Fat Brain Toys Ivan's Hinge Folding, looping, bending, twisting, turning brainteaser you won't be able to put down; fun and brilliance converge into one thrilling experience! Pick out one of the 56 challenge cards, study the image, and then start folding and aligning the hinges to try and recreate it; each challenge is more difficult than the last Brain-busting fun for all ages 8 and up; high quality construction and materials for lasting durability, exceptional puzzle-solving experience; fully safety tested Invites curiosity, logic, determination; strengthens visual-spatial skills, fine motor manipulation skills, planning, creative thinking, critical thinking Winner of Parents' Choice Recommended Award, Major Fun Award for Puzzles; invented by the famed puzzle creator Ivan Moscovich; includes 1 Ivan's Hinge puzzle, 56 challenge cards Invites curiosity, logic, determination Refines visual-spatial skills Ideal for brain stimulation and relaxation Inspires Critical and Creative Thinking Appeals to a wide range of ages Unique hinge design  A great fidget toy Great for Traveling By famed puzzle creator Ivan Moscovich High quality materials  Lasting durability