Easy to assemble: The Miebely Roller Coaster Wooden 3D Puzzle Craft Kit comes with a detailed English instruction manual, and we mark the serial number of each puzzle piece clearly on the instruction manual. You can complete the assembly quickly and smoothly. We strive to make you enjoy embly process. If you encounter any problems during the assembly process, please feel free to contact us. Unique Design and Decoration: 3D Wood Puzzle is a great design for home decor and a challenge for those who like making models. Our entire model adopts a tenon-and-mortise structure without using any glue and tools. When you put the model on the bookshelf, its exquisite appearance will surely amaze your friends. Unbelievable Gift: Create unforgettable and memorable collaborative moments with your kids and family while putting this high-quality handcrafted 3D puzzle model set together. The entire assembly process takes about 6 hours, it allows your child to develop his or her concentration. It is ideal for gifting to wood-loving friends and family.