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This looks like a good candidate for the Crazy Hacks wiki: GPS::Tron is a real-life remake of the classical TRON game using modern technologies like GPS, Bluetooth and GSM or GPRS. Two players run around in the real world (carrying a GPS device) and "draw" trails. They can see their own trail as well as that of their respective opponent on their cell phones. The first player who hits his own trail or that of his opponent loses.
