This is a puzzle about the progress of the plot. The specific location is in the doll house. Players need to find the winding key and let you put the gas cylinders in the correct order on the music box to unlock it.

　　At first, you have to find the left leg of the toy in the doll's room. If you find the winding key in it, you can manipulate the keys on the music box.

　　Then put the cylinders in the correct order, which is actually not difficult, because each cylinder has corresponding scratches.

　　According to the default order, from left to right, the order is:

　　Put gas cylinder 2 in slot 1, gas cylinder 4 in slot 2, gas cylinder 3 in slot 5 and gas cylinder 4 in slot 3.

　　After putting these gas cylinders in place, you can play music normally, and then a tweezer will appear. Use tweezers to take out the film and put it in the study.