Working principle:

3 Level Puzzle parking is designed in 3 layers and multiple columns, with one empty parking space on each floor except for the top floor. All parking spaces except the bottom floor can be raised and lowered, and all parking spaces except the top floor can be moved horizontally. When a parking space needs to access a vehicle, all the  below parking pallet from the parking space to the empty parking space are horizontal movement by a distance of one parking space in the direction of the empty parking space, and a lift channel is formed under the parking space. Then the parking space can be free to go rise or down, when it drops to the ground level, the vehicle can go in or go out.