Good video games incorporate good learning principles, principles supported by current research in cognitive science (Gee 2003, 2004). Why? If no one could learn these games, no one would buy them, and yet players will not accept easy, dumbed-down, or short games. At a deeper level, however, challenge and learning are a large part of what makes good video games motivating and entertaining. Humans actually enjoy learning, though sometimes in school you would not know it.