Introduction This Goal of This Book Gaming on the move has become very popular during recent years. With the arrival of the Nintendo Gameboy, people realized that they could take their games out and about with them, and as technology has become more sophisticated these games have grown, too. They now encompass complex game mechanics, advanced 2D and 3D graphics, and engrossing stories and game worlds that the player can literally become lost in. Alongside this phenomenon is the explosion in popularity of mobile communication devices. Nearly everyone carries a phone with them every time they leave the house. These devices have become much more than just phones, however; they provide contact management, e-mail, web browsing, satellite navigation, and entertainment. Writing games for mobile devices allows both these trends to be brought together into the same place. It is very easy for people to “pick up and play” a game on their mobile device as they always have it in their pocket—whether they are progressing through a sprawling role-playing game on a train or simply want the few minutes of casual diversion that mobile gaming can provide while waiting for an appointment.