Fifteen clues. Two hours. One city. This is ScavengerHunt.com, a self-led scavenger race that sends groups capering around town to solve riddles and challenges. But unlike other city-wide excursions, ScavengerHunt.com 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 set afoot whenever they've got two hours to spare. Guided by clues sent to their smartphone, they'll discover hidden gems while getting fun stories and insights about historical sites they encounter. They'll also rack up points along the way, competing against other teams around the world for ultimate glory on ScavengerHunt.com's virtual leaderboard.