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 (standard) 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 Apart

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 2021-04-10: Meanwhile, I was able to solve (most of) the The Tippenary Mystery Tour and it is a superb puzzle that goes on and on and on. I have seen all the pieces of the box and enough to create a compendium entry for it, but there is still an additional challenge I need to solve, and believe me: That is a difficult one! I tried to avoid spoilers in the compendium entry, to keep the surprise for everyone. This is a great puzzle and very well made, after having a lot of fun with it already, I am still up for that extra challenge.
Added on 2021-04-09: After the parcel with some nice n-ary wooden puzzlebox, today there is already another one of those, which is a big surprise. It arrived from Jack Krijnen, who had built his Jack-in-the-Box, which fell into several categories, being a box, a riddle solving puzzle, an assembly challenge at the end, and being part of the compendium and n-ary puzzle group. Today the successor of this nice box arrived, and it is not the first time I saw it. At DCD 2019, Jack showed me a prototype and demonstrated some steps (which did not help me this time, as I did not remember the solution part). I played with the box a bit and then went onto Jack's mailing list, and now here it is: The Tippenary Mystery Tour. According to the description, it has sequential discovery components, riddle solving, and in the end an additional challenge. So far, I have played with it a bit, but not progessed much so far, so all the details for compendium and group page will be added later. The outside of the box looks similar with the nice contrast between panels and edges, and I am looking forward to solve this box. What I am expecting is that this will come apart into at least three stages, with the lid on top and a big box in the bottom, and I already had some fun solving the first puzzle and I am now looking at the next challenge, and this looks more complicated to me, and very well made.
Added on 2021-04-08: After the new nice heavy metal puzzles in last update most of which I have solved (the Sticky Barrel is still sticky), today a parcel from Sweden arrived, which is a very rare occasion. Recently, Fredrik Stridsman implemented the n-ary design "ReTern Key with Circular Pieces" into a new puzzle box, and I was happy to hear of this and bought one for myself, and a parcel with this box quickly arrived today. With the box came a surprise puzzle, and additionally the box was not empty but contained another surprise puzzle, which I could unwrap after opening the box. Thanks a lot for these nice puzzles! So today's update will feature not one, but two new puzzles / variants for the compendium and n-ary puzzle group. The first one is the beautifully made box, consisting of a nice wooden box and a transparent lid, which is the actual ReTern Key based puzzle, but it needs to be solved slightly different: N-Airy Box. If you would like to know more about the difference to the ReTern Key with Circular Pieces, you may have a look at the compendium entry, but be warned that this may contain some slight spoilers. The second puzzle is actually a bigger version. Not bigger than the box, but the physical size smaller, so that it also fits into the box: ReTern Key with Circular Pieces (Coin Release). This is the actual puzzle that box is based on, but featuring more pieces and a longer solution sequence. And then there is a coin to be freed, which comes out after the leftmost special piece has been slid all the way up. Also this puzzle got its own compendium entry. The third one is something completely different. A nice pocket sized, 3D printed puzzle: Stack-A-Maze #1. As the name suggests, the blue pieces interact in some form of stacked mazes und the goal is to remove these blue pieces from the frame. I haven't progressed very far with this one, because I was busy playing with those ternary sequences. Great puzzles, and they are fun to play with and with nicely sliding pieces.
Added on 2021-04-03: Today a parcel from the UK arrived, and it is one effect of the Brexit that it took much longer than before and added some import taxes. Inside the parcel, there were three nice wooden boxes, and inside those neatly packed and presented three hand made metal puzzles. They look beautiful, better than in the pictures I have taken, and feel very solid and valuable. The first one is a bolts and nuts puzzle where the nuts have to come off the bolt without any external tools allowed: Nuts. This is the one I have solved already and while not too difficult, I like it very much, and the build quality is excellent. With the other two, I have played a bit and have gotten nowhere with them so far: Spinning Tumblers is a stack of tumblers that has to be taken apart, and all of them (including the ends) seem to spin freely, and that would not make it easy to get a good grip on them to get them off. The Sticky Barrel looks a bit like a miniature butter churn. The stick can spin and slide, but it will not come out — and extracting the stick is actually the goal of this puzzle. After all the wooden and 3D printed puzzles, I have now some more beautiful heavy metal puzzles for my collection and I am looking forward to solving them.
Added on 2021-04-02: Yesterday early eveing, a puzzle package with some new puzzles for Easter arrived, thank you! The first one is an expansion of the Whirling Wheelies puzzle, and there are many quite different expansion sets now, very versatile concept: Traces. This puzzle/extension is a combination of several concepts including some deduction, and comes with a set of interesting challenges. The other are more sliding maze puzzles in the classic sense, but with a twist: Sliding Maze includes a layer with a maze restricting the movement of the sliding blocks and an additional slider which makes solving the puzzle (re-ordering the number sequence to ascending) possible. The third one is: Just Six Pieces which uses little cut-outs in the pieces, a concept which I have always liked when it showed up in sliding piece puzzles. After all the packing puzzles, I now have some nice puzzles to slide pieces around.
Added on 2021-04-01: Some time end of last year, MINE was offering to build some new puzzles, and while I am not an expert on packing puzzles, ordered some of them, and in the second half of February a parcel arrived with some brand new puzzles — but we were requested not to post any pictures some while so that everybody could enjoy their own surprise. The first two are 3D packing puzzles, and the first one is a successor of an award winning puzzle: 5L Basket, it is the first one I solved and it was a nice and not too difficult challenge, and somewhat different from the 4L Basket. The Chiral 2 + 2 contains 4 pieces to be packed into the box. The rest are 2D tray packing puzzles, many of them with different challenges via a two sided frame with different shape. Some of them have all pieces the same, others have all different pieces, and none of them seem trivial: 5 Mononoke, Five Fennec Foxes, 6 Ayakashi, Z1*8, and Z2*5a. It seems that near miss solutions are quite easy to achieve, but that does not solve the puzzles. For the 5 Mononoke, I created such a near-miss solution, and only a bit later realized it was quickly turned into a solution for the puzzle. I like how this one turns your expectations against you to keep you away from the solution. However, when you know this, the solution comes much closer already. All these are beautifully made puzzles and good for some puzzling entertainment.
Added on 2021-03-30: In my latest puzzle package, there was an additional surprise bonus puzzle included, thank you! It is from a well known designer: Outback. I have managed to get the four big pieces into the frame, but that small block should also go inside as well and that is an open challenge for me.
Added on 2021-03-29: Last year, I bought a 3D printed take apart puzzle from Turtle3D, but the puzzle related to this name is one I did not get. I hesitated because I don't like electricity and electronics in mechanical puzzles, and I also missed out several releases, but it was a puzzle that was highly recommended by some puzzle friends of mine, so I just had to get it: Turtle Trip. Yes, it is 3D printed again, and magnetic (no magnetic plastic!) and it is heavy. There is a lot going on inside it, and I have only started trying to solve it when my eyes lit up — or rather something in the puzzle lit up with a friendly green glow. That is assuring to continue with the trip! This puzzle looks beautiful with many nice details and feels very well made, and I am not only looking forward to sending Turtle on his trip, but also finding the party pants for him to wear, which is the goal of this puzzle. This puzzle has a good size, too! I have been moving around some puzzles in my display cabinets lately and there is just the right space for this one now, like in a big packing puzzle.
Added on 2021-03-27: From the latest Pelikan release, some very beautiful wooden puzzles arrived today. The first two are packing puzzles, the third one is a mixture of packing puzzle and interlocking puzzle, and the last two are high level interlocking puzzles. This update starts with AKKU, which is another word for rechargeable battery in German, and that may be related to putting 9V of current into that box. To be more precise, 9V (or L) shaped pieces, all identical. Knowing Volker Latussek's puzzles, I know not to underestimate this simple sounding challenge! The next one is a multi challenge packing puzzle from Alexander Magyarics, where you can extract the pieces and then set the sliders for the challenge you want to solve: Sliders. I think this one will keep me busy for a long time! His Pepper Castor is usuing an unusual triangular grid instead of the usual cubic one, and it looks fascinating, reminding me of a pepper shaker (hence the name!). The last two are from Christoph Lohe, who focused on interlocking puzzles with 3 pieces in a cubic frame for a while. There were some very interesting designs, but on some of them, we found rotational shortcuts — making these puzzles even more interesting! Now he has teamed up with Andrew Crowell, a master of TICs, to use rotational moves intentional, and out came two puzzles: Chamburr and Cyburr. Andrew seems to like names that sound like ordinary words a bit mispelled, and this time we have puzzle names sounding like chamber and cyber, and not sure how this relates to the actual puzzles. All look beautiful and very interesting!
Added on 2021-03-24: After having solved the nice burr puzzle from yesterday, two parcels with more or less cubic puzzles arrived, from Japan and from the US: Cast Dice is the latest puzzle in the Hanayama Cast series, soon to be released in Europe as well. It looks a bit like a boardgame die, but without the pips on it, but in reality it is a metal frame with three identical pieces inside. It is very easy to get them out of the frame, but getting them in seems to be a different story. When two are inside, they don't want to let the third one go into its position — fascinating! The other is a 3D printed cube with some metal and magnet parts inside: Bolt Action. A first bolt is immediately visible and can be screwed out easily, and then it should be used as a tool elsewhere, and there is another bolt visible in the puzzle that needs to be freed as well. The goal is to free a 3D printed coin, and this seems to be a change following some regulations, as the earlier versions had a small US coin inside, and the second cube of this release was for the US only (probably because the weight and/or material of that coin plays some role in the solution). There seems to be a lot going on in this cute puzzle, and the manufacturer name suggests that the puzzles are 3D printed and during this process additional components added so that you cannot see them from the outside later on. A fascinating approach and application of 3D printing, should that be the case. Two cute and interesting puzzles of completely different kind.
Added on 2021-03-23: From the latest Pluredro release, from Australia, this new puzzle has landed here: Floating Framed Burr. It is a framed burr from a specialist on this kind of puzzle, and it is basically a frame with 4 sticks inside. Those sticks have each been extended at one end, so that there is an internal gap between each pair of pieces. When playing with the puzzle, you will immediately notice that there are several different moves possible, and it continues this way, and even at the moderate level of 16, this is a very interesting puzzle, and a very well crafted and beautiful one, too! Once the first few pieces are sticking out a bit, others are freed to move around in the frame, and you get the "floating" effect which is mentioned in the description. Then it seems that some pieces should come out easily, but they are in fact still locked into the frame. A fun puzzle to play with!
Added on 2021-03-20: Today marks the completion of a puzzle project I have been working on in the last weeks. From a kit, I built the Mecanigma puzzle box. The kit was made available in a crowdfunding campaign last year and arrived end of last year, a few months earlier than the planned delivery, and it is a very well designed kit. Still, many tools are required and it takes a lot of time to paint and wax the boards, extract the pieces (which are from laser cut plywood and 3D printed ones), assemble some modules and then finally assemble the whole box. The box is not extremely challenging to solve, but features some nicely designed mechanisms and is still a fun challenge. Each of the six sides features a different puzzle, which interacts with some of the other sides, and some of them need to be visited more than once during the solution. No blind guessing is required for solving this box, and there is also a combination lock, but that has a combination which can be deduced. A great puzzle box with a beautiful steampunk look, which is both fun to build and to solve. There are some kits available for pre-order on the manufacturer's web site, and right now there is a Kickstarter campaign running for the next box, a bigger and more complicated one. This campaign also includes a Mecanigma Kit for a better price than in their shop. A very interesting puzzle box, and I am looking forward to the next one!
Added on 2021-03-17: After some converations with puzzle friends, I was interested in a certain crazy shape shifting twisty puzzle, and from Now Store it arrived today: 4+4 Corners Cube. This one has 16 axes where you can rotate pieces, all corner turning. Some of them are single options per corner, in some other cases, there are slightly offset turns possible, with 3 different ones around a corner, and these are more face turning, around pieces close to the corner. I started scrambling the puzzle and also tried some shapechanging moves, but it soon became apparent that this is not a speed cubing puzzle at all and some of the turns need to be performed with extra care to prevent popping. This puzzle has many pieces, and many small ones among them.
Added on 2021-03-13: The invention of widely available 3D printing enables more and more puzzle designers to create their new puzzle designs and offer them for sale. One of these designs immediately caught my eye, as I spotted some variation on the Panex theme: Stacker. First I thought that it is yet another puzzle where you have to move a stack of ball bearings of different sizes from one compartment to another compartment, with the movements limited by the size of the ball bearings and the compartment layout. After some playing and solving attempt, it seems to be exactly that and you can start with the Tower of Hanoi approach to solve the puzzle. However, note that the middle compartment is much shorter than the outer ones, and that will add another layer of difficulty when trying to move the smallest of the ball bearings from one outer compartment to the other. A fascinating design, and also something to be added to my compendium and n-ary puzzle group. A well made puzzle that is nice to play with showing the positive effect of 3D printing on puzzle designing.
Added on 2021-03-12: Recently, I received a new Escape Room in a Box and had a lot of fun with it, and just a few days later, I discovered that there is another vendor releasing the second box as well. After IDvendure now Escapewelt.de released their second box, after the nice pyramid shaped one as their first one: Space Box. This is readily built from laser cut plywood and not only do I see many clues on the faces of the box, but also things that may be keys, keyholes and other mechanisms. Those cute puzzles are a lot of fun, and they seem to be a typical German thing. Aside from the massive Codex Silenda, they others I have are all from German manufacturers and this particular one is a new side-business by an Escape Room company, to compensate for lock down related lack of escape room events. The clues I found on the Space Box are mostly numerical, but also some symbols (like planet symbols) and letters. There is a clue starting with "QED" which is what in mathematics is used to conclude a proof. So should this be the end of the solution already? I believe not! I am curious to see what is inside and will use some quiet time to have my own escape room (in a box) event this weekend.
Added on 2021-03-10: Theo and Symen have been busy designing recently, and they publish their puzzles so that they can be 3D printed to try yourself. After some packing puzzles in the past, they started looking into dovetail joints. This also lead to them designing a puzzle box: Banded Box. Of course, some of the solution is spoiled as you only have a pile of pieces and no box to open, but then it is a nice assembly challenge. The other one has the name of a box (in Dutch, a box for sewing utilities), but is actually a packing puzzle: Naaidoos. I managed to get 2 of the 3 pieces inside already, and this already required some trickery. You cannot even slide a single piece in and then close the lid, but some rotational moves are required for this stage already, and it is good to have those holes to see what is happening and to navigate the pieces with your fingers. I still have one of the previous puzzles by them unsolved, and this may be the next one taking me a long time. Fascinating!
Added on 2021-03-05: Today two cute twisty puzzles arrived from Russia, and both are a bit older designs already, but have only become available recently. The first one is Screw 2x2x2, which is a 2x2x2 in two axes, and has a screw mechanism for the third axis, where you can screw the top and bottom layer away from the center to some extent, leading to some shape shifting together with the other moves. I played with this puzzle in the past, when I was visiting Oskar some years ago. At that occasion, I picked up this interesting twisty puzzle, which was lying on the table unsolved. To both my surprise and Oskar's surprise, I managed to solve it. But then I could not reproduce the solution, so it should be a new solve now. The second one, is a 2D twisty puzzle: Krystian's Square. The four triangular pieces can be slid along the two diagonal axes, and when properly aligned, the round pieces can be rotated in circles. There are just a few possible configurations possible, making it a very easy puzzle, but a nice one. Both puzzles are very well made and fun to play with.
Added on 2021-03-02: Some years ago, my puzzle friend Christoph Lohe designed some burr puzzles shaped as padlocks, and I have several of them as wooden versions created by several craftsmen. Recently, 3D printing made it possible to print some of these locks, basically based upon the Burr-Tools file, and then enhanced via the PuzzleCad library, and published on the Printable Puzzle Project page. Both of the locks do not use the key in a way you would expect from a padlock, but in a strange fashion. The first one is: Key Trap. This one has the key attached to the shackle, so that it can move up and down by one unit, and then some other moves are enabled. The white central pieces perform a nice dance and when leaving the puzzle they are not in the same relative arrangement compared to the assembled state. After a while into the solution (for disassembly) the key is free to rotate up on the shackle, and will then be linked with the shackle, while the rest can be solved independently. Not too easy, but still a good challenge and nice puzzle. The other one has another use for the key: Misused Key, where the key is stuck in the top of the lock body and held in place by the shackle around it. While this puzzle was designed some years ago, it only recently became apparent that there is a rotational shortcut: After 7 certain moves, the key can be rotated out, but then the rest of the puzzle still needs to be solved. Unfortunately, it is no sequential discovery burr puzzle, which would have been a very fun thing: Just think about such a puzzle where you need to extract the key within 7 moves, and then arrange the other pieces in a certain way, so that a key hole is opened and the key needs to be inserted and rotated to progress. Well, not in this cute lock, but why stop dreaming? ^{*) Actually there is a well known puzzle box I don't have, but was able to solve in the past, which works exactly that way. Fascinating!} In the current model, with the extracted key, the next piece does not need the full 26 moves of the level, but maybe only half of them — again with some fancy dancing around of the four pieces. Still a nice puzzle to play with.
Added on 2021-02-19: Dovetail puzzles do not need to be cubic to work, but can also have other shapes. One of these is: Dovetail Mix Crossknot, and it is a nice one. This one is built around a central cube, which could also be replaced by an equally sized puzzle box, and then some pieces around. These come in different tetromino shapes with some dovetail joint parts. The overall puzzle is quite stable in the assembled state, and only two of the pieces can come out at the beginning. One of them does not free anything more, the other will unlock more pieces after removing. The word "Mix" in the name suggests that there may be other such puzzles possible, using only one of those shapes, and indeed the desinger already seems to have some of those, yet unpublished.
Added on 2021-02-18: In a very recent auction I won some US copper coins, which came in plastic boxes. I guess the main point here is that these are 3D printed puzzles, each of them with a coin inside that has to be taken out (and back again). Cop Out 1, Cop Out 2, and Cop Out 3. They are cute and I have already started playing with number one, and these puzzles feel well made and it is also not trivial to get the coin out. I am looking forward to see what one has to do before the coin exists through the slot and the first steps hint that this could be some hidden mazes for the coins which are interacting with the grey levers.
Added on 2021-02-17: Recently, we have seen some 3D puzzles with dovetail joints — which is actually something that has been around for other materials of puzzles for a long time. Today's additional also features dovetail connections, but in three different species: Dovetail Cube. Some of these dovetail shapes will fit into others, but then there are also incompatible ones. This makes assembling the 27 cubies into a big cube more challenging, but on the other hand gives you some hint what may need to be joined together. In my view, this puzzle shows nicely how 3D printing can enable additional features. Not sure if those different dovetail shapes would have been possible in traditional woodworking.
Added on 2021-02-09: This update features another IPP28 Exchange puzzle, and this time a nicely 3D printed one (as a reproduction of the original): Fire. Two pieces come separate and need to be joined in one move, similar to some puzzles created by Scott Elliot. This is clearly a puzzle that benefits from 3D printing, and in my view creating such a puzzle as a working model from wood would be very challenging. A fun puzzle to play with!
Added on 2021-02-07: Today's update shows two beautifully 3D printed trick boxes: Bamboo Box and Crane Box. For both boxes, you cannot see from the outside how the mechanism works, but both boxes can be opened, and in quite a different way. The Bamboo box features a new locking mechanism that requires several steps to open, and rattles a lot, so there is a lot going on inside. The Crane Box features a classic mechanism and also some red herrings making the solution a bit more challenging. They are both well designed, fun to solve and have the right size to play with them! I am curious to see what comes next in this category!
Added on 2021-02-06: A parcel from Hong Kong Nowstore brought another nice Oskar puzzle today: Jumble Prism. The geometry of the puzzle with the arrangement of cuts was invented by Bram and Oskar made it into a 3D puzzle which was then mass produced by mf8. There are not many triangular prism twisty puzzles, and this is a confusing one, as the cuts are running diagonally, not parallel to the sides. A crazy shape shifter! With it came a puzzle which is an extension of some I already have: 3x3x17 This one is a fully functional, and also shape shifting, as you may conclude from the number of pieces in each direction. Basically, a 3x3x3 turned into a 9x9x9 (which is elsewhere in my collection already), and then extended by some additional layers on top and bottom in a symmetric fashion. Nothing new added to the solution compared to the 3x3x9, just a lot more pieces to put into the correct spot. This is an effect that many of the big record twisties show, but the 17 layers remind me of Oskar's 17x17x17 Guinnes world record twisty puzzle (at that time) I could play with at IPP31 a bit.
Added on 2021-02-05: Recently I received two very nice exchange puzzles from a puzzle friend, thanks a lot! These are both created by Peter Knoppers and designed by Oskar van Deventer (and Peter): Feed the Cat is a cat shaped puzzle with a gear that either starts in the mouth of the cat, or outside the puzzle, and you have to get it to the other of those two positions. It sounds simple, but taking a closer look, this is an intricate maze puzzle. The gear can rotate within the geared inner part of the frame, and is also kept in place by those gears, and then it can also change between the various layers of the puzzle, each with a different geared border. The Coin Maze is more obviously a maze puzzle, where you can see a pin on both sides of the top of the frame, and a maze on each side of the coin. Goal is again to get the coin out/in. However, it is not that easy, as there is a third dimension coming in, when the coin can move to the front or back wall a little, multiplying the maze by three layers. For both puzzles, you can see everything, but in my view both of them offer some puzzling challenge for friends of mazes, and they are very well made, too!
Added on 2021-02-04: From the last games fair in Essen that took place before the pandemic, I brought a new puzzle box with me, which is an escape room in a box. Last year a Kickstarter campaingn was run successfully to produce the successor of this box, the second ClueBox, and it arrived today: ClueBox Davy Jones' Locker. While the box has approximately the same size like the first one, this time the goal is not to open the box to release a Schroedinger's cat, but to open the box to see if Jones really locked away the souls of sailors who lost their lives at sea. Spooky! I am sure there is nothing to be afraid of when solving this box, and I have already seen some interesting new elements that look quite different from the first ClueBox. The solving time estimate is a bit longer this time, and this may mean that there are more or more difficult puzzles and riddles involved. Something to look forward to! As for the first one, this box comes in a very nice packaging and at a good price.
Added on 2021-02-03: Today a nice 3D printed puzzle is added, or two puzzles rather: Dovetail Bi-Cube. The name comes from the pieces being held together by some dovetail joints, and all pieces (except for one) consist each of two cubies linked together. There is also a light version and this can be built by exchanging some pieces with the additional 6 pieces coming with the puzzle, and that leads to a second puzzle challenge. Taking the puzzle apart is quick and easy, and re-assembly of both cubes is the real puzzle here. It is nice to see some more applications of the dovetail joints that re-appeared recently, and because of the availability of 3D printers. While they are also possible to make in wood, it is much easier to make them as a 3D print.
Added on 2021-02-01: Today's puzzle is the result and reward of a puzzle hunt. Recently, a puzzle friend offered some very rare puzzles for sale. Confirming I was interested was the quickest part, and the transaction with the puzzle friend was also easy, but then a puzzle hunt started, carefully arranged by the companies PostNL (in the Netherlands) and Hermes (Germany). They wanted to ensure that also receiving this puzzle would be a puzzle in itself. At the beginning PostNL tampered with their address scanners, so that my name would be removed from the address entry in their system. My puzzle friend had created a printed address label with nice 6mm high letters, easy to read even from some distance, and maybe they were too big and clear for the scanners, or they thought it to be too easy? Well, not the first time they make things more interesting this way. When the parcel arrived in my hometown, the real puzzle hunt started lasting one full week. In a handful of phone calls to their service desk and various e-mails I had to give them some hints on where that mysterious parcel would have to go (without looking at the clearly visible address by my friend on the top of the parcel). Each time, my hint was later each day answered by another puzzle in the tracking system, so that another set of hints could follow the next day. Finally, I managed to give them a good hint and after playing this puzzle hunt game, I could finally pick up the parcel from a helpful parcel shop where it had landed. It was fascinating to see one side of the parcel being covered with a stack of more and more address labels with many variations of my address, while on the other side of the parcel the pristine address label by my friend was showing the right way all the time. Even though I succeeded with this puzzle hunt and won my "prize", I would prefer not to be included into such activities in the future, please. Let's go for mechanical puzzle solving instead. You may ask what all this was about? Well, here it is:
Schluessel (Key) is a Roger Puzzle by the mysterious German puzzle designer Roger D. While it is only a key by name, the main part is that (b)lock with the key hole. As usual, key and keyhole are delivered separeted, so you can put the key into the key hole, then turn clockwise, just to find out that the key would stop just short of the full rotation. Well, then maybe it was wrong to put the key in and turn that way? Let's turn it back and take it out! Of course, this is a mean puzzle and the key will not turn at all any more, and is perfectly stuck in that nearly fully rotated position. Getting it out is actually the main objective of the puzzle. Not wanting to spoil anything here, I am just mentioning that the puzzle is even meaner than described so far. After playing with it a bit, I managed to get the key out, and without force, but with what seems to be the intended solution. I managed to do this several times already and still have no good idea how the innards of this cute puzzle look like. So probably this is the real challenge: Make up a consistent theory on how that mechanism actually looks like and works. A fascinating puzzle, and quite different from the other Roger puzzle I already have, and it was definitely worth the "puzzle hunt".
Added on 2021-01-29: Recently it seems I have been into packing puzzles, and here is another one: A surprise from a puzzle friend — thank you very much. It is: Dictionary Case. This one won an award in a Japanese puzzle competition and comes in a well crafted presentation. There are 5 boards in 2 different sizes, and those have to be packed into the box completely. The box allows to stack two boards behind each other, but will not allow for a third one, and taking rough measurements of the board makes it clear that two layers may not be enough for everything. Instead of ignoring / removing one of the boards, I went for the Think^TM approach and within a few minutes, I had all the boards inside the box. Now it looks like that the original description of the objective brings it down to the point: The box has exactly the right dimensions to contain this arrangement of the pieces. A nicely presented puzzle, and a fun and not very difficult puzzle to solve.
Added on 2021-01-28: On the Printable Puzzle Project web site there are some very nice puzzles of various kinds that can be downloaded electronically and then 3D printed on the usual 3D printers. This update features three nice restricted packing puzzles, where you just have to fit the pieces into the box so that they do not stick out through the opening. The first one is by Yavuz and has six wide L shaped pieces: Manneken. This puzzle does not require rotations and the nice solution can be found by logic reasoning, and is not too difficult. The other two are closely related: L-I-Vator I and L-I-Vator II, like a series. They both have an interesting feature relating to their pieces. Each of them have six pieces with 2 voxels size for the smallest one up to 7 voxels for the largest one. If that was not enough, the piece each piece with n voxels can be created from the next smaller piece with n—1 voxels by adding one voxel, so the shapes form a series of snapshots of a piece growing from 2 to 7 voxels. Both L-I-Vator puzzles have the same box shape and this property of their pieces and both require some rotations in the box, but then the piece shapes make them completely different packing puzzles to solve. This also shows in the difficulty I experienced: While I could solve the first one within less than half an hour, the second one took me longer, maybe the double amount of time. These are three nice packing puzzles, even for people who do not favour packing puzzles.
Added on 2021-01-15: From the Puzzle Artists a parcel arrived after travelling over a long distance in the past month. In it, two new puzzles for the twisty octahedra group: Hybrid Octahedron is a hybrid between a Face Turning Octahedron (actually the Master version) and a Tip Turning Octahedron. So that the puzzle remains stable, not all cutting planes can be used for all kinds of moves, but the faces (top layer) can be rotated like in an FTO, and the two layered tips can be rotated. It is a fascinating and well-made puzzle and even after a few moves, it gets confusing. The other one is easier to solve: Coin Octahedron. Like the Coin Cube, this one has the coins in the centre of the faces which can rotate freely, and has rotating tips. This should be easier to solve, and I have already scrambled it to solve it later on. The pieces of this puzzle have been 3D printed, but then The Puzzle Artists have taken extra care to finish them adding a really nice feel of this puzzle. With these puzzles, another novelty came in the parcel, in a special version: Gear Star is a new puzzle, in a two coloured version appearing in the 2020 Puzzle Advent Calendar on YouTube. It has two layers in grey and yellow, and each layer has a cetral pentagon and five star tips, so that the layers can be rotated against each other around the centre (and nicely aligned with magnets!), and the star tips can be rotated between the layers. Then there is a special pentagonal knob in the middle that adds another layer of complexity with an additional mechanism. Beneath it is a central gear mechanism with three green and two red gears, and this influences how the adjacent tips can rotate: Those next to a red part cannot rotate at all, and those next to a green gear part all rotate at the same time. I like this rotation of three adjacent tips, and then also the central pentagonal button will rotate. This is a clever design, and with the simple colour scheme I should be able to solve it. On their web site, they have a regular version which features 5 colours, and I am expecting this to be much more complicated. Thank you, Puzzle Artists for this nice novelty!
Added on 2021-01-13: This update is about two nice 3D printed puzzles: No Holes Barred is a restricted packing puzzle, where 5 nearly identical pieces need to be packed into a cubic box. The pieces are the same, except for one which has lost half a cubie, and half a cubie is now attached to the opening of the box. But that was not how this puzzle was built! This puzzle comes from the "Printable Puzzle Project", which can be found on the WWW. The next one may be a mixture of puzzle, sculpture and implementation of some building technique: Kawai Tsugite Cube. It consists of 8 pieces and can be pulled apart into two halves — if you know how. These pieces are locked together with Kawai Tsugite joints, which is a Japanese wood joining technique. No wonder the resulting puzzle is quite stable and difficult to take apart! Of course, once taken apart, trying to determine the arrangement of the pieces to get it back together again is a bit more challenging! If you are looking for the joinery technique, there are many details to be found on the WWW.
Added on 2021-01-11: Today a nice anti-slide packing puzzle arrived: LIST. Thank you Michael for "putting me on your list"! The puzzle is nicely made from acrylic sheets and looking at the picture, it is quite obvious why it is called LIST. The puzzle comes with a black inlay that allows you to store the pieces without having them rattling around. Now try the same without the black inlay — that is the objective of the puzzle. Finding an anti-slide solution for these four letters is not too difficult and some logical observation helps here, and actually there are multiple solutions. At first when trying to build an anti-slide solution, one of the letters was not very cooperative and always moved around, but there is a second challenge: Build an anti-slide solution that does not contain all of the letters. Having solved these challenges, I noticed that I could use that 3-letter anti-slide solution, add the fourth letter to it and immediately have another anti-slide solution again. Who would have thought that so much is going on in this puzzle!
Added on 2021-01-07: This year puzzles are coming in earlier than expected. Today, a package from Australia, coming in directly, not crossing the International Date Line. In it, three beautiful and complicated wooden puzzles: Juno's Arrow is a sliding block puzzle with a dark arrow pointing to the top left and the goal to slide the pieces to form a light arrow pointing bottom right. However, it is not that easy because this is a restricted move sliding piece puzzle, where the pieces have grooves and pins in a seemimgly random fashion. I already managed to mix the pieces and with some difficulty to return them to the original configuration, giving me a preview of what is to come. The next two puzzles look like ordinary six piece burrs, but they are a bit different, while still having six pieces, which are crooked and going through the burr diagonally. The first one came disassembled and within maybe half an hour I managed to assemble the six pieces using two halves of 3+3 pieces sliding together: Crooked 6 Piece Burr Original Version. There seem to be other assemblies sliding groups of 4+2 pieces together. There is also a more difficult version featuring pins and mazes: Crooked 6 Piece Burr Pinned Version. This one came assembled and it is not trivial to take apart, but also not too difficult. When the pieces came apart, I immediately saw that it will not be an easy task to put back together, requiring a decent amount of dexterity. There is a base to help to put up partial assemblies in a more stable fashion, but it's probably still a good challenge. Hopefully I will manage this one day. Three beautiful, very well crafted, fun, and challenging puzzles indeed!
Added on 2021-01-06: Another day, another new Constantin puzzle. Because of the stock availability, the previous one was ordered from Puzzle Shop, and this one then from Knobelbox: Chess Box. It is a beautiful wooden box with metal chess pieces sitting on top. Obviously, these pieces will need to slide in a certain way and while they look the same, some of them behave differently. Not an overly difficult puzzle, but definitely fun to solve!
Added on 2021-01-05: The first update of this year brings some heavy metal: Super Lock is over 1.6kg of brass, with beautifully etched details on both sides. It has some knobs with small rings to rotate and no less than 4 key holes. All of these will rotate a bit, but not much, and probably it will take some time to figure out the correct steps to solve this puzzle and open the lock. I wonder if the design of the key should scare puzzlers away or be a warning not to try to open the lock. In any case, this is the first such key I have seen on any lock.
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.