Jul 31, 2012 - The GreenHound App is about Poo Power. It is a game with a dog track on which players race the dog of their choice. But before players can race they have to collect enough poo from the trackside the power the stadium. If they don't, the lights go out before they reach the finish line. If a dog wins its race, players get points that they can use to unlock questions (and answers) that will show just how unusual, and effective, poo can be as a source of renewable fuel.