|Hanayama Cast Nutcase|
It comes well packaged in the usual Hanayama black box - It is a rather nice galvanised bolt with two nuts on it. So why is it called a nut case? Because if you shake it you can hear it rattle and when you look for the source of the noise you can see that there is a cavity in this puzzle containing a small nut! The puzzle is 5cm tall and 3.4cm in diameter - it looks and feels really quite substantial. It has been reviewed before by my fellow puzzle bloggers - Neil, Brian and Jerry.
Puzzle Master have rated it as 10 out of 10 (Mind Boggling) in difficulty and this matches Hanayama's own rating of 6 out of 6. I have to say that I think the comprehension of this puzzle is much easier than that (maybe 8 out of 10) but the execution is considerably tougher. The fact that the other reviewers have stated that they completed this one in an hour or less does mean that this is not as tough as some of the other top level puzzles which may have taken many hours to solve. As with all the Hanayama puzzles - no solution is provided. If you find you want one then it can be downloaded from Puzzle Master here.
The initial challenge with this one is to open the case and release the small nut from the case and then put it back together again. After only about 4 or 5 minutes of fiddling with this one it became quite clear to me what the mechanism had to be. Unfortunately actually carrying out the procedure that I knew had to be the solution was really considerably tougher - I think it took me about 45 minutes to open it. Because of this it feels like quite an achievement when you do manage it. I am not a lock picker but I can imagine that the technique used to solve this is rather similar - you know how it works, but it requires a lot of trial and error and feeling small changes occur inside as you work it out. My only real criticism was that the nuts on the outside do not turn as smoothly as I would like and sometimes seem to get cross-threaded. This really interferes with the opening mechanism because you do have to be absolutely precise in your actions.
|The nut has been released from its case|
|Now it's a Casenut!!|