Wherigo is a toolset for creating and playing GPS-enabled adventures in the real world. By integrating a Wherigo experience, called a cartridge, with finding a geocache, the geocaching hunt can be an even richer experience. Among other uses, Wherigo allows geocachers to interact with physical and virtual elements such as objects or characters while still finding a physical geocache container. A Wherigo-enabled GPS device is required to play a cartridge. Learn more at Wherigo.com.
In essence, you download a game cartridge into your smartphone or Wherigo-enabled Garmin and follow the instructions. Some will lead you spot to spot (called ‘zones’) – once you reach the zone you will be given directions to find the next one. Some will ask you questions at each zone before you can move to the next location. At the end, you are given coordinates to find the final cache container.