PLEASE NOTE THAT INSTRUCTIONS ARE WRITTEN IN JAPANESE ONLY! Includes illustrations. This build-it-yourself wooden puzzle box solves by using centrifugal force, hence the name SPIN BOX. When you are assembling this work kit, you will really be able to understand the mechanism well. This creative and fun wooden project is made from plywood. You can paint or draw something you like on the box when it is assembled. Comes with illustrated step-by step instructions that are written in Japanese only!! Wood glue is required for assembly, but is not provided in the kit itself.The difficulty of building the puzzle is harder than the actual puzzle itself. CARE AND UPKEEP OF JAPANESE WOODEN PUZZLE BOXES.