You will get the source code for a live app: [What Number](https://itunes.apple.com/app/what-number/id504132050?mt=8 "What Number")
For $99 you will get the source code for commercial use, which means that you can re-submit it to the app store. The images and design are included in the source code to help you with the sizes of the images etc, but you need to replace them with your own images.
This a an app with an algorithm for guessing a number. The user thinks of a number. After the app will display "cards" with a lot of numbers and you should say if your number is on the card of not. According to your answers (if they're correct) the app will find the number you were thinking of.
Please read the Documentation that comes with the download of the source code.