After completion of this Cast Keyring – Hanayama Cast Metal Puzzle by Dutch designer, Oskar, the words “Key” and “Ring” should be properly lined up with each other. This is vital. If you try to put the pieces back together again without lining up the words correctly, you will have failed, even after achieving what appears at first to be a successful matching. It should read “Key Ring” even when upside down. The wording design is courtesy of Scott Kim. The key word is “pair”. So what you get is actually two puzzles in one. The first challenge is to take it apart. Once done, the second challenge is to lock them together again. It is a great puzzle, very well made and unlikely to get broken. You can purchase this puzzle at Puzzle Master.