Two Lips Are Better Than One – Tulip 1

What do you call a puzzle with a large square corner opening that incorporates 2 lips constructed from triangular half-squares?  Perhaps 2 Lips or maybe even better Tulip.  And if there is more than one design like that, maybe they can be called Tulip 1 and Tulip 2.

Tulip 1 was designed by Osanori Yamamoto in 2019.  It is a 3D apparent cube packing puzzle where the objective is to assemble 3 pieces within a frame such that there appears to be a 3x3x3 cube within the frame although there may be unseen holes within the frame.  Spoiler/No Spoiler – there are vacant voxels when the pieces are packed in the frame.  The frame has a very large and very obvious open corner to add and remove pieces and a single voxel opening in the opposite corner.  My version was made by Pelikan with a Padouk frame and Wenge pieces.  It looks and feels fantastic and is a fun little puzzle with 13 moves to take the first piece out.  Of course, since I consider it an assembly puzzle, it’s really 13 moves to get the last piece in.

As already mentioned, the large opening in the frame has 2 lips.  Why is this of interest?  I would argue that each lip makes its corner open so that the adjacent internal voxel needs to be occupied to satisfy the apparent cube criteria while at the same time being closed so that pieces are barred from being removed there.  Open and closed.

To solve Tulip 1, my initial attempt was to find an assembly of the pieces that would fit within a 3x3x3 space but I ended up with too many assemblies that obviously wouldn’t satisfy the apparent cube requirement.  So I looked for assemblies with a solid corner to fill the large opening while simultaneously having cube in the opposite corner to fill the smaller opening.  This didn’t quite do it for me either, so I instead focused on ways to use the smaller opening.  Now sure, that opening could be there just to force a cube in that corner but I was going on the premise that one of the pieces would eventually have to stick out of that hole.

And thus I found a good candidate assembly that permitted a nice sequence of a few moves.  And if I’ve learned anything from these types of puzzles, if it makes a few nice moves, it’s probably the start of the solution path.  There were a couple of times that I thought I had it solved but there was a move in my path that was not realizable when actually in the box.  I could get it to what I estimated was the half-way point but I couldn’t free the first piece.   Eventually, I realized that the first piece to be removed was not the one I was trying to liberate.  With that new perspective, I completed the solve.

Tulip 1 is another great puzzle from Osanori.  Now to track down Tulip 2.
 

No Problem Puzzles, Update #4

No Problem Puzzles provided over 100 amazing puzzles designs for the community between November 2020 and April 2023 until the tragic passing of Symen Hovinga on 7 April 2023.  Theo Geerinck, the other half of the No Problem Puzzles duo, decided to graciously allow the puzzle designs to be made available to the puzzle community for anyone to print their own copy to keep the legacy alive.  Mr BurrTools himself, Andreas Röver, is currently in the process of verifying and publishing the stl model files over the next several months.  These are being made available on the Printables site under the No Problem Puzzles collection. 

This post continues the review of the No Problem Puzzles as the models are being released.  Since the last review (No Problem Puzzles, Update #3), we have another 4 No Problem Puzzles to review.  They consist of Black Cat White Cat, Pizza Panne, Donut Perplex Junior, and Twist Them In.  For this batch of puzzles, the specified level of difficulty varied between 2 and 4 on a scale of 5.

Black Cat, White Cat

This puzzle addresses the problem of herding cats.  It’s not difficult to determine how they need to be arranged but a real challenge to get them to all cooperate by coming together.  The difficulty level of 2 is a compromise between the ease of determining how the pieces are oriented and the difficulty of putting them together.

Black Cat, White Cat consists of black cats and white cats.  6 of each.  All identical in shape.  2 to a side constructing a cubic box.  It’s up to you to arrange the distribution of the colors but I would recommend having a black and a white cat on each side for the best visual appeal.

It’s fairly simple to get all the pieces in place until you get to the last one.  Then you realize that an additional pair of hands or 2 would come in handy to be able to slide all the pieces together.  Only having 1 pair of hands, I failed multiple times to form the box and ended up with partially completed subsets collapsing.  I needed a better way and finding that way became the challenge to solve.  As evidenced by the photos, I did find that better way and ended up with a rather solid box.  And once together, I really doesn’t want to come apart.  Of course the challenge requires a different way to take it apart.  This is the way!

Pizza Panne

7 Pizza Slices.  You know what that means.  Yeah, I don’t either.  Who cuts a pizza into 7 slices?  And it doesn’t make any more sense when you realize that 5 slices seem to make a complete pie.  In any event, you have the task of packing 7 pizza slices from a deranged pizzeria into a pizza box.  The puzzle claims to have a single solution but I’m not sure how this can be determined.  The level of difficulty is rated as 3 on a scale of 5.

In addition to the 7 slices and the box, there are garnishes for the pizza including salami, mushrooms, and olives.  I didn’t originally plan on adding the garnishes since it doesn’t impact the function of the puzzle but since I was printing other pieces in multiple colors, I just added them to those prints.  I have to admit that it does look a lot more appealing and it did add some nice heft to the pieces.

This one is tricky.  The tricky part is knowing if you have solved it or not.  Adding 6 slices to the box is trivial and that last piece just needs to be folded to get it in.  Unfortunately, these pieces don’t fold too well.  It takes a while of jostling the 6 pieces around before you eventually create a space that seems like it would take the last piece.  On my first attempt, I had a configuration that looked like the last piece would fit if given a little force to wedge it in there.  Suspecting a more elegant solution, I forgoed (take that you forewent snobs) the brute force physical cramming technique that I employ for packing suitcases and continued the search.  I was eventually rewarded with a configuration where the last piece slid in with a little friction but no force to lock everything in place.  Solved!  However, when I put the pieces back in after taking the blog photos, I found a different solution where the pieces are still loose in the box.  I suspect that this last configuration may be the intended solution.

Donut Perplex Junior

I originally assumed that this puzzle was a simplified version of Orange Perplex that was covered in the last blog, but in fact it is a decomplexified version of the senior Donut Perplex consisting of 13 pieces that was entered in the International Puzzle Party (IPP) Nob Yoshigahara Puzzle Design Competition in 2019.  I didn’t see the senior version originally offered on No Problem Puzzles so I don’t know if we should expect to see it released as part of this series.

I can see why the puzzle was knocked down to 4 pieces since it conveniently provides a top, bottom, inside and outside.  I found it easier than the stated difficulty level of 2 would suggest.  Certainly a puzzle for beginners.

Twist Them In

A restricted opening packing puzzle with a twist.  Not only do you have to pack the pieces within the frame but you have to accomplish this whilst being able to rotate the 2 halves of the frame.  With a difficulty level of 4, you know it’s going to be interesting.

Twist Them In consists of a 3 piece frame and 4 pentacubes that have to be packed inside.  The 2 halves of the frame are connected but can be rotated.  One half has an open side but it has a sliding cover that can only be removed when the halves are rotated 90, 180, and 270 degrees.  However the lid is locked firmly in place when the 2 halves are aligned at 0 degrees.

This one is a great challenge even with the experience gained from solving the prior puzzles in this series.  It’s obvious that the last operation in the assembly is to add the cover and rotate the halves so that they are aligned.  Analyzing the impact of the rotation on the space within the frame provides a good starting point on how the pieces need to be placed within the box.  Even so, it took me a while to finally come up with the winning combination.  This is my favorite No Problem Puzzles puzzle so far.

This is the fourth blog post continuing the review of No Problem Puzzles as they are released on the Printables site under the No Problem Puzzles collection.  The prior posts and the puzzles that they cover are:

Preserving a Legacy – No Problem Puzzles

• Sandbox
• Swinging Lid Tray
• 3U Frame

No Problem Puzzles, Update #2

• Turn Around
• Unmatch Box
• Quinta Cuboids
• Dizygotic

No Problem Puzzles, Update #3

• Boon
• Sliding Doors
• Pivot Window
• Orange Perplex
• Salmiak
• Vixen’s Antlers

If you don’t have a 3D printer, you can obtain copies of these puzzles from Nothing Yet Designs based in the US or the PuzzleguyStore based in the EU.

2-Maze Challenges, Double – CrossRoad

Every once in a while you run into a puzzle where the pieces seem to be at cross-purposes with one another, forcing you to battle on until you are cross-eyed.  You may even be tempted to crosscheck the starting position with the challenge descriptions by cross-matching maze plate colors and orientation indicators.

Of course I’m talking about CrossRoad designed by Brian Kren and made by Puzzled By Piker.  I bought it because I thought the label said it was a crisis-causing amazing challenge.  It turns out that it was a criss-crossing multi-maze challenge.  All-in-all, it provides 62 amazing crisis-causing criss-crossing multi-maze challenges to conquer.

The puzzle is 3D printed and consists of a frame, 7 maze plates, and 2 sliders.  The frame holds 2 of the 7 maze plates at a time and the different combinations of maze plates and starting slider positions provide 62 challenges to solve.  The number of moves to complete each challenge ranges from 7 to 67.   

The included documentation identifies the 2 plates required for the each challenge, their orientation, and the location of the sliders for the starting position.  Each plate is printed with a different color for easy identification and has 4 debossed symbols used to identify the orientation of the plate within the frame.  

I originally expected that the 2 plates would move in different directions, one along the x axis and the other along the y axis, like Goodbye (Say Hello to – Goodbye).  However, both maze plates move along the same axis, which also makes them easier to manipulate.

Each slider consists of 2 pieces that are magnetically connected so that they can be separated to easily insert them through the frame and maze plates.  The sliders move within the cross of the frame and through the mazes as both the sliders and mazes are moved.  Do I even have to mention that the ends of the sliders get in the way of each other.

Each maze plate has a single exit point and the goal is the manipulate the plates and sliders so that the plates are eventually removed from the frame.  Each challenge states the minimum number of moves to solve the challenge but you are certainly welcome to exceed that number if you so desire.

With the easy-reset magnetic sliders, setting up the challenges is quick leaving you to focus on the challenges themselves.  I found that as I worked on the challenges, I developed a feel for how to traverse the mazes and was able to solve them quicker (for the same difficulty level) as I went along.  The cross and the windows in the frame provide ample viewing of the mazes to chart your way.  The first objective is to try to determine which plate needs to be removed first and you can easily guess wrong.  Needless to say, a lot of backtracking may be involved.  If you get hopelessly lost, it only takes a couple of seconds to reset it back to the beginning.  I didn’t find it necessary to do this, but there were several times I was going back and forth trying to get the sliders past certain blocked moves.

I haven’t completed all 62 challenges, but I can say that CrossRoad is a nice design and the implementation is well done.  Thank goodness for the easy-reset sliders.

Since this puzzle utilizes 2 mazes at a time, I’m tempted to refer to it as Double CrossRoad.  Especially since the pieces always seem to keep going back on each other.  Of course there are 2 sliders as well so maybe it should be Double Double CrossRoad.  And for variations in the future?  Triple Double CrossRoad anyone?

Although the packaging and included documentation studiously avoids providing any means of contact including a website address, this puzzle was made available on the Puzzled By Piker Etsy Shop.  It is currently unavailable but you can purchase the STL model files for a nominal fee to 3D print a copy of your own.

Puzzle or Just Puzzley? – Treasure Box

What’s wrong with this world?  How come we don’t have puzzle gift registries?  Why do puzzle gifts have to be received with puzzled expressions and that awkward silence?  Followed by the well-meaning gift giver breaking the silence with, It’s a puzzle.  Of course it’s a puzzle, but … but ... but just … why?  Most people recognize this minefield for what it is and avoid it altogether.  No winners ever emerge from this minefield.  At best, you are a survivor.  If you’re really unlucky, you can even end up as collateral damage at a buddies party.  Jimmy said that his NPSO got him a nice puzzle that he just loves so I got you one too! (NPSO – Non-Puzzling Significant Other).  Your nicely constructed facade just fell over and flattened your soon to be ex-bud.  But sometimes, just sometimes, you get lucky.

Treasure Box is a laser-cut 3D Wooden Puzzle by ROKR.  I received it as a birthday gift from my mother.  It’s not a puzzle but it’s puzzley.  On the other hand, the instruction manual says that it’s a 3D Wooden Puzzle.  On the other, other hand, it’s more of a straight-forward combination look box with very nice mechanical movements featuring many gears.  Then again, if you have another hand to spare, it has a lot of parts that have to be put together, so maybe it really is a puzzle that would fall under the put-together category.  If that’s the case then I definitely cheated in solving it by closely following the 34 page solution manual.

It arrives as 158 very fine and precisely laser-cut pieces.  The pieces are unassembled and in fact are still nestled in the sheets that they are cut from.  6 sheets of pieces to be exact.  Everything is nicely labeled and the pieces are easy to separate from the sheets.  The connecting tabs are amazingly small, work well, and remnants are easy to sand down.  A small bit of wax is also included to help lubricate some of the moving parts.

The box consists of 2 compartments.  A small compartment secured by an iris opening and a slightly larger compartment secured by a combination lock and 2 keys.  Opening each compartment is separate from the other.  As a future improvement, I would suggest making the iris compartment large enough to hold the keys required to open the second compartment.  The iris compartment would also be a good place to put either the combination or a clue to the combination required for the other compartment instead of just writing it in the provided space on the bottom of the box.  Just sayin’.

The box does a nice job of being decorative and highlighting the geared mechanisms.  Many windows are included to provide views of internally moving gears.  I was really impressed with the quality and final appearance of the box.  I still find it amazing how well laser-cut pieces can be bent around corners.

One of the first steps is to put together a gear assembly and it was a good choice to lead with.  It was simple to build and at the same time very satisfying.  Putting the gears together, it seemed tight, but when it came time to test it, it was very smooth and impressive.

No glue is required but beware, I recommend NOT disassembling it as you may break pieces trying to take it apart.  How do I know.  I had to glue a spot that I over-stressed while trying to rearrange something.

Assembly is mostly following a straight path defined by the directions in the 34 page Assembly Instruction manual.  However, there is one fork in the road.  For the combination locking mechanism, you need to decide whether to make it truly lockable or to leave a bailout in the unlocking procedure in case you forget the combination or have an issue with the build.  I’m embarrassed to say that I chose to leave the bailout in and regret doing so.  If I had the opportunity to do it over, I would definitely remove it.  And as I mentioned earlier, you don’t really want to disassemble the puzzle to reconfigure it, which was what I was originally thinking when I made that decision.

The instructions do a good job of describing the construction process and include many drawings of the assemblies and sub-assemblies being built.  Various warnings are provided in the diagrams when needed such as when to apply wax, when to sand, and when to pay special attention to the orientation of the pieces to ensure that a laser-engraved side faces the proper direction.  There were only a couple of times where I said to myself, I don’t get it, and had to resort to thinking.  I’m recovered enough now to finally get this blog out a year after finishing the build.

Most things went together easily and extremely well but the use of tiny laser-cut pins was a pain.  They were difficult to hold in place, needed to be forced into holes too small for them in order to provide a permanent frictional fit, and occasionally broke due to the stress induced by the aforementioned difficulties.  Luckily, plenty of spares are provided.  Thank goodness for play-testing feedback.

Although I don’t consider Treasure Box to be a much of a puzzle, I thoroughly enjoyed building it and seeing how how the mechanisms were implemented.  Being the first model of this nature that I built (Yes, I did it before the Birthday Cake (Surprise! – Birthday Cake)), I found the building of a working 3D mechanical model from 2D laser-cut wood a fascinating process.

If you are not familiar with how a combination lock works, this is a great opportunity to see the mechanism in action as you build and test it.  Since you are required to set a combination, you get to see first hand how that is implemented.

And what about the idea of a puzzle gift registry?  I goggled it after drafting this blog and to my great surprise, I found one.  Brilliant Puzzles supports a Gift Registry capability!  A sure sign that there’s still some hope for the world.

The Case Of The Perplexing Orange Spaghetti – Orange Perplex

The Crime Scene

It was a day, a day like any other day as I went about my daily routine.  The coffee tasted like yesterday’s cigarettes and the newspaper regurgitated the same old political woes destined to repeat for eternity.  Just a normal day.  And then it, walked into my life looking like bad news needing a place to roost.  I could already tell it was not going to end well.  These things never have happy endings.  Investigating the scene of the crime, I could see the guts of the victim decorating everything in the vicinity.  From the state of the remains, it appears that the victim was knocked over, not once but several times as it tried to recover but it never had a chance. 

And thus begins the tale of The Case Of The Perplexing Orange Spaghetti.  How did the victim get knocked over?  Why wasn’t it able to hold on?  Why were there no witnesses?  What was the motive?  Where was the weapon?  Was the room locked?

The principle point of this pitiful plot is how the simple printing of a recently released No Problems Puzzle progressed into a perplexing Orange Perplex problem.  This is the very same Orange Perplex puzzle that was recently reviewed a couple of weeks ago (No Problem Puzzles, Update #3).

Take 2

Orange Perplex consists of 15 segments that are divided into 5 pieces with each having 3 segments.  The segments of each piece are connected at a different level within the orange from the other pieces.  It arrives as a print-in-place model.  That means that it is printed with all the pieces in the solved configuration.  It’s like magic.  But not the type of black magic that transforms an orange into spaghetti.  Squash maybe, but not an orange.

I decided to eschew the suggestion to print the puzzle with rafts and supports.  Normally, I get excellent adhesion when 3D printing and avoid rafts.  I always end up regretting using them and I hate having to deal with raft rash.  However, sometimes you just can’t avoid it.

The problem is not that the model is print-in-place, but that a major portion of the orange segments hang out over the base before they can be counterbalanced when connected with other segments.  For me, this resulted in segments falling out from the puzzle.  And what does the 3D printer do when what it’s printing on takes a walk?  It keeps right on going assuming that it’s there.  Unless of course your printer has that fancy shmancy automatic spaghetti detection feature.

When I checked in on my first printing attempt about halfway through, one of the segments had detached from the plate and rolled out.  I was very surprised that the adhesion failed.  Should I kill the print?  Nah, by this time, some spaghetti had filled the gap and the print was still proceeding nicely.  I would just have to reprint that one piece.

Singled Out and Flipped

When I came back at the end, I was greeted with a full plate of orange spaghetti.  What happened?  Well, it appears that another segment failed.  I’m guessing that it was filling that segment with spaghetti until it was able to continue.  However, the spaghetti filling might not have been very stable and that piece may have tilted.  Once that happens, you’re doomed.  Tilting means one side goes down but the other goes up.  The part sticking up will then catch the housing of the hot end or the hot end itself.  Best case scenario, that part gets pushed to the side or the entire print gets detached from the plate.  I don’t even want to think about the worst case scenario.

Having learned my lesson, I reprinted it with rafts and supports.  And guess what?  A segment still fell out.  Very disappointing but at least it failed near the end and spaghetti supports aided in it’s recovery.  Only 1 piece was affected and I reprinted that one upside-down so that the bridge connecting the 3 segments occurs early on.

In examining the segments, they all appear to have fallen out when the bridge was just being formed.  In all cases, the thin lip of the forming bridge appears to be curled up which may have led them to be knocked loose by the hot end.  I’ll have to keep an eye on this in the future.

And finally, was the room locked?  No.  But my printer is enclosed and the door was shut, so there should have been a consistent temperature within the enclosure and across the plate.  Of course, I’ve never tested the temperature gradient across the plate.  Does anyone really do that?

Orange Perplex

Flattenry Will Get You Nowhere – Soma Tray

Over the last several years, the Soma Cube developed by Piet Hein has suffered a lot of abuse.  Since the 7 pieces forming a cube has 480 solutions, various tortuous methods have been employed to jettison 479 of them leaving the puzzle with a unique solution.  One of these time-honored methods is to squash it.  This involves picking one of the 480 (or maybe more appropriately 240 to avoid the mirror) solutions and scaling it down along one of it’s 3 dimensions.  To be quite honest, I do not know if every combination results in a unique solution but I’ve always assumed that squashing the Soma cube is a uniquifying process.

Soma Tray was designed by Rick Eason in 2016 and used as his exchange puzzle at the 41st International Puzzle Party in 2025, suggesting it sat on the shelf for 9 years.  In fact, it looks like it was buried on a shelf resulting in a somewhat flattened appearance.  OK, a very flatted appearance.  My guess is that it’s flattened shape under a heap of other puzzle prototypes had doomed it from seeing the world.  However, as we now know, it successfully escaped and made itself know. 

The puzzle consists of the 7 squashed Soma pieces with 1 dimension about a quarter of the size of the other 2.  All the pieces are flat with 5 of them having a single squashed cube added on top.  As the name of the puzzle would indicate, there is also a tray.  The tray is 5x3x2 with the 2-layer Z dimension representing the flattened dimension.  There is also a 1x3x1 shape affixed to the bottom of the tray, 1 unit from the end.  This provides a 2-layer 3x3 area on the left and 1x3 area on the right.  Both the pieces and the tray are made from laser-cut veneered wood.  The tray also has the name of the puzzle as well as additional information debossed along the rim of the tray.

Soma Tray comes with 2 challenges.  The first is to build a typical, albeit squashed, Soma in the 3x3 area of the tray.  I’m assuming that this is a uniquified Soma cube but I didn’t verify that.  The second challenge is to fill the tray with all 7 pieces.

The puzzle arrives nicely packed in the tray except for a single square sticking up from the tray.  Needless to say, filling the tray is not achieved by simply flipping that piece over.  Since the tray arrives with 1 piece sticking out, I obviously wanted to fix it and started with the second challenge.  I immediately dumped the pieces out to start with a clean state and embark on fixing the problem.  I know I said that you couldn’t just flip over that one piece in the original packing state to solve it but honestly, I just assumed that.  Maybe the joke is on me.

Since the right side of the tray limited that pieces that could be placed there, that’s where I started.  This definitely turned out the way to go as the spillover into the 3x3 side helped put the final pieces in place there.  I should also note that I solved it a second time and ended up with the a mirror image of the first solution.

Having completed the first, or technically, the second challenge, I proceeded to work on creating a squashed cube.  After some random attempts, I decided to think about the relationship between the pieces with and without the extra cube.  This gave the direction that I needed and soon after, I had a squashed cube nestled in the tray.  Since the other challenge had a mirror solution, I checked the cube as well and sure enough, the solution to this challenge had one as well.

Soma Tray is not a difficult puzzle but I did enjoy the challenges.  I also like how the pieces store in the tray.  And you can never have enough Soma variants.

No Problem Puzzles, Update #3

No Problem Puzzles provided over 100 amazing puzzles designs for the community between November 2020 and April 2023 until the tragic passing of Symen Hovinga on 7 April 2023.  Theo Geerinck, the other half of the No Problem Puzzles duo, decided to graciously allow the puzzle designs to be made available to the puzzle community for anyone to print their own copy to keep the legacy alive.  Mr BurrTools himself, Andreas Röver, is currently in the process of verifying and publishing the stl model files over the next several months.  These are being made available on the Printables site under the No Problem Puzzles collection. 

This post continues the review of the No Problem Puzzles as the models are being released.  Since the last review (No Problem Puzzles, Update #2), the next 6 No Problem Puzzles have become available.  They consist of Boon, Sliding Doors, Pivot Window, Orange Perplex, Salmiak, and Vixen’s Antlers.  For this batch of puzzles, the specified level of difficulty varied between 1 and 3.5 on a scale of 5, with 4 of them being a level 3 or higher.

Boon

This months review celebrates the addition of 6 new No Problem Puzzles designs.  Boon times indeed.  And the first boon is Boon consisting of 3 pieces that need to make an apparent cuboid within a frame.  To make it interesting, the frame is not fixed but consists of 2 intersecting pieces.  No rotations are required, but I can attest to the fact that there are rotational shortcuts.  My recommendation would be to avoid them and find the more elegant non-rotational solution requiring 8 moves to remove the first piece.  It is rated at a level of 3/5.

Sliding Doors

When one door closes, another one opens.
    -   Alexander Graham Bell

Sliding doors is awesome and has a very nice solution.  It does suffer a little from potential shortcuts but if you studiously avoid rotations, i.e., tilting pieces, the Cartesian path is very good.  Unfortunately, some of the rotations are very easy to perform and you will be tempted even as you look at it and say to yourself, I really shouldn’t do this.

Sliding doors is an apparent cube 3D packing puzzle with the goal of packing the 3 pieces within a frame.  And like many of the No Problem Puzzles, the frame has moving parts (this is why we like the No Problem Puzzles so much).  In this case, 2 of the sides have a sliding door that gets in the way of inserting and moving pieces.

The solution involves shifting back a forth between the sliding doors.  Since the tops of the doors come to rest on the pieces within, sometimes only the thickness of the door will keep an invalid move from happening.  Don’t be tempted to cheat the moves by tilting the piece over the door edge.  This will make sense once you start playing with it.

With a difficulty rating of 3.5/5, you know that you can expect a good time.

Pivot Window

OK, I’ll admit it.  I struggled on this one.  The prior puzzles did a good job of setting me up and leading me astray.  I thought I had learned some key movements that would guide me to a quick solve and in the end all I learned were things not to attempt with this one.

Pivot Window is a 3D packing, restricted opening puzzle.  The goal is to cram 5 tetracubes within a 2x3x4 box.  The box has a 2x3 lid that not only rotates about it’s midpoint lengthwise, but the pivot point is on a track allowing the window to move back and forth in the opening.  This window adds a paneful element to the solution.

I spent a lot of time trying many things outside the box before I actually tried putting something in the box.  Don’t be like Zen.  Do some experimenting with the pieces and the box.  It’s well worthwhile. 

There are supposed to be 2 solutions!  How can it be so difficult?

I got all excited when I finally got all the pieces in the box.  I had a good 5 minutes of exultation before I realized the that solution was not an apparent cuboid.  The instructions didn’t say it had to be an apparent cuboid but the picture in the original listing showed the box looking completely filled and that had been my original goal albeit temporarily forgotten.  Ugh!

I’ve also found a second way to pack the pieces in the box but unfortunately, I’ve yet to discover an apparent cuboid solution.  If the intended Pivot Window solution is not an apparent cuboid, I agree with the 3/5 difficulty rating.  If it is supposed to be an apparent cube, I think the rating should be higher.  At least that sounds better than degrading my puzzle solving prowess level.

Orange Perplex

Orange Perplex is a perplexing orange consisting of 15 segments that are divided into 5 pieces with each having 3 segments.  It was entered in the International Puzzle Party (IPP) Nob Yoshigahara Puzzle Design Competition in 2019.  The goal is to pack all 5 pieces together to form a complete orange.

The segments of each piece are connected at a different level within the orange from the other pieces.  The 2 pieces with the connections near the outside can be used on the first or fifth level depending on how it’s oriented.  Similarly, the 2 pieces with the connections halfway to the center can occupy the second or fourth level.  The final piece always occupies the center level but can go in 2 different ways.

Picking the filament color for this one was a breeze but my NPSO made me use orange instead of perple.  And I did have some printing issues that I’ll address in a later post.  If you’re undecided, my recommendation would be to definitely use supports with a raft.

Unfortunately, I did not come up with a clever way to solve this puzzle and ended up just cranking through the permutations until it all went together.  For me, the 3/5 difficulty level was an indication of the time needed to solve it as opposed to figuring out an elegant solution.

Since it’s print in place, it’s easy to distinguish the top from the bottom, which reduces the complexity of the solution.  However, you can always print a second copy upside down and swap 2 of the pieces between the copies.  Or you could just take the 2 pieces with the uppermost connections and flip them upside down and print them alongside the original 3 pieces.  It’s up to you whether you want to be nasty when you share it with someone else by saying that it’s a print in place puzzle while failing to mention that you swapped some from a flipped print.

I didn’t realize until I was ready to publish this blog that I failed to print the Orange Peel.  Yes, there is a spherical shell that splits in half that you can use to store the puzzle.  Obviously, it’s not required to solve it.

Salmiak

Salmiak is a type of licorice (or liquorice if you’re from the other side of the pond) made with Salmiak salt that is popular in northern Europe.  This is the second salty licorice puzzle that has been featured on ZenPuzzler.  If you have a good memory, one of the Picnic Basket puzzles (A Tisket A Tasket, Puzzles In – Akaki’s Picnic Baskets) was named Salmiakki, which is the Finnish spelling.

Salmiak the puzzle is a 2D 5x5 packing puzzle with 6 pieces.  However, the puzzle has been skewed on all 3 axes.  Why?  Because it messes with your squary mind.  I always find it fascinating how even though the skewing reduces the possible orientation of each piece from 8 to 2, it still seems harder.

Although black would certainly be the most appropriate color for the pieces, I used the next closest thing, Orange!  It looks so nice!  It looks particularly nice as a diamond standing up on end and probably deserves a stand to display it that way.  There is also a lid that can be printed for the tray but I can’t comment on how well it functions since I decided not to print it.  The stl file for the pieces was especially well thought out.  And the stl file for the lid was especially not well thought out.  If you decide to print the top, don’t forget to turn it over before printing.

Salmiak has a difficulty rating of 2, which seems about right.  However, it’s really difficult to gauge because sometimes you get lucky and most of the time you don’t.  For me, it was a relatively quick solve but a fun little challenge.

Vixen’s Antlers

Vixen’s Antlers consists of 6 pieces that form a hexagonal box.  Or is that 3 pieces that form a hexagonal box.  It’s really up to you.  The intent is for you to print 6 pieces and then glue them together in pairs to form 3 pieces.  It is also recommended to use 2 different colors for a nice visual effect.

As a 3 piece puzzle, the solution requires coordination motion to solve and has a difficulty rating of 1/5.  And as a 6 piece puzzle, it’s even easier since it no longer requires coordinate motion.  It may not be difficult but it’s very appealing, displays nicely, and is a great example of a coordinate motion puzzle for non-puzzlers.

This is the third blog post continuing the review of No Problem Puzzles as they are released on the Printables site under the No Problem Puzzles collection.  The prior posts and the puzzles that they cover are:

Preserving a Legacy – No Problem Puzzles

• Sandbox
• Swinging Lid Tray
• 3U Frame

No Problem Puzzles, Update #2

• Turn Around
• Unmatch Box
• Quinta Cuboids
• Dizygotic

If you don’t have a 3D printer, you can obtain copies of these puzzles from Nothing Yet Designs based in the US or the PuzzleguyStore based in the EU.

No Force Required – Gentle Interlock

It’s the season.  If you’re from Jersey, juno what I’m talkin bout.  And puzzlers will soon be reaping their own bountiful harvest of packages brimming with wonderful new acquisitions.  Last week was the momentous conjunction of events in the puzzleverse – Baxterweb, Cubicdissection Marketplace, Puzzle Paradise, and Mega Free Giveaways on the Mechanical Puzzle Discord (MPD).

The free giveaways on MPD have taken a life of their own and provide a means of repurposing homemade personal use copies of puzzles that would be impolite to sell.  Many are 3D printed and there has recently been a wave of some realized via LEGO.

Today’s puzzle is Gentle Interlock designed by Junichi Yananose from Pluredro.  Junichi has many more buyers than puzzles, resulting in his puzzles selling out in minutes or even seconds when they are released.  And he rarely has a second release of a puzzle since he is always working on the next design.  So he does his best at discouraging people from buying his puzzles.  In the case of Gentle Interlock, although there were prototypes of level 10 and 11, Junichi opted for the design with the lowest level - 6.  In his defense, he opted for this design stating that it had better playability.  As brilliant as all Junichi’s designs are, I took a gentle pass.

Fast forward to this year’s New York Puzzle Party (More PPing in the Big Apple – NYPP 2025)  where someone brought a copy of Gentle Interlock that gently tickled my brain and reminded me of this puzzle and how much I like burrs.  With that thought worming it’s way through my wormy mind, I eventually got around to pulling one from the replicator.

Gentle Interlock initially looks like a typical 6 piece burr but on closer inspection one end of each piece appears to be twice as large as expected.  This pushes the pieces away from the center thus providing more space to add bits where the sun don’t shine.  It also adds a nice bit of confusion since it orients what you may consider the center-facing side of the piece towards the side or even away from the center.

Since this puzzle was extracted from the replicator, it arrived unassembled.  Perfect!  The assembly is not trivial and it took me some time to work out where all the pieces needed to go and then how to assemble them.  Junichi certainly hit the playability goal he was aiming for.  However, I’m left wondering what the higher level designs would have been like.

Gentle Interlock was a fun puzzle and maybe one day, it will end up in a free bundle on MPD.

In Mint Condition – Dr. Bell's Curiously Warped Mints

Dr. Bell’s mind is jam packed with mind-blowing packings.  Why, sometimes he’s imagined as many as 6 impossible things before breakfast.  His warped sense of humor has now brought us a minty fresh take on edge beveled cube packing.

Dr. Bell's Curiously Warped Mints was developed by George Bell and used as his exchange puzzle for the 41st International Puzzle Part (IPP).  Each of the 6 pieces is 3d printed in a different color and comprised of 4 warped edge-beveled cubes.  The objective is to artfully cram all the pieces within an accompanying tin.  The type of tin that you would expect to find a nice assortment of mints to enjoy.  However, you are not expected to enjoy these mints.  The tin explicitly warns to not eat them.  So then why are they made with yummy colors like grape, blueberry, raspberry, lemon, lime, and licorice?

To get you started, some of the pieces are already in the tin and you only have to add the remaining 2.  Of course, I dutifully took all the pieces out and separated them before starting on my journey of 1000 missteps.

Being warped always seems like it should make things easier but it always feels like the opposite.  Examining the pieces, I noticed some interesting clues that I filed for possible later use and proceeded on without them.

The first step in these types of packing puzzles is to determine what type of packing structure is required, i.e., how the web cubes are oriented.  I struggled a while working on a packing orientation that would allow the cover to go on.  Then I unfortunately discovered something significant.  I was proud.  Or I should say the puzzle was proud of the lip of the tin.  I thought that this was a problem until I finally realized that when you placed the lid on, it did not rest on the top lip of the tin and providing a little additional space.  And after considerable effort I was able to pack all the pieces except 1.

It turns out that what I thought was a problem that wasn’t a problem was a problem.  Eventually I reread the goal and it said that the cover has to be screwed down, which screwed the packing approach that I was trying to accomplish.  I hadn’t even realized that the lid was resting on threads.  I now had nothing to be proud about.  Dejected,  I went back to the drawing board mumbling to myself, screw it ... screw it … screw it.

I eventually discovered another packing structure with a lower profile that would allow the cover to be screwed shut.  I also made heavy use of the clues that I had remarked on earlier.  At one point, I had a 3 subassemblies that looked like they would go together to solve the puzzle but would require coordinate motion to accomplish that.  Of course it would require coordinate motion coming from Dr. Bell.  However no matter how hard I tried, I was not dexterous enough to get everything lined up and moving like I wanted it to.  Curiouser and curiouser!  I eventually convinced myself that they would not go together using coordinate motion.  I was so close to victory, I could almost taste it.  Stepping back a bit, a minor tweak allowed me to assemble the pieces within the tin and screw it.

Once all the pieces are assembled, it truly resembles a tin of mints that are all stuck together and won’t come apart as if they were one giant enticing gobstopper.

It’s a clever puzzle and by the time I finally solved it I have to say that I ended up licking it.  Thanks Dr. Bell.

A Solid Challenge? – NotchedTIC

ARC TICs are extremely cool puzzles and most of the ones that I have solved have been 4x4x4 cubes.  One notable exception being MagellanTIC (Space, The Final Frontier - MagellanTIC), which is a 5x5x5 apparent cube and an awesome experience.  And now we have NotchedTIC, which is a non-apparent cube.

There’s just something so satisfying about solving a Turning Interlocking Cube (TIC).  However, it’s been a while since I’ve tackled a TIC by Andrew Crowell, aka ARC Puzzles {https://arcpuzzles.com}.  In 2020, I reviewed a different TIC by Andrew each month, with December’s being CagedTIC 1 (Ending With a Beginning - CagedTIC 1).  That post also had the links to the other 11 TIC posts for that year.  Although there were more ARC TIC posts, they weren’t as frequent and eventually trailed off.  How did that happen?  Well sometimes I get easily distracted. SQUIRREL!!!  Squirrel? Squirrel squirrel squirrelsquirrelsquirrel…

NotchedTIC is a 3D printed 6-piece 5x5x5 TIC designed by Andrew Crowell.  It gets it’s name from each edge having a missing voxel in the center.  And the puzzle arrived disassembled, which is my preference for attacking most burr puzzles.

The pieces to this puzzle fell into place fairly quickly.  Piece placement was obvious and pieces were able to be added 1 at a time with backtracking where needed to add a new piece.  Assembling the puzzle takes 28 moves with about a dozen of them required to add the last piece.  Along the way, 2 rotations are required but you don’t need to worry as they are not complex and obvious when needed.  In fact when taking the puzzle apart, the rotations will execute by themselves as pieces scramble to evacuate the TIC infested region.

I would classify NotchedTIC as more fun than challenging for experienced puzzlers.

Although I bought my copy second hand, you can buy the 3D Printable STL files for NotchedTIC and 5 other 5x5x5 TICs as part of a 6-puzzle set from Andrew’s site, ARC Puzzles.

Mixolometragrobology – Get in the Spirit!

Mixolometagrobologist Steve Canfield decided to go all out for his exchange puzzle in last year’s International Puzzle Party (IPP) and deliver a Sequential Discovery (SD) cocktail for us to savor.  After all, he was the host and wanted to make a big splash by leveraging his vast knowledege of puzzle Boxes and Booze to create an intoxicating journey with a bittersweet ending.  To aid him in this grand endeavor, he enticed puzzle genius and master craftsman Lee Krasnow to flesh out the intricate details that make this puzzle shine.

Get in the Spirit! consists of multiple layers of intrigue.  The outside is turned from aluminum with a Walnut and Hard Maple center ring to provide a classy classic look.  This shiny work of art may not look all that difficult but aluminum parts encapsulating various devious movements ring true.  After I solved it, I tested this in a manner that I’m sure will resonate with everyone.  I suspended both and struck them to verify the sonority of each.  Both produced a very nice tone with the top straining longer to sustain its note.

As for the goal, the shaker shaped tag simply said Get in the Spirit!  Preparing for just that, I happily embarked on my SD spiritual journey.  But where to start?  It’s a shaker!  You’re supposed to shake it, right?  Right?  Not so much.  Tilting and rotating will do.  As a matter of fact, I’d recommend not shaking it.

Through the holes in the top, you can just make out a red logo on a dark green background but don’t strain your eyes.  What could it be?

All three parts of the shaker seem to rotate freely and as you twist it and move it around you can hear things moving inside.  I was starting to fear that it might be one big marble maze and was particularly worried about the bottom portion.  I hear that people sometimes get lost in their cups.

With a little bit of exploration, the first move can be found, revealing the first glimpse of the interior.  I’m embarrassed to admit that this initial freebie move took me a full 10 minutes but I was going to savor this journey, by golly.  And with a little bit of additional work, the outer shell was peeled away to reveal … the next layer.

The interior is mostly 3D printed garnished with some metal hardware to facilitate making things more difficult.  Welcome to the inner circle, which sports 5 windows around it’s circumference.  And the inner circle has it’s own inner circle with it’s own set of windows.  It’s obvious that a lot of additional work went into making the design aesthetically pleasing instead of resulting in a strictly utilitarian design.  When the windows line up, you get a glimpse of what is waiting inside.  Through another opening, you can get a good look at a trapped coin although there doesn’t seem to be a way to easily remove it.  

Now you have a clear view of that red logo on top, which kind of looks like the top of a bottle.  With some effort you can get the top of the bottle to stick out.  It seems like it would make a great handle to rotate the bottle inside, which I did.  Rotating clockwise works great!  Rotating counter-clockwise not so much.  It really is a bottle and proceeded to dribble it’s contents in my lap.  I obviously don’t know how to hold my liquor.  At least I managed to limit the damage by quickly retightening it and vowing to never make such an obvious mistake again.

With just one drink under my belt, I stopped making progress.  I hit THE WALL!  At this point I kept trying everything over and over and getting nowhere.  There seemed to be a lot of enticing round holes that were trying to tell me something, but all I was getting was a buzz.  Eventually, I packed it back up and put it to the side for a while, a long while, months, in fact it’s been about a year.  How embarrassing!

After taking it back out after all that time, I blocked out a weekend and quickly (or at least quicker than the first time) found myself back at the wall.  After spending another considerable amount of time looking for a way forward, I finally succumbed and asked permission to do something that I was reluctant to do.  And I received the rare go ahead.  Usually this is followed by lots of laughter as I try it.  However, this time I was lucky.  In hindsight, the puzzle does provide a hint on how to get over that wall but like all good puzzles, you don’t recognize it until it’s already too late.

After a few more moves, you eventually end up with a token that is a bottle of your accomplishment.  Or is it a bottle that is a token of your accomplishment.  In any event, you wind up with both a token and a bottle of spirits.  If you are adventurous, you can take everything completely apart into the dozens of components that make Get in the Spirit!.  

The reset takes much longer than the solve but that’s basically because you just freed up a nice little bottle of spirits.

And that red logo on the dark green background?  Turns out it’s HUA for the H. Underberg-Albrecht company that Herbert Underberg started the day he married Katharina Albrecht to produce natural herb bitters.  

In addition to Get in the Spirit!, the puzzle, Steve also produced Get in the Spirit, the book.  The book provides a collection of fine cocktail recipes and wisdom.  Of course each recipe has a photo of the cocktail with an amazing garnish. 

It is also possible that Lee will make a companion cocktail shaker stand to hold both puzzle and book versions of Get in the Spirit!  Of course it will be a puzzle box and will utilize pieces from Get in the Spirit! in the solving process.  The CAD drawings look amazing and can be seen on Lee’s website, Pacific Puzzleworks.  However the fate of this project is still in flux as insufficient preorders didn’t provide the volume required for the originally projected price point.  Maybe offering an all 3D printed version of Get in the Spirit! for folks that don’t own one but would like the cocktail shaker stand could salvage the original plan.