holoholo app for iPhone and iPad

Holoholo is a location-based, scavenger hunt-style game… but with a storyline. With the use of a fictional story layered on top of the physical world, holoholo allows you to experience a compelling narrative in real-time and on location.
Interact with characters and physically follow a storyline by checking in to various locations throughout a city. At each location, you will solve riddles or complete challenges related to the plot to unlock subsequent chapters of the story. All the while, you will discover new places or revisit familiar places with a different perspective.
The first story, The Meninas Jewel, is set in Madrid. King Felipe IV of Spain has learned of a plot to steal a priceless family jewel. You, along with one of his bravest knights, have been enlisted to help to prevent this crime. Do you have the stamina and quick wit to stop the thieves before its too late?