Puzzle pieces as the name of the letter 'H' as two intertwined. Want to move a similar piece is tricky because tangle-free storage. Design of a puzzle writer Oskar Van Deventer in the Netherlands.　 "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: 162 g