Big music box assembly game. Intended for use only in closed places with public supervision and operation, such as science museums and children’s museums, and not for outdoor parks. Rubber parts and bolts around the big wheel can be disassembled and adjusted according to well-known musical pieces by changing the positions of the pins in each section. As part of a joint activity day, the users can reassemble the sequence of keys and play a familiar piece, or one they composed themselves, on the big wheel. Stainless steel with rubber and concrete parts. A mechanical musical instrument.