Prior to Rohrer’s talk, a few hundred envelopes were placed on the seats in the room. Printed on the envelope: “Please do not open yet.” After Rohrer described his game, he asked attendees to open their envelopes. Inside each one is a piece of paper with 900 sets of GPS coordinates. In total, Rohrer gave the audience more than 1 million unique GPS coordinates. He estimates that if one person visits a GPS location each day with a metal detector, the game will be unearthed sometime within the next million days — a little over 2,700 years.