Citizen has released cool little robots that actually battle it out to play soccer. The original source is in Japanese, so I think that answers your next question: "Can I get one?"
New Launches described the fighting robots by teaching us, "The new model Eco-Be robot is further miniaturized when compared with previous models. The new robot is infrared compatible, advanced operations are carried out with great accuracy like left and right turn etc."
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Citizen 'Eco-Be' Miniature Soccer Robot
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