The intellectual toy is an ancient and traditional intellectual game in China. It has a long history and is enduring. It has very complicated mathematical principles and physical principles. It is difficult to fight back even if it is opened in a short time. The small shape has greatly tested people. IQ. Designed to test your brain, patience and coordination. Conducive to creative thinking, improve your IQ and emotional intelligence, especially those who like to be challenged. Recommended for use over 6 years of age.