You can customize the encouragement and rewards your child can earn for completing puzzles. The app allows for separate user accounts for each child and there is TONS of content in this "find the difference" app. It's easy to use and provides hours of entertainment.
There's a link to the app store on the home screen, and the voice sounds a bit mechanical.
This app has been also added to your wishlist, so your parents can see all the apps you want to download!