Can you move the six bottles in such a way that it's possible to remove the tray beneath? It's harder than it looks. From legendary (and diabolical) puzzle designer Jean-Claude Constantin, this bottleneck of a puzzle (sorry) tests your spatial reasoning, logic, and strategy skills. MDF, metal, and Lucite. Arrives in a black wood crate. 8"w x 4"h. Ages 14 and up.