Your littles will enjoy this set of 12 STEM building challenges! The STEM challenges are meant to be as opened-ended as possible, making use of basic interlocking block pieces of any size or brand, while inspiring creativity! Each challenge has one full- color poster, complete with an example and a real-life picture. The posters were designed to hang, one or two at a time, in the block center. Alternatively, they can be laminated and made into a book. Posters with 4 builds each are also included