Nintendo have opened a Japanese website for Kirby: Mass Attack, showing off how you move and direct your Kirby army. You can also have Kirby swarm an enemy in a mass attack and devour him mercilessly:
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While you can control a ten-Kirby-army at a time, some puzzles will require that you only use a certain number of Kirbies. Kirby: Mass Attack will hit the U.S. on September 19th.