Wooden Puzzle Roller Coaster Ball Coaster New, unassembled. The third and subsequent photos are of one I assembled for myself (took about 40 minutes to build). Notes on assembly: ① Because it's wood, it can break if you use too much force(´・_・`) ② Sandpaper is included, but nippers and a design knife will make it easier to build. ③ Some parts are tight, so removing burrs and adjusting with sandpaper is recommended. Thank you. #EducationalToy