Approach KEVA from a whole new angle with this interactive STEM tool! Brain Builders combines 20 KEVA planks with a set of 30 double-sided puzzle cards. Each stimulating card features a 2-D challenge on one side and its solution on the other. The goal is to recreate 2-D patterns into 3-D structures. Manipulate your KEVA planks to successfully duplicate the balance, proportion, composition and geometry featured on each card. Time to put your 3-D imagination to the test! NOTE: Each kit box contains 4 sets of KEVA planks.