This book provides an overview of the design and development of learning games using examples from those created by the authors over last decade. It provides lessons learned about processes, successful approaches, and pitfalls that befall developers of learning games and educational transmedia experiences. The book includes stories from the authors' lives that give context to why and how they built these products to help the reader understand whether or not building a learning game is right for them and what challenges they might face. It also gives a framework for thinking ethically about design and research when it comes to designing complex digital systems like educational games.