Ball puzzles to create more possibilities. Now, ready to play the puzzle. You can play with balls, and you can also be used as a gift decoration.
The assembling process can train a robust logical thinking ability and recover the lost concentration.
Mechanical gear drive
Rotate through gears, and realize the whole moving process.
Converting light energy into electrical energy is green and environmentally friendly, and there is a battery-powered box that can rotate in a sunless place.