Since its release for Apple's iPhone in 2009, Angry Birds has been one of the most successful video games in history. Although Angry Birds seemed to be an overnight success, the game was actually the result of years of struggle by Rovio Entertainment, the Finnish company that created it. The company's founder, Niklas Hed, his cousin Mikael Hed, and Peter Vesterbacka have established not just a profitable video game but a cultural phenomenon. In this thrilling narrative, readers examine the challenges and triumphs of building a company while keeping the spirit of fun behind the development of new products.