I love this app. I love the 3D aspect, the little details, such as the animated birds and other animals, people, changing weather. It's fairly intuitive and you can decide how many puzzle pieces you want to tackle, so it's just friendly for all ages and skill levels. Have haven't bought any bundles yet as it comes will a bunch of puzzle to start off. However I can see myself going that route in the near future as the puzzles are addictive and I've already completed a number. I would highly recommend this to anyone who loves puzzles.