Test logic and creative minds with this cool yet simple brain teaser. These brain games are perfect for passing time fidgeting and avoiding gadgets and electronics. They’re a healthier way to practice focus and concentration. Can also be used for fun party games.・Wooden 3D brain teaser puzzle toy originated from ancient China which called Kong Ming Lock. Wooden game with interesting logical thinking and perfect for development of brain.・Metal coils are smooth and has NO SHARP EDGES for end