Race & Seek, Atlanta

During Race & Seek, an extra phone battery in your pocket could easily be worth thousands of dollars. The urban scavenger hunt sends teams of 2–10 out into city streets in search of 14 clues, which they must capture via photo or video with their smart phones. The first-prize winners haul in some serious bounty: $500 and free entry into the Grand Championship, where $5,000 waits at the finish line.

But a slew of physical and mental challenges stand in the way of that money. Harder and harder clues come in via text and email, and as participants decipher them, they must navigate the city largely on foot—no cars, bikes, taxis, or griffins are allowed—with the aid of GPS and a city map.