This is one of my go-to apps in working with children who have very narrow interests, because I can quickly take photos or web-shots of their favorite things and turn them into puzzles. The tile magnet helps keep kids from getting too frustrated if they dont have great motor control, and the difficulty levels (both in number of pieces and clues) make it easy for them to be successful. It was especially helpful to me to be able to be able to create a folder for each student and be able to, at least temporarily, turn off the puzzles they wouldnt care about. The app has been stable for me. Wish list: Id love to see jigsaw-type pieces as an option, rather than just tile puzzles. In any event, this has been easy to use and a popular app with my special-needs students.