You can download the example files for this book from this location:
In the example files, you will find all the files necessary for the book. In addition to the game source code, you will also find the source code for the iOS version of the final game. Since Impact’s source code cannot be distributed with this book’s examples, you will have to supply your own copy of Impact to make these examples work. Make sure you read the included ReadMe.txt file for information on what is included with the download and how to correctly set it up.