"Fun is just another word for learning." This sentence does not stem from some lofty education pamphlet or e-learning supplier brochure with the inescapable stock image of a group of Millennials smiling and excitedly pointing at some nondescript laptop. It is the conclusion that game design doyen Raph Koster arrives at after pondering the question, "Why are games fun?" in his book A Theory of Fun for Game Design.