The app that first sold me on the beauty of Toca Boca apps has gone FREE for a limited time! Toca Doctor won my then-preschooler over with the fun puzzles and childhood-favorite game of playing doctor. It is fun and engaging and somehow never old to a preschooler. It's definitely one to download when it's free — if you have a preschooler or work with a preschooler, it's really a must-have app. But even if you don't currently have any reason to use it, download it anyway! It's an easy one to load on an iPad for a visiting preschooler.