This is a step-by-step, hands-on guide that is filled with examples and screenshots of building a multiplayer virtual world. The virtual world is built gradually; each chapter in the book sequentially develops the virtual world. The author explains the fundamentals with examples from existing virtual worlds such as Club Penguin, Mole, Dofus, and World of Warcraft. If you are a Flash or an ActionScript developer who wants to build powerful and immersive multiplayer games, this book is for you. This book assumes that you have some experience with ActionScript 3.0.