The Padlock design looks similar in size and weight to a lock one might find at the gym, but look out - there's no key or combination of numbers to solve this one! Just pick it up and you'll quickly gain an appreciation for the challenge that lies ahead - this puzzle will not open easily! The interior is comprised of two elliptical pieces, locked together tightly around the circular pieces and obstinately refusing to be released. But don't give up! This seemingly simple design may take hours to unravel - but your mission is only complete when you have put the lock back together again. The theme is "obstinacy." Designed by Korean designer JinHoo Ahn. Level 5 (out of 6) puzzles are considered difficult. Hanayama of Japan, maker of the world's finest cast puzzles, chooses from designs by master puzzle inventors for their challenging line of cast metal brainteaser puzzles. Hanayama are known for their extreme attention to detail, high finish quality, and creative, clever and innovative styles in six degrees of difficulty from easy to expert. Complete the first task of taking the puzzle pieces apart, then try to figure out how to get them back together and return the puzzle to its original state. Can you take it apart? Now try and put it back together!