Fifteen clues. Two hours. One city. This is Big City Hunt, a self-led scavenger race that sends groups capering around town to solve clues. But unlike other city-wide excursions, Big City Hunt unshackles racers from the tyranny of official start times and concrete dates. Players simply click on a launch code, head to the starting line, and get on with it whenever they've got a spare two hours.
Partial Data by Foursquare.