We recently learned of a cool new interactive mobile app designed to initiate the discovery of public spaces and their hidden potential for meaningful and fun exchanges between people and their cities. Revel turns sets of instructions, called challenges, into adventures and experiences that can be shared by friends or strangers. You can write your own challenges in any of Revel’s seven categories: Appreciation, Exploring, Fitness Traning, Games, Neighbors & Networks, Photography, and Storytelling. Players are simply encouraged to be creative with their interpretations of these fields! One main ground rule for the game: challenges have to take place in public space, such as a city street, sidewalk, or park.