In Mastering the SpriteKit Framework Peter explains step by step and in great detail how to build professional iOS 2D games that make use of SpriteKit framework using modern Objective C programming principles. If you are an iOS developer with some experience and want to improve and extend your skills to be able to develop 2D iOS games, or if you are a less experienced cocos2D developer and want to learn how to use the SpriteKit framework as a replacement for cocos2D, this book is certainly worth adding to your library, and reading it will save you precious time.