The author is the authority scene (screen) creation and the board library in Crown SDK (which is allowed to make 2D games for Windows, Macintosh, cell phones, and Apple television). This book gives a simple method for making progress between individual scenes, for example, going from a principal menu scene to one where the player picks a level, and so on. This instructional exercise isn't so much for complete novices to Crown SDK - - it expects you've messed with it a bit. Probably late-fledgling to early-transitional level.