each gamer represents a cell. Your only real goal is to grow larger than everyone else by swallowing other cells and dodging your bigger rivals. It sounds simple, but it can get very hectic -- and it's a good abstraction of the fierce survival-of-the-fittest competition that you sometimes see on the microscopic level.

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