Extremely Puzzling - Goetz Schwandtner's Puzzles

On this page some extremely puzzling objects are displayed: My private puzzle collection consisting of a wide range of three-dimensional puzzles, from industrial produced Rubik's Cube like puzzles to my custom builds, from production range Pihilos wood puzzles to rare and special puzzles from various excellent craftsmen, and not to forget the Japanese Himitsu Bakos, including some equisite works of the Karakuri Creation Group. Please note that you won't find any jigsaw puzzles on these pages, may they be two or three dimensional.

Interlocking Puzzles

Burrs and other interlocking puzzles

Disentanglement Puzzles

Puzzles made of wire and/or threads

Puzzle Boxes

Karakuri, Himitsu Bako and other puzzle boxes

Sequential Discovery

Take aparts requiring several steps (sometimes involving builtin tools), usually to free a coin or other award

Puzzle Locks

Traditional and modern puzzle locks

Other Puzzles

Everything else, including puzzle games

Interlocking Explorer

Compendium of Chinese-Rings-Like Puzzles

News/Updates:

Added on 2019-02-15: Today a parcel with the latest release of beautiful wooden puzzles from Pelikanpuzzles arrived, and at the moment they are all still available in their shop and you can get some nice new puzzles there. The first one is Angelus, a puzzle from the category of two pieces in a frame. This may be a smaller example in this category, yet the two pieces still perform a nice dance before coming out of their frame. The Math is an addition (sic!) to the Addition puzzle by the same designer and craftsman, introducing some more mathematical symbols. It has a nice solution and you have to maneuver all three pieces carefully to get the first one out. Aracna is a 12 piece burr at first sight, with an additional piece hidden inside, so I put it into the Burr Zoo group page, with my experiences of solving that puzzle described on that page. This is an easier one of this category, and therefore it may be a good start if you want to have a look into the Burr Zoo category and proceed with a puzzle that is not incredibly difficult to solve!
Added on 2019-02-05: Today by coincidence two packages arrived at the same time. The first one contains some nice wooden puzzles built by Bernhard, and are some of the latest and greatest TIC puzzles (TIC=Turning Interlocking Cube). They are all designs by Andrew Crowell and have some rotations. The first one is GiganTIC, which was available in a different version from Brian Menold earlier, and on which I missed out. It has a high level of 10.10 and several rotations, and interesting moves. I have also found an alternate solution with only 7 moves for the first piece to separate, but that is probably due to the angled edges in this version. So this version has actually two different challenges! The PenTIC does not have that many moves, but one more rotation and some really interesting move sequences and moves. The PackTIC #2 came disassembled, and as an assembly challenge. I got it together after some time, and my solution has the same number of rotations and overall moves as advertised, so I am assuming I found the correct one. What puzzled me most is the last piece to come out/first piece to go back in, which is actually the most difficult one. For the assembly, you first have to solve the entanglement puzzle to get this (dark) piece into the frame, and then put in the other pieces with some more rotations and many more moves. Now I know why these TICs seem to be so famous at the moment, they are great puzzles and very interesting for 4x4x4 cubes.
The other package was a package from Knobelbox catching up on some older Hanayama puzzles, most of them just being two entangled pieces each, but that does not say anything about the difficulty rating: Cast S and S, Cast Hook, Cast Baroq, Cast Medal, and Cast H and H. The order also contained a trick lock: Push Trick Lock 5. This is a variation of a well known trick lock design.
Added on 2019-01-18: Today the latest puzzle from Australia arrived, and it is the second puzzle box in shape of a crocodile I have: Chubby Crocodile. It is a nice looking and very well made wooden crocodile and has even room for a belly containing a treat. The objective of this puzzle could therefore be described to open the box, or to find the treat included, and to make things better it also contains some sequential discovery elements. When you first touch the crocodile, it may be that it starts moving some of its legs, like it was trying to attack (or run away?), which is a nice surprise. This is of course one of the key elements, and overall the puzzle is fun to play with and not too complicated to solve. Definitely a great addition to the recent line of boxes Juno has been creating, and at the moment, there are even some left for sale on their Pluredro web site!
Added on 2019-01-08: The first puzzle delivery for this year came from my puzzle friend Diniar, with nice golden puzzles. They are not actually made from gold, but 3D printed, but with a nice golden look, and as usual they look better in reality than on the pictures I have taken. The theme for the first two is: puzzle box with sliding piece puzzles to be solved to open the box. The Crucibox has some two-layered pieces and then a whole lot of one layered square pieces. The first surprise you may see is that there is no visible hole to perform the first move, and this is not the only trick in this design. The shape of the cross piece is another, and then the box is also reconfigurable and comes with 30 challenges! The Treebox looks a bit like a Japanese puzzle box, due to the nicely printed tree on top of the sliding pieces. Those pieces actually have three different colors of material, demonstrating advances in 3D printing. You may wonder where the hole is to perform the first move of this sliding piece puzzle, and this is the first trick to be found. The second observation is made after moving some pieces around and seeing how the mechanism to open the box might work. This leads to another challenge to be solved before the box can be opened. The last one is a maze puzzle, with two circular mazes to be entangled into one cross-like structure: Mazy. The picture shows the puzzle already assembled, and during the assembly process it becomes obvious that this is a visible maze, where you can plan ahead instead of performing blind guesses. The pieces nicely interact with each other in a nice and new way, and especially with the golden color, I can imagine this to be produced in a cast metal version, maybe this is a good candidate for a future Hanayama Cast puzzle? All three puzzles are fun to play with (thank you, Diniar!) and at the moment there is actually one such design for offer on Puzzle Paradise.
Update on 2019-01-07: Names of the Karakuri x-mas presents added.
Added on 2018-12-28: Yesterday there was a small private puzzle meeting at a friend's place and I even got two puzzles there. First, I acquired the Printable Interlocking Puzzle 4, which is strange to see in wood, as the name tells that the pieces of this one can be 3D printed without the need for a support structure. Dirk presented me his IPP38 Exchange puzzle, the TRIROD, nicely implemented and close to the original prototype. This one had been designed by late Markus Goetz many years ago and much later in the early 2000s, the prototype with the hand written instructions made an appearance at IPPs, and the basic principle later showed up in other designs by other designers. This route finding puzzle is a nice one to remember a great puzzle designer and puzzle friend.
Today, the Karakuri Christmas presents showed up at the local customs office for import. As usual, I don't know the names for most of them, to be added later on. The first one is Silent Cat and a nice little cat figurine in the typical style for this designer. Not too difficult, but some funny steps. The X-mas present 1 is a drawer, like last year, but this time it does not open immediately, as the last one did (with the secret still hidden). The next one is X-mas present 2 and has some trees on it. These trees were used by the designer in several puzzles in the past, and they always gave a very specific hint for the solution. Based on this, I have a vague idea, what may happen here, too! The X-mas present 3 looks like a caged 6 piece burr, but it is actually a box, and behaves like one. I have only found some steps so far, but they are typically for the designer, and I am looking forward to finding many more steps before the box opens!
Added on 2018-12-27: Yesterday I had a Christmas visit by some good friends, and one of them also brought a puzzle as a present: Stadtpuzzle Muenster-Rathaus. He had been in the German city Münster and there this puzzle was offered showing the architectural features of the city hall (hence the German name of the puzzle). It has only around 40 pieces, but all of them having the same colour and only different shapes (many of them!), it is not a very easy puzzle. One fascinating aspect is that the picture on the manufacturer's web site is different from the actual frame shape, so I will be completely on my own when solving it. Luckily, the wood grain helps a bit, and I already managed to match the first few pieces. Thanks for the nice challenge!
Added on 2018-12-20: Only a week after their release, some of the latest puzzles from Eric Fuller arrived, and this time, the usual extra high precision was not only visible on the puzzles, but Eric also included a card stating this, and some instructions on the puzzles. Instructions how to store and keep them, not how to solve them! The first one has an unusual look and is a three piece burr, as the name suggests: Just 3. The other two come from a designer with a name well known from the IPP Design Competitions over the last years: Hajime Katsumoto. The Burr with Rings looks like a caged six piece burr, but is actually similar to Stephan Baumegger's "Frame Me Up" burr, where six of the 18 pieces have a ring attached. Here, all pieces have a ring each, and the wood is really beautiful (maybe not on my picture)! The last one is another variant of Soma in Case, and there are several other puzzles where you have to pack the Soma pieces into a cage, and I also have one of them. However, this adds a special element: The box has a lid to be closed and that lid has an extra cubie attached, on the inside! We have seen the success of the great 5L Box in this year's IPP Design Competition, and this Soma based puzzle employs this element, too. Something tells me this will be a real challenge for the holiday season.
Added on 2018-12-10: Today a small delivery containing two cute little sequential discovery puzzles, both with the objective to free the coin (Some more coins from the Philippines!): Rizal was the first one, that started the series and maybe a smaller one in the series. Several steps are required to get the coin out and it seems I still need to work on the solution for the first steps. The Kusing 25 is possibly the largest one, and definitely the newest one in the series available so far. Looks like there is a lot more going on, and I have already found a piece that wants to come out and there seem to be some other parts of the puzzle where it fits in nicely. Not yet solved, but very interesting! These puzzles are fun and high quality puzzles for a small price tag and form factor, and they are a recommendation, all four of the series.
Added on 2018-12-05: Today a package arrived with puzzles following two themes: They are all nicely crafted from beautiful woods by Pelikanpuzzles, and they are all about some interlocking pieces dancing in a frame. Addition has six plus signs, one on each side, and after the pieces dance through the frame for a while, one of them comes out — with the others in their original positions! Tom Pouce looks like a block strapped by two wooden rings, but actually there are two central pieces, leading to a total of four. The first piece to come out has interesting moves, some of them not easy to find, but the second pieces seems to be stuck in the puzzle forever, until one finds a clever move sequence to get it out. The next two puzzles are by the same designer and follow some of his recent schemes: Triad has some letter shaped pieces, in this case three letters L are visible in the assembled state. Like for the other puzzles, the pieces perform some strange dance before the first one is finally removed. Even though it sometimes looks like a rotational move may be possible there does not seem to be any intended or unintended rotation. The final puzzle of this package, Wing Hangar, has the lowest number of pieces: Two identical pieces and a cage. I wrote "and" because the puzzle came in disassembled state and for the picture I had to find a solution to assemble it. Even at the level of 20 moves it has, it is still possible to assemble the puzzle from scratch without help. Luckily the stick pieces are identical and both the pieces and the frame are symmetrical, limiting the number of possible assemblies.
Added on 2018-11-28: At the customs office I picked up another new six piece burr coming from Australia, or at least so it seems. The puzzle definitely looks like the standard six piece burr, and like a bigger of them. After disassembling it, there are indeed six pieces. However, there are different aspects that are more interesting: Some people might call it a puzzle box (with just a little cavity inside), but for me the sequential discovery aspect is the strongest for the Sequential Discovery Burred Box, so I am putting it into that category, and this may also help some of the non-box-puzzle collectors out there (correct, Kevin?). The sequential discovery solution of this puzzle box (sic!) is not very difficult, but extremely well designed and makes good use of the overall six parts of the puzzle. In fact, several of the sequential discovery steps will require that you combine two of the tools to perform the step. Whithout saying too much about the solution, there is also a nice sequence of steps where you use one of the tools to extract an other tool and then combine both in one of the next steps to progress. Another fascinating property of the solution is that there is a point where several steps can be carried out, both using the tools, but only one order or performing these steps will lead to success. What may be the best distinction to a puzzle box is the visibility of clues and mechanism parts that enable you to solve the puzzle without any blind guessing at all. A very clever design and unfortunately, it seems that it has sold out already.
Added on 2018-11-24: The Hanayama Cast Puzzle series, now coming in the "Huzzle" brand offers great designs in a nice and sturdy metal implementation at a very good price. The latest of the series is not yet available in Europe, but fortunately, it can be ordered in some other parts of the world already: the Cast Hourglass. The designer is well known for some other Cast puzzles and also IPP Design Competition entries in the past. From the picture, it should be obvious where the name comes from, and like several other puzzles from the series, it consists of four metal pieces which need to be disentangled and re-entrangled afterwards. The difficulty rating is at the top of Hanayama's scale with six stars and from what I have heard from others, this rating seems to be justified.
Added on 2018-11-16: Like yesterday a parcel with something special arrived. This time, it was not an exquisite beautiful small puzzle box, but a big set to construct many fascinating puzzles: The Barcode Burr Master Set Upgrade. This one extends the recently arrived Barcode Burr with an additional cubic burr with a different set of (blue) inserts already mounted, so that the result is a binary coordinate motion version of the puzzle. I have already solved this one, and it is a very interesting combination of concepts: a binary sequence and coordinate motion. In some way it reminded me of the Confetto Box 2 by Hiroshi Iwahara, but then the sequence is quite different. After understanding the sequence for removing the first piece, finding which piece would come out second and after which sequence was an additional challenge. For the third piece, the sequence was now obvious and to my surprise, the last three pieces came apart like in the original binary Barcode Burr. The other inserts offer various other assemblies of higher level, some of them following a ternary or quaternary sequence, others having more irregular sequences. To avoid spoling the puzzle set for others, I will not explain more about the set, but more details about the contents (and an additional picture) can be found in the compendium entry. This also includes a good amount of high quality paperwork, a great set, and a very good deal for the price! A great addition to compendium and n-ary puzzle group (do you notice something unusual there?), and it will take some time until I will have built all the configurations and solved them.
Added on 2018-11-15: From Jesse Born I received a parcel with a small puzzle box in it, just slightly bigger than a typical smart phone: Saifu Puzzlebox. This is a beautiful and well crafted box and comes in different materials to choose from. When ordering this box, one could choose between different woods for the various pieces of the box, and between Yosegi and brass for the sliders, and if I understood correctly, all of the boxwes have been different so far. The sliders are the first interesting thing to note: They seem to be locked into their respective grooves without having any visible link to the mechanism below. However, they behave like they are in fact interacting with this mechanism, and each of them seems to be behaving a bit differently. I wonder how this all relates to the solution and I am eager to find that out.
Added on 2018-11-11: Today I went to a regional puzzle gathering to meet some good puzzle friends and to play with some new (or even newer) puzzles. Of course, there were also some puzzles for my collection. The main theme of today's update is IPP puzzles, and there are some puzzles with the same name like some I already have, but in fact different puzzles. The first handful of puzzles are actually some designs which showed up in the IPP38 Design Competition. From Dr. Volker Latussek, I received a Cubemaker, the 2018 version with four angled pieces. Last year, I had already played with a 3D printed prototype and found some solutions for the different challenges. This wooden version features some of the harder challenges, and the goal is to build a stable figure out of the four pieces, in which eight of the darker piece parts meet to form four dark cubes. There seems to be one more straightforward solution, and a creative one, and I am looking forward to finding both of them. The next one has a spectacular name: Rollercoaster. Only three pieces to be packed into the box completely, easy? It is not allowed to put your fingers inside the box, and maybe that is for a good reason, as I have been told that some of the moves required actually resemble rollercoaster like movements. The transparent box helps you to see what is going on inside and also to quickly detect when something is going wrong and there may be a rollercoaster accident in the box. The next is one of those simple puzzles where you only have to pack 5 L shaped pieces into a box and close the lid, hence the name 5L Box. As you can see from the picture, there is one of the pieces outside the box, and after inserting it into the available space in the box, I could not close the lid for some reason. On a second glance, I noticed why this was the case and now I am beginning to understand why the puzzle won a first prize in the competition. The Pack 012 is another one of those easy "just pack three pieces into that box" puzzles. The opening seems to be wider than just for one of the cubies, but I have the bad feeling it may still be way too small for a straightforward approach. The name of the designer and the prize in the competition make me reconsider and may not be an easy puzzle after all! From the name, the next one is a recycling puzzle that can be created from some leftover square sticks, yet not enough to form a complete cube. Hence the name: Leftovers. This was no spontaneous build, as this was also an entry into the competition at IPP38, and after playing with it a bit, I am slightly worried that I might have put it into the wrong category. The next few puzzles are for catching up on past IPP Exchange puzzles: The Tangled Dovetail is definitely in the Disentanglement Puzzles category (like the one before?), or isn't it? Trying to solve it, it looks like there might be a tiny little bit more to it than just disentangling the usual knot and then sliding the dovetail halves apart. The MIKSLOK is one of the rare trick locks in the Exchange (until very recently, that is!). I haven't seen one for a while, and upon first inspection it seems to be a regular lock that has been doctored with, as some people would say. Of course it does not open by simply inserting the key and turning it. The next one is a key by name, the Hysteresis Key. I already have the simpler production range version, but this seems to be a lot more interesting. Some longer dead ends to run into than in the other version. This puzzle also has a maze with more dimensions than at first look. You can move the key in one dimension, but it is actually a 2D maze. Very recently, I have received another puzzle with such a dimension jump: A box with two sliders, yet a 3D maze. Can you spot which it was, and guess how the third dimension was implemented? Big Wheel is another such case of a seemingly 1D maze which is more complicated at a second glance. The wheel will rotate forwards and backwards until it hits some obstructions, and then there is also another kind of wheel movement required to progress in the 2D maze. For solving this, you may need to remember that sometimes not only dentists should examine the teeth!
And now for something completely different: Non-IPP puzzles. The GELO 1234 is one of those numbered designs, and with just three pieces in a frame it is not overly difficult, but reassembly from scratch may be a bit more challenging. The Printable Interlocking Puzzle 4 made out of wood is a curiosity, as Richard has specifically designed it to be easily printable on a standard 3D printer without the need of support structures. Still it is a nice puzzle in wood and has some nice move sequences. Why, why, why, oh why does the next puzzle have the name "YyYy", you might ask? Having a look at the pieces, this will become clear, as they are clearly Y shaped. It is the second puzzle of this designer in this update, and one may have expected more like just level 13.3 with linear moves, like some fancy rotations. Starting to play with it, this puzzle will demonstrate some nice and usual move sequences, and level 13.3 for such simple pieces is actually quite high. The last puzzle is from a designer I have not heard of before, but searching for his name, I came accross an ACM paper about "Recursive Interlocking Puzzles" which I had read some years ago. The puzzle is a cube related to this article: Singapore 5x5x5. Not one of those fancy animal shapes, yet an interesting demonstration of the concept.
Added on 2018-11-06: Today I received the first coins from the Philippines I have. They are embedded into some nice small puzzles made from laser cut acrylic sheets held together by some screws, which both have an excellent size for storage in the display cases or even the pocket when bringing them somewhere. The first one is the Aguinaldo, which is a hidden maze puzzle, with a maze to be solved before the coin can be released. However, Rex has added a nice additional trick to it, in shape of an additional piece that takes part in the solution at some point in time. The Barasoain is a sequentially discovery puzzle, where you have to find and unlock some tool to progress in the solution. When that tool is found, it is quite obvious where it may help (It looks like a key!), but that is not all you need for solving the puzzle. There is an additional trick before the coin is released. An interesting observation is that the key actually solves as one of the locks in the beginning, a clever idea! Two nicely designed and nicely made puzzles, which are fun to solve and not too difficult. They are not the first ones to be released in this series, so let's see what Rex comes up with next. It is great to see such interesting mechanisms packed into this cute form factor!
Added on 2018-10-29: Today's package brought two nicely made wooden puzzles from Australia, and one being the completion of the trump card series puzzle boxes: Spade Case. This box looks like the Club Case, but the mechanism works quite differently and in a new way, in fact: I have never seen this kind of trick. I would be giving to much away of the solution by mentioning details, but it is notable that this mechanism has more dimensions (in a mathematical sense) than you would expect, and at some point in the middle of the solution, you can actually see more of the mechanism. If you have not yet formed any theory how to solve the puzzle, that is the right moment during solving. This one may be the most box-like of the case series, having the biggest storage compartment of all four. The Grooved 6 Board Burr #1 looks like a nicely made 6 Board Burr, but it additionally features some bamboo dovels and some grooves, increasing the level to a very high 22. Playing with it a bit, I immediately noticed that this grooved version behaves quite differently from the standard version, featuring configurations in which a piece would simply drop off in the corresponding standard 6BB. Not in this grooved design, of course! Clearly, this has been the result of Juno playing with the router again, and I am curious to see which other creative puzzle ideas will come out of this in the future!
Added on 2018-10-24: Yesterday I went to the biggest board and card game fair in Essen, and as usual I visited some puzzle friends to look for new puzzles. At the Constantin booth, there were some brand new vesions of known n-ary puzzels: Voidlock Metal is a heavy and nicely made full metal version of the voidlock, and Steuerrad-Kiste* (Steering wheel box) uses the puzzle as a lid. You have to solve the puzzle on the lid (or at least most of it) and then you can unlock the lid, which uses a simple, but clever mechanism. Two nice additions for compendium and n-ary puzzle group! The Two Side Sliding Lock* is a sliding piece puzzle in the shape of a lock, which uses pieces that can move in one way only. Some only horizontally, others only vertically, guided by grooves in the front and back side of the puzzle. A confusing and unique puzzle idea! There were also two items offered which were designed by Katsumoto, who is well known since IPP36: Spiral Square is a puzzle consisting of 4 identical parts to be taken apart (without opening the screws, of course!) and putting it back together, which proves to be the greater challenge. The Framed Jigsaw has a name and look that would immediately disqualify it from being shown on this site (please look at the introduction above!), but this one is not a true jigsaw puzzle, more like a combination of complicated packing, interlocking, and sliding piece puzzle. There is only a small opening in the top in the middle, where everything has to enter the puzzle, and obviously the task is to put all the pieces into the frame. Looking at the piece left over and the space remaining in the frame, the question immediately pops up, how this could be done, as the piece does not even fit into this gap. Well, some clever re-arranging of the pieces already inside might help. Rombol is also on my usual list for the fair in Essen, and they had some nice puzzles to offer. Kardan is a serially interlocking puzzle. The next two are designs by Dr. Volker Latussek, who appeared successfully in recent IPP Design Competitions (for example with the overwhelming success of his Casino puzzle this year, and the Marble's Cage a bit earlier): Six-T-Puzzle and SOMA Pack have the goal to pack everything into the box. Six T pieces (not 60), five of which are already inside, and then the whole Soma cube piece set for the other puzzle. Of course this is not achieved by simply creating a packing outside the box and then putting it in one by one, but the small openings will require a bit more to solve. The last visit was to Hendrik's Puzzle Shop, who is a good contact for the latest Cast puzzles and exotic twisty puzzles. He had the Cast Arrows for offer and then a variety of other nice puzzles. Molecube mini is actually shown in the solved state and is a cute mini version. The next three are serially interlocking with the same piece layout and solution, however the different puzzle shapes and symmetries make them vary in difficulty: Small interlocking cube*, Small rounded interlocking cube*, and Small interlocking barrel*. From the same unknown manufacturer was the Time Machine Variant*, and then there were small and tiny variants of the known Magic puzzle: Mini Magic Heart* and Micro Magic Skeleton*, which reminds me a bit of the Lucasarts Adventure "Monkey Island 2: Le Chuck's Revenge" with the groups of bones. The last one is actually a 1x2x3 and simple twisty puzzle, but also some decoration for the x-mas season to come: Zcube Christmas Tree
While creating this update, one of the latest works from the Karakuri creation group arrived: Visible 5-Ary Drawer (Quinary). As one may guess from the title, this is clearly part of compendium and n-ary puzzle group and fun to solve, with a smooth mechanism. Unlike many other Karakuri boxes, the n-ary mechanism of this box is in plain sight beneath an acrylic cover, allowing to follow what happens easily. This is actually the 200th entry in the compendium, and there are even more puzzles in it if you count all the variants!
Added on 2018-10-24: When you are busy, time is flying by, and so I did not yet expect the arrival of some of the latest works by Eric Fuller ordered last week. They are beautifully made as usual, and unusual in their designs: Okto Cube by Yavuz is a six piece board burr in a cube, easy enough. However, the cube is assembled from eight identical pieces (hence the name) and comes apart. A clever idea! When solving the puzzle and moving the boards around, after several moves, two of the cubies will drop off the puzzle, so you have to be careful when solving, or you are in for a surprise! The Pin Block Case first showed up at IPP37 and quickly afterwards it was available in the signature series, and now re-released in the artisan series. Four identical pieces with a pin and groove each, to be packed in a box through its opening, how hard can that be? Not very hard, but a clever design by Hajime Katsumoto, an expert and IPP prize winner for his packing puzzles, and fun to solve! While packing into the box, the pieces interlock in a nice way, which is why I put it into the interlocking category.
Added on 2018-10-15: Last weekend, the biggest European puzzler's meeting took place in Voorburg again, the Dutch Cube Day (DCD), and I attended to meet many puzzle friends from all over the world and also to add some puzzles to my collection. It was a great event, as every time! Right at the beginning, each participant received two presents from the organizers: Double Dutch as a welcome gift, and then a small version of the Utopian Cube, as a present to remember the late Markus Goetz. Alfons was there with a lot of beautiful wooden interlocking puzzles, some of them being: Greyhound, Long Skirt, Lolly Box (the original one, which I did not have in my collection so far), Four in a Box (a much more complicated variant of the same concept), the Moira's Cube (one of the cubes, this one being named after a cat), Madia, Missing Link, and a few of the Happiness Cube series which are older designs, but have been quite popular lately: Happiness Cube 169, Happiness Cube 95.2, and Happiness Cube 20.2 (which I have in a tiny 3D printed version, too!). Jack had some older designs newly made and looking beautiful: Sixticks (thanks for this one) and Crossing. That last one has been on my compendium web site for some time, but I never had one of these fascinating sliding piece puzzles. It is an n-ary sliding piece puzzle without a long control piece, which all earlier designs had, for example also the next one is also one: a vintage SpinOut mini in a version I have never seen before. Both puzzles are on the n-ary puzzle group now. This one and the vintage Gamma puzzle were offered from my late puzzle friend Laurie's collection. The next two puzzles are brand new designs, one of them taking part in the IPP38 Exchange: Gyrotwisty (do you remember the Gyro Twister toy, looking similar and promising to strengthen your wrists?) and the African Mask, which has two layers of sliding pieces, with the top layer being round, arc shaped pieces. The Curly Cube is a nice design which was around for some time and which I finally picked up, and it looks just beautiful and comes apart in an unexpected way. The Two Piece Cube is one of the rare puzzles by the German puzzle designer Carsten Elsäßer, which I had seen a couple of time and was now for offer — no need to think twice here! Maybe I will have to think more than twice when solving the puzzle, as I have already found some interesting first steps and interactions with outside and inside parts of the puzzles, but nowhere near a solution. The Turtle's Heart and the Kowloon Seal Luban Lock are some IPP Exchange puzzles from earlier years and this year.
Added on 2018-10-01: Before picking up the puzzles for this update, I revisited two rotational interlocking puzzles again: The Shield and Square Target. A puzzle friend mentioned that his solution works differently than what I had described, and indeed for The Shield, I found a solution to get the first two pieces out without rotations, and then the other two pieces requiring some rotations. With rotational puzzles, it seems to become more difficult to find the "best" solution, as one cannot simply take the one from Burr-Tools or a similar program. The puzzles arriving today are also in the interlocking category and also not in the standard Burr-Tools category. One of them is an addition to n-ary puzzle group and compendium, and both of them are 3D printed versions of IPP Design Competition Entries (this year and in the past). The first one is a nice coordinate motion cube extending Ray Stanton's Slideways series: Slideways Cube (printed). Three identical pieces with some angled cuts make it ideal for 3D printing. The other one is the one with the many moves and has more 3D printed pieces, the Barcode Burr (printed). It moves nicely and after quickly finding the right triangles to push, the sequence starts flowing and soon afterwards the first piece is released. Disassembling the cube completely, unveils that each piece is created from three 3D printed pieces and some screws. Printing each piece in three parts seems to have several advantages: Much easier to print and less support structure (if any) required, and the long bars can be printed having a smooth surface. This technique makes the puzzle very nice to play with, and then the n-ary sequence can be found during playing, confirming what is summarized in the corresponding compendium entry. Two very nice and high quality 3D printed puzzles, and also quite inexpensive. So if you ever wanted to get (a version) of the Barcode Burr, now is the chance!
Other/Older updates:: Can be found on the update history page

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Hints: If you need solution hints to any puzzle in my gallery, feel free to e-mail me. My e-mail address can be found on my homepage.