Design and puzzle does not seem at first glance. Fun, like playing music. Design puzzle writer Dmitry Pevnitskiy of Russia and Kirill Grebnev. 2010 Puzzler's Award winning "world puzzle design competition".　 "The cause" and is? "Has caused" and the adult inspiration and logic to solve the puzzle. The Mission's "off." And "back to you". Simple, but profound. And take full advantage of the head and hands, I try to challenge you. Product specifications: ages: 6-year-old-difficulty: 2 (out of 6) size: 75 × 119 × 45 (mm) weight: 85 g