Use your brain power to build! Create 3D structures from 2D patterns! The challenge cards show different angles of a design to recreate, from beginner to expert. Build your brain power as you form the structures! Strengthens STEM, fine-motor skills and strategy A new and exciting way to experience KEVA planks Perfect for on-the-go learning and for curious children Includes 20 durable planks, 30 double-sided cards in a zippered carrying case