A visually appealing and fun puzzle puzzle toy.  suitable for completing more complex scenes between the ages of 5-9. Vibrant colors and exaggerated designs are in line with children's visual preferences. Gear and worm linkage, windmills and small cars can really rotate. Food grade ABS+ultrasonic smooth polishing, without burrs. Educational value: cognition: color, shape, role cognition; Hands on: Fine motor skills, hand eye coordination; Logic: Enlightenment of gear transmission and lever principle; Creation: The same set of building blocks can be used to assemble official and self created shapes, cultivating spatial imagination.