Eric Fuller (of CubicDissection) has gone and got hisself a laser cutter machiney thing that can… cut… uhh…. lasers? (that doesn’t sound right…) Whatever the thing may do for mere mortals, in the hands of an adept puzzle designer like Eric, it means that we will soon be seeing some cool new challenges coming our way. I had the good luck to solve the first of these: Eric’s newest take-apart puzzle, Pennytentiary, a sequential discovery square of coin releasiness that had me smiling (once I finally stopped being stuck).
Consistent with Eric’s modus opuzzerandi, he makes laser-cut wood look good, with dark-grained panels adorning the top and bottom of the layered sides that are eye-catching and give the puzzle an added sense of class. Notches are spaced evenly around its perimeter, with a centered top “keyhole” in which a coin rests, trapped below 4 diagonal bars that slide easily back and forth with even casual movement. There is nothing else immediately visible, although close inspection may prove that to be a false assumption (a concept that crops up frequently in Eric’s designs). At about 3″ x 0.75″, it feels good in your hands; it isn’t overly heavy but neither is it light and its size is well-suited for most (human) hands. The final version will include a thin layer of acrlyic in one the middle layers, adding some strength and a mixed-medium aesthetic that I am sure will look cool.
When first looking at it, I felt compelled to attempt a pretty basic puzzle move that couldn’t help but come to mind; I assumed it wouldn’t do much of anything and (for once) my assumption proved correct, leaving me with a nice new puzzle that didn’t see to do much of anything (aside from having some potential as a maraca). Of course, this would prove to be not at all true – after a while spent exploring and experimenting, I found a well-designed aha that led me to some good initial progress, giving me plenty to work with while getting me no closer to actually solving the puzzle. I got stuck here for quite a while. And then a while more.
It took some trial & error and careful observation to make sense (cents?) of a short semi-blind sequence that stood between me and further progress; there is plenty of feedback and it is possible to deduce most of what needs to happen, assuming you paid attention during your initial explorations. I eventually got to where I thought I needed to go, foolishly thinking I might be nearing the end, only to figure something out that forced me to laugh at the puzzle’s deviousness. Following on that realization is a trick that I just think is super neat and lends a sense of magic to the solution.
I continued to make considerable progress, working my way through the kind of well-designed sd discoveries and hidden trickery that we associate with Eric’s work. I managed to get nice and stuck (again) towards the end – unsurprisingly, it turned out to largely be my idiocy that was keeping me from overcoming this last hurdle; I was fairly certain of what needed to happen and aware of some of the things that would help it happen, while apparently missing some other thing(s) that needed to happen so that it could happen. Pretty straightforward, no?
I back-and-forth-tracked for a while, thinking I would see something I had missed; the puzzle moves you along quite nicely as you solve it, and I kept looking to see if I had missed a turn. There is a lot to discover in a relatively small package and I had yet to find a purpose for every discovery; the puzzle does an excellent job of communicating where you need to go while simultaneously obfuscating how to get there. I got to be pretty certain of what and where and even how (or so I thought) – but, in classic Eric fashion, even though I was sure I knew the how, I still couldn’t find it…… there was a subtle twist that had me working against myself until I realized I had made an assumption so small I didn’t even realize it was an assumption and that last aha finally hit, allowing me to find the step that had been eluding me only to realize it was not the last aha after all! I thought for sure I would be removing the coin but it turns out there was still another sneaky sequence to suss out before the coin could be captured.
After gleefully removing the coin, I worked my way backwards through the reset – a couple sections still a bit tricky as I continued to develop my understanding of the puzzling at play. After re-solving and re-setting it a couple more times, I can confidently claim to completely comprehend the confounding cadre of coin release mechanisms nestling within this deceptively simple-seeming puzzle. And what a fun puzzle it is! It has an excellent rhythm as you work through several muti-step sequences that rely on discrete mechanisms and well-hidden sd discoveries: imagine if Rex’s best had a child with the Bolt Action series and then went on to marry Ansel and have a brief affair with Free Me 6. And if that doesn’t entice you, then I don’t know what you’re doing reading this post (unless you’re my Mom…. in which case: Hi Mom).
Pennytentiary will probably be the first of a series of coin release puzzles from CD, with ideas for other currency currently in the works. It was originally set for CD’s Feb 2022 release but due to the need to wait for some delayed hardware (and I think perhaps Eric’s admirable and ongoing quest for puzzle perfection) has been pushed to the March 21 release: it looks like this is going to be a pretty exciting drop, with a number of new and re-released puzzles to choose from. There is a chance that the relative efficiency afforded by the (sharkless) lasers may make it a design that will not need to suffer from the same level of scarcity that can sometimes affect other new CD designs – a great thing for newer puzzlers, in particular, who may be taken aback by the fervor that surrounds the typical CD release. Regardless, it is a puzzle you will not want to miss, so plan accordingly when you set your CD release alarm for next week.
Super-Sneaky Grade: Five Sinatras
(click here for more information on the Sinatra Scaling System, (c) John Maynard Keynes, 1944)
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Well, I believe the list is full however I would contact Jesse as some may drop out. His site is:…
where do I buy this?
Absolutely! Can’t wait to see where else it ends up!
Brilliant! I’m happy to see you had fun with it. I was stop #1 (and administered stops 2 and 3),…