# Questions tagged [mechanical-puzzles]

Puzzles that are physically made and have some sort of mechanism for turning or moving them, such as Rubik's Cubes or trick boxes.

64 questions
243 views

### Anyone know of an impossible, trick puzzle? [closed]

My dad really likes mechanical puzzles and has drawers full of them to show to people. My family has decided that it would be a great joke to find a new one that he hasn't seen, that is actually ...
135 views

### Solution or name to this puzzle

I bought this puzzle at a local market and the vendor could not tell me, what kind of solution this has. Is the ring supposed to come off completely? And does anyone know the name / solution to this?
223 views

### How to solve wooden octagon box puzzle?

This is a puzzle with a hidden mechanism I have had for probably 20 years and recently found. The two halves of the box can not rotate. There is something inside that rattles and rolls around, perhaps ...
272 views

### Axis mirror cube has one centre piece rotated by 90 degrees

In front of me, I have a z axis cube. Sometimes when I scramble and attempt solve it, I end up with one of the centre pieces being rotated by 90 degrees. I know that in principle it is not possible ...
219 views

### Light Amplification by Stimulated Emission of Radiation

The following is a "Laser Maze." The goal is to place the tools into the maze so that when the power is turned up to maximum: The beam will split into two beams The beams (collectively) will ...
269 views

### Barrel - Part 5

An entry in Fortnightly Topic Challenge #35: Restricted Title 1. Title based on this xkcd. This is a continuation of Barrel - Part 1, Barrel - Part 2, Barrel - Part 3, and Barrel - Part 4, but this ...
276 views

### Barrel - Part 4

An entry in Fortnightly Topic Challenge #35: Restricted Title 1. Title based on this xkcd. This is a continuation of Barrel - Part 1, Barrel - Part 2, and Barrel - Part 3, but this puzzle is still ...
445 views

### Barrel - Part 2

An entry in Fortnightly Topic Challenge #35: Restricted Title 1. Title based on this xkcd. This is a continuation of Barrel - Part 1, but this puzzle is still self-contained. Continued in Barrel - ...
190 views

### Trying to build a sudoku related puzzle box, struggling to ensure that there's only one solution

I want to build a specific puzzle box. The physical side I have down, but I'm struggling with ensuring that there's only one valid solution. The box consists of 9 freely rotating bands, inscribed ...
750 views

### General strategies for solving metal disentanglement puzzles

(When I talk about metal disentanglement puzzles, I have in mind Hanayama and Tavern puzzles.) As opposed to twisty puzzles - which I can approach by playing with commutators and conjugates as a way ...
1k views

### Strategy for 2x3 Sliding Puzzle

Here's an instance of a $2$x$3$ sliding puzzle: The $2$x$3$ sliding puzzle is just a smaller version of the well-known 15 puzzle. Many guides exist on solving the 15 puzzle, and there are strategies ...
257 views

### Wooden Snake Puzzle - logic behind solution

I refer to the wooden snake puzzle in this post: Wooden Snake Puzzle I notice that there are 6 solutions to the 4x4x4 snake, which start respectively as follows: FRB… (↗→↙…, which is also the ...
918 views

### Old 6-piece wooden cross puzzle

I found this old puzzle and have no idea how to get it together. I have been trying to complete it for several hours now but to no avail. The pieces of the puzzle are as follows: Also sorry if it has ...
332 views

### Unsolved Ring Puzzle

I have not been able to solve this puzzle. I believe that the objective is to remove the larger circular ring, not the 2 smaller ones.
205 views

### It's a triple cross variation puzzle

I've been trying to solve this puzzle for a long time. When I got it, it was wrapped in plastic with no description on how to solve or what it's official name is. The only other description it had ...
743 views

### Wooden Snake Puzzle

I have a wooden snake puzzle in my collection that has been unsolved for years. I wondered if any of you might be interested. I have fiddled with it, but think it might need dynamic programming or ...
2k views

### Consecutive Towers of Hanoi

Consider the following variant of the Towers of Hanoi puzzle. There are six pegs. One of the pegs has a stack of $n$ differently sized disks, sorted by size so the smallest disk is at the top. All ...
441 views

### Puzzle Box: Spiral

Here are the views of a 11x11x11 puzzle box from all sides. The top face has a shallow hollow (about 1/2 a unit deep), with a spiral pattern printed inside of it. There is a black square on the ...
633 views

### Can two colors ever be orthogonally adjacent in a flexi puzzle?

A flexi puzzle is a fun little toy, consisting of wood blocks and a string that runs through it. The pattern of colors is repeated twice; if a color is found at position $N$, it is found a second ...
2k views

### Frequentists be damned! Design an evil coin to prove a point [closed]

The frequentists' definition of a "fair coin" is a coin that, tossed a million times, converges toward an equal number of heads and tails. But what is meant by converges? We might imagine a plot of ...
341 views

### A colorful wheel

Here's an interesting puzzle. This is called "Rudenko's Disk" (Brainwright) — finding information or solves for it online isn't all that challenging, which would largely ruin the fun here, so ...
477 views

### Is there a common way to solve tetris like cube puzzles

I have a cube puzzle similar to bedlam puzzle. It is 4x4x4 and has 12 pentacubes, 1 tetracube. Is there a simple way to solve them? I hope tags are correct :)
440 views

### Make a tetrahedral pyramid with these puzzle pieces.

Recently on a local fair (mela) I bought this puzzle from a magic-stall. It contains the following parts (each part is rigid, inflexible) Fig- 1 : Dismantled pieces in 1 set. It contains : ...
1k views

### What puzzles can I make out of origami?

I recently made and solved a soma cube puzzle out of origami. What other puzzles can I make out of origami?                &...
491 views

### How could a puzzle-based locking mechanism work? [closed]

I've sometimes seen boxes that feature a sliding puzzle or other mechanical puzzle on the lid which, when solved, opens the box. Advantages and applications mostly seem novelty and leisure, but I am ...
860 views

### Arrange coins on 3x3 table from vertical to horizontal

In 5 moves, rearrange the coins. From 1st picture to 2nd picture. Each move consists of rotate (right/left) 4 (in 2x2 grid) coins at one time.
2k views

### Reverse the order of 8 poisonous substances

8 very poisonous substances named s1 to s8 are kept in a safety room. The substances are kept in ascending order (s1,s2,s3,s4,s5,s6,s7 and s8). In the room there are 3 robots. First robot can "rotate ...
1k views

### Rubik's Chess Puzzle

This puzzle is part of the Fortnightly Topic Challenge - "Unconventional Tag Fusion". Last week I found out that Puzzle Prime Co. have invented new type of puzzle - Rubik's Chess. The goal is simple -...
1k views

### RIDDÅL - another unfinished flat-pack puzzle

This is an entry to the 19th Fortnightly topic challenge Yesterday I got a package in the mail. Attached to its top was a letter: Dear Alconja, That's strange, I thought... Must have gone to the ...
446 views

### Magnetic Rubik's cube

Forming a 2x2x1 puzzle block, four 1x1x1 Rubik's cubes were modified to attach with one another in many ways by means of magnets and steel discs. Assemble them first so that all sides are showing the ...
336 views

### Four flipped edges in the equator layer

Very often I get situation like this: I am interested in manual solving, so automatically generated solution is not useful (like with Kociemba algorithm). Currently I use twice the two edges flip (E ...
271 views

### halloween.zip file

I found an envelope in my mailbox today. It had some some weird looking symbol where the sender's address should have been, but I decided to open it anyway. We've been watching you. Since you ...
2k views

### Puzzle similar to 15-puzzle but more moveable pieces?

In the name of Science!™, I'm trying to look for (or, in the worst case, create) a puzzle/game similar to the n-puzzle whereby a player or player(s) have to put some pieces in a particular order (e.g. ...
1k views

### Need help solving 3d wooden cross puzzle

I'm trying to solve this puzzle and need some help with the solution: These are the pieces: The size is: 60mm x 40mm x 10mm. Any help appreciated. How do you solve this?
3k views

### A weird deleted Puzzling.SE question

So I was just browsing Puzzling as usual, when I stumbled upon a... to put it mildly, "strange" question: The question seems to be permanently deleted now... For those who disabled GIFs in their ...
440 views

### Is there some oil, grease, or substance I can find at home or in the garage or office to lubricate a speed cube?

I'm backpacking around Asia randomly so I won't be ordering anything online. But my speedcube has started to get a bit sticky and I'd like to lube it. So what are some easy to get alternatives to ...
1k views

### Four Triangles Five Shapes puzzle

I discovered here the Four Triangles Five Shapes puzzle (from Emrehan Halici). From the $4$ triangles, we can form: — $3$ different parallelograms — a square — an isoceles triangle The sizes and ...
4k views

### Does this metal puzzle have a solution (Baguenaudier)

When I was young I got this puzzle as a gift to me. The aim is to get the long piece out. I haven't yet found a solution, and I'm not sure if there is one Does this have a solution and if so ...
791 views

### Need help finding the solution for this Altekruse/Burr puzzle

I have a small wooden Burr/Altekruse puzzle comprised of 12 pieces. The pieces come in two shapes, as seen below. There are 8 of the lower left piece and 4 of the upper right piece. I can't remember ...
848 views

### Single solved state for Sudoku Pyraminx

(Not sure if this is the correct stackexchange, but I think it is.) I recently bought 10 QJ Pyraminxes with an ambitious idea for a mod in my head. After just the first step of modding I realized it ...
443 views

### what can we call this?

I have recently received this woody puzzle toy. What's its name ?
2k views

### How to solve this wood/string/ring puzzle

While on my mission in Argentina, I encountered this puzzle: I believe the goal is to somehow free the string so it only passes through the small hole in the side (at the right in this image; ...
721 views

### What is the equation to solve the puzzle box Super-CUBI 324 step

The Super-CUBI puzzle box takes 324 steps to open or close it, instructions. And uses a Trinary System. It must have a solution as it would be hard to remember all the steps to take to open it. But ...
22k views

### Solving Rubik's cube with one algorithm [duplicate]

I was wondering if it's possible to solve a Rubik's cube just iterating a single algorithm. It doesn't matter how complex the algorithm is (as long as it is less than 1 million moves), nor the time ...
244 views

### Calculate RPM ratio A to D? [closed]

According to the picture: cogwheels A and D have 60 jags each, cogwheel B has 40 jags, and cogwheel C has 20 jags. If cogwheel B turns at 20 RPM, calculate the ratio of A's speed in RPM to D's.
826 views

### Klotski Puzzle 1

Klotski is a sliding-blocks puzzle game very similar in nature to rush-hour/unblock me. In a given puzzle, a certain number of blocks labeled Z, A, B, C, .... are given. The goal is to move the Z ...
1k views

### Duplo train tracks

This weekend I was helping my three year old build some train tracks for his Duplo train. The train is powered by a small battery, so it moves on its own. His collection of pieces includes a bunch of ...
475 views

### What is God's Number for the Rubik's Picture Cube?

It's been well known for a few years now that every Rubik's Cube scramble can be solved in 20 moves. However, this is only for the case where the orientation of the centers is not taken into ...