It shouldn't take much longer than five hours to play through the 15 levels in The UnderGarden, but it's worth going back for more. There are hidden gems and special flowers in each world, and you get a bonus for collecting every musician and causing every flower to bloom. But the real reason to replay levels is the engrossing atmosphere. The gorgeous visual design and enthralling score create a peaceful feeling that's difficult to pull away from even after you've seen everything this game has to offer. You can also play through the whole adventure cooperatively, and though it doesn't change the gameplay, it's fun to experience these worlds with someone else. It's a shame the controls can't match the joy exuded by the other elements, and the camera too often has a mind of its own, but these are small problems in a game overflowing with simple pleasures.