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."
Citizen 'Eco-Be' Miniature Soccer Robot
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