A couple weeks ago, I went to an interesting software developer company DeepLocal, where they have "Waffle Wednesdays" for free consulting and gourmet waffles made in your favorite flavor! This seems to be a good match for trying to actually develop my math game with a handheld such as an iPhone, GPS, Google Maps, UrbanSweep (DeepLocal's way to easily create your own scavenger hunt), and Pittsburgh landmarks.
In another post, I'll show the #1 version - whole set of Pittsburgh landmarks. From these, you choose the solution to the UrbanSweep game.