n2k Map is a geocaching game in which you the user can create maps that you can send to their friends and colleagues. It uses the cloud to store images and web references that they can give users clues to finding objects and answers. It includes a simple question & challenge option at each find to confirm finds. You can also link webpages to locations as alternative giving you the ability to dynamically change finds and clues should you so choose too. It is rated at 17+ because you can reference any web page using said option.