# All Questions

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18 views

### Cube Connect Challenges

Cube Connect is a Flow-like mobile puzzle game on the surface of a cube. Rules of Flow (which is simply Numberlink with colors instead of numbers; copied from Nikoli rules with small modification): ...
37 views

### Cryptic Acrostic 1: Off Balance

This is an acrostic puzzle which uses cryptic clues. If you're unfamiliar with either or both of those, click the associated link. A complete answer should give the quote, author and source, as well ...
38 views

### Most efficient way for people along the edges of a grid to move to the center

I'm considering an $2k\times 2k$ square grid ($k\in\mathbb Z^+$) with $8k$ highly rational people standing along the vertices forming the perimeter. All of these people want to go to the centre of the ...
86 views

### Fold the plane four times to get the maximum number of cross points

You have a straight line $l$ in an infinite plane. You can fold the plane along any straight line so the line $l$ becomes two rays with a common starting point. In the picture we fold along line $a_1$...
851 views

### Escape across the floorboards

A mad lexophile sits alone in his apartment obsessively rearranging his Scrabble tiles and writing words on every available surface, even filling each floorboard with a word. The Scrabble tiles have ...
85 views

### Themed Boggle Grids

Inspired by this puzzle, I created (or discovered) these grids. Within each Boggle board is a set of words with a common theme. To make a word in Boggle, connect at least three letters horizontally, ...
96 views

### Consecutive integers which have digital sums that are not relatively prime

What are ten smallest natural numbers n, such that n and n+1 have digital sums which are not relatively prime?
233 views

### Math homework help

Thanks so much for helping me fix my grades in math, but I need your help again. I thought my homework would be easy. But then my teacher gave me some sample problems, and I don't understand them. ...
158 views

### A week around Europe

I've recently returned from a week of travelling around Europe, visiting a different town or city in a different country on each day, choosing my destinations according to an underlying pattern. I've ...
91 views

### A puzzling stained glass window

On a recent trip to Europe, I visited a beautiful gothic abbey. Walking up the dark aisle between old wooden pews, the air heavy with the odour of incense, I could only marvel at the beautiful stained ...
585 views

### Tipping a tetrahedron in a plane

A regular tetrahedron with one black and three white faces is positioned with its black face at the bottom of a plane. The tetrahedron is tipped several times over an edge and finally reaches the same ...
226k views

### What is the best method of scrambling a rubik's cube?

If I wanted to solve a physical Rubik's cube multiple times, for practice, what is the best, most random way, to scramble the solved cube? The best way I can think is to hold it behind my back and ...
628 views

### A maze, a statue, and a riddle

Hints at bottom John and Jeffrey had been friends for a long time. After meeting at Fort Bragg and serving in the military in the 60's, they had always remained close, even living in the same town ...
22k views

### Is it possible to scramble a Rubik's cube such that no two squares of the same color are touching?

My friend always insists on scrambling my Rubik's cube "perfectly" before giving it to me to solve. According to his definition, a "perfect" scramble must have no three of the same ...
865 views

### Prime Circuit Optimisation

It's logic gates time! You are only allowed to use NOT, OR, AND, XOR gates, accepting 1,2,2,2 inputs respectively. PART ONE You must build a circuit with $n$ inputs, and 1 output. The output must be ...
91 views

### Connection loss

hint: Find last word. bd be cd fh de HE fe lh pt mt bo* LE mk LA* pk ms PE* ve mt wd RG* * Changing things leads to the desired outcome. ...
123 views

### What are these words or phrases?

Given below are clues for 4 separate words or phrases. What are those? 1 Five letter word Having not intended 4 Go inside Leland No partial answers please.
72k views

### Simple 4x4x4 OLL parity algs?

I am learning to solve a 4x4x4 Rubik's cube and I think that the beginner OLL parity alg: (r U2 x r U2 r' U2 l U2 r' U2 r U2 r' U2 r') is a little too complex. ...
8k views

### Is twisting a corner of a Rubik's cube a valid move?

I believe the question is self-explanatory but I'm asking the question in different contexts. I understand that it makes the 3x3x3 unsolvable if you twist a single corner but there are cases where it ...
76 views

### steganography riddle [closed]

I have this image of Lena in BMP format, which consist a secret message: And I got this hint for this riddle: My initial thought was going over the image row by row and get the LSB of pixels in ...
1k views

432 views

### Double Chocolate: Happy Valentine's Day!

Hikouki (@flight_float) over on Twitter issued a challenge to make a Double Chocolate logic puzzle with a fixed grid pattern, and lots of logic puzzle makers responded to that challenge! Here's my ...
210 views

### Double Choco: I love myself

Rules of Double Choco: (copied from here) Divide the grid into regions by drawing along some of the dotted lines. Each region should have one group of gray cells and one group of white cells; both of ...
808 views

### Political Bantering Puzzle

Simply Puns Or Cryptic Clues In BOLD: Sitting atop a tall chair in the garden, one English Politician P was having his Evening Beverage, His American Neighbour N was asking "Our Admiral can write ...
15k views

### "EVARELTO" - What does this mean?

Can anyone tell me what this secret message is? EVARELTO Try finding the secret message represented by these letters.
2k views

### Solve this difficult rebus

There is a very difficult rebus. Try to solve this. The rebus is as follows: Hint-1: Hint-2:
424 views

### Spin the letter-squares!

Spin the letter-squares! A 5x3 grid of letters, e.g., a b c d e f g h i j k l m n o can be rearranged by spinning either the 3x3 section centered at the second letter of the second row (in this case ...
865 views

### How many "mathletic" couples were having dinner at the table?

Once, a number of couples, each one of them happening to be composed of a mathematician and an athlete (hence 'mathletic'), wanted, in order to diversify communication, to sit down at opposite sides ...
72 views

### What is happening tomorrow? [closed]

I posted this question on the Cross Validated stack exchange just now, but wanted to cross-post to here as well, because it is somewhat open-ended. A solution may be provided by myself or another ...
201 views

### IQ test question - squares, triangles, dots

I have this question from a friend. We have no idea where to start. What is the correct answer and reasoning? Source: "Ghid de pregătire pentru concursul de directori/ directori adjuncți din ...
2k views

### The Facebook (a double connect wall)

This is a double connect wall puzzle. The objective is to rearrange the sixteen people below in the 4x4 grid such that each row of 4 will be related by a common theme and each column of 4 will also ...
675 views

### Image steganography / hidden message inside image (png, 8-bit gray+alpha)

I'm new to steganography and have been trying to figure this one out but some additional help would be appreciated. There is this image here: It supposedly has a hidden message in it that should lead ...
249 views

### The Popup Annoyance

The story Fred, a software designer, woke up, got dressed, took a shower, ate breakfast, then headed off for work. He sat down on his chair and booted up his computer, only to see that all the files ...
640 views

### Lights in the Dungeon: Five by Five

This is the third in a series Lights in the Dungeon puzzles. previous (2nd) <-- | --> next (4th) You are practically skipping as you leave the four by four dungeon. This has been pretty easy so ...
934 views

### Peaceful Encampments

This math puzzle is due to Donald Knuth (as far as I know; maybe he got it from someone else) circa 2014. Consider a plain represented by the unit square. On this plain we want to “peacefully ...
3k views

### Word with the largest number of different phonetic vowel sounds

Which English word has the largest number of different unique phonetic vowel sounds in it? I will only count one vowel sound per syllable. To make it more like a competition, if two people get the ...
2k views

### One corner rotated in 4x4x4

I know that in a 3x3x3 this should never happen (unsolvable state), but is the same true in a 4x4x4? (the rest of the cube is solved) The following answer seems to say that everything about the ...
356 views

### 5x5 Rubiks Cube edge algorithm

I'm following the tutorial on Ruwix, and either they're making a mistake or I am. When solving the edges they give the image: This is my first attempt at a 5x5 and this step confused me for a long ...
402 views

### Peeled Rubik's Cube

Help! A [toddler / pet / washing machine] has peeled some of the stickers off my old off-brand Rubik's Cube. Can you still solve it and show me the result?
158 views

I want to make the pattern as shown in the images I get stuck at the last with two adjacent corners to be interchanged. How do I do this ?
115 views

### Rubiks 3x3 Cube Solution - an old method to relearn (3 corner rotation)

I am trying to relearn a method for solving the 3x3 Rubik’s cube that I was taught many years ago by a departed relative – it is for this reason that I want to relearn this method, eventhough it is ...
2k views

### Worst way to solve Rubik's in one algorithm

If you apply the same algorithm over and over again the cube will be solved. I want to know what algorithm is the worst one (the one with the longest cycle) I have found RU (cycle of 60 times) I have ...
559 views

### IPG v5 or Numerical IPG, What's The Difference? (GAN356X)

So I recently bought the GAN356X IPG v5 (stickerless) off of Amazon. When I went to the Gan website, there were two options for GAN356X: IPG v5 and Numerical IPG. On the Gan website it doesn't really ...
484 views

### How to get the final corners of a 4x4x4 in the correct position

I'm trying to solve a 4x4x4 rubiks cube. I've finished the middle and side pieces so I can solve it like a 3x3x3 but I'm stuck on the penultimate step - positioning the final corners. The instructions ...
245 views

### Rubik's cube from solved to specific pattern

Say I don't want to solve Rubik's cube but I want the reverse: I'm having a solved Rubik's cube (all stickers in it's right position and orientation) and I want to go from this state to a specific ...
476 views

### What are the specific algorithms Feliks Zemdegs uses to solve a 3x3x3 Rubik's cube?

I apologise if this is not the right site to post this kind of question, but out of all SE sites this one yielded the most question concerning specific cubing algorithms (namely this, this, this, this ...
122 views

### Randomly solving a rubik’s cube with only one face given

Given only one face of the rubik's cube, is there any way to form the other faces randomly so we end up with valid solvable configuration? Let’s suppose that I have an input which is only one face of ...
297 views

### Brute-force solver for Gear Octahedron - flawed method?

I am working on a program to brute-force a LanLan Gear Octahedron I bought second-hand (and scrambled). I have no background in "cubing" and just fancied solving the problem. The structure comprises ...