*Difficulty-Moderate to Difficult Quite tricky to open. This Limited Edition Puzzle Box was given to select Karakuri members as a 2011 Christmas gift. Comes with opening instructions and gift box! Measures approximately* 4.75 x 3.5 x 2.3 inches Constructed with Walnut, Camphor Tree, Magnolia and Agaths woods. High quality urethane finish. Stamped with Oka-san's hanko.