The plants you grow if you explore fresh and degree of difficulty. Enjoy the radical concept that. Design of molding House Akio Yamamoto of Japan. 2005 "world puzzle design competition' Grand Prize (Grand Prix) award.　 "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: 5 (out of 6) size: 75 × 119 × 45 (mm) weight: 155 g