This entry is part 2 of 6 in the series IPP 31

Flemin’ is an interesting puzzle from Shiro Tajima from the Karakuri Creation group. This fairly plain looking Cherry box with an inlay detail apparently conceals a hidden compartment in its centre, however it’s not easy to find!



As I mentioned the goal of the puzzle is to open the shell and find the secret compartment. Opening the shell isn’t too hard. The outer panels are attached to the inner cube using short dowels which run in grooves in the outside of the inner cube. The way the panels of the inner cube are glued together prevent the outer panels from being removed, and keep the solver going round in circles. Confused? The picture below should help.

Showing how the pegs interact with the inner cube

Showing how the pegs interact with the inner cube

Made from Cherry, Rengas and Mizuki, this take apart puzzle while fairly plain (compared to some boxes we’ve seen from Shiro Tajima) still has a striking appearance to its outer casing. Created back in June 2010, this box has been around for a while now, but the internal mechanism was slightly redesigned and entered in the IPP 31 design competition in Berlin.

I’ve spent quite a lot of time on this box, which was kindly loaned to me by Derek Bosch, and (like Derek) have singularly failed to find the internal compartment. I spoke with a couple of fellow puzzlers about this puzzle, and eventually, talking with Jim Strayer, he pointed me towards the correct technique to open the inner box. It was Jim who mentioned while I was talking to him that the mechanism had been redesigned, and that he can easily open his copy, but was only able to open the IPP copy once.

Our thoughts seem to come down to the mechanism on this copy being locked solid as a result of expansion of the wood. Sadly, it is a potential problem with wooden puzzles, and it seems that the mechanism on this box is rather sensitive to wood movement. Given that I have the puzzle on loan, I certainly didn’t want to force anything and possibly break a puzzle (and my thumb being slightly out of action doesn’t help). Jim did mention that to open the internal compartment the mechanism needs to move very precisely, and I was concerned about damaging what sounds like a delicate internal movement.

So for now, this one remains unsolved. I can say that having spent possibly an hour and a half working on this one (most of that before my accident), that nothing I had tried would have led me to opening it, so it is a challenging box even when you understand its mechanism.

Given the comments of other puzzlers who’ve struggled to open this one, and the possible problems with wood expansion, I’m not sure whether to recommend this box or not. I really like the concept behind the mechanism, and I’m sure if it works, it is both simple, unexpected and very clever. It is a challenging puzzle, so if you’re looking for a puzzle box that is a little unusual, and will not work the way you expect then it’s a great buy. On the other hand, if you get one where the mechanism is stuck, this will frustrate you no end.

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