The Lego Hidden Side Mystery Castle 70437 is a brand new factory sealed set that was released in 2020 and is now retired. This set features 1035 pieces to build the Mystery Castle from the Hidden Side theme. With a mix of animals, buildings, fantasy, and ghostly characters, this set is designed for ages 9 and up, making it a fun and engaging building experience for both kids and adults. The set includes a Ghost, David, and Skeleton character, and comes in a box packaging, making it a perfect addition to any Lego enthusiast's collection.