A 200 ml bottle with a wooden ball inside, the main hardwood shaft has a bolt and a split pin through it preventing it from coming out. The objective is to remove the wooden ball. Eventually you WILL succeed but the real challenge is to replace everything to original status. If you really are having problems solving this puzzle then please visit this site below on Facebook, copy and paste this link into your search bar. https://www.youtube.com/watch?v=VWKt4AOM5Yw Materials: Beech wood shaft, wooden ball, split pin, nut bolt and 200 ml empty bottle.