Akiyama Durable Moving Boxes - Heavy Duty Packing Boxes for Shipping, Storage & Moving - Perfect for Home, Office & Warehouse Organization

The eight pieces of this puzzle are painstakingly handcrafted from a rich variety of woods.  Designer Vaclav Obsivac rates the difficulty of putting them back into their wooden box once you've taken them out as 5+out of 5!  The pieces can also be used to solve several other equally fiendish shape challenges, along with some easier ones.