2 years & up. Children activate their brain to solve three different levels of complex building structures. The set includes 18 different wooden shapes and a deck of 20 cards. Each card contains either a simple to build 1 star block design, 2 star more challenging design or 3 stars for the most difficult building designs. One side of the card shows the "goal" and the flip side of the card reveals the answer or the solution of how the block structure should be built. Children of all ages will engage in this engineering activity and will even come up with new designs of their own.