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2
votes
0answers
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): ...
5
votes
1answer
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 ...
1
vote
1answer
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 ...
4
votes
2answers
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 $a_1$...
38
votes
1answer
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 ...
4
votes
1answer
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, ...
1
vote
2answers
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?
6
votes
1answer
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. ...
11
votes
1answer
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 ...
5
votes
0answers
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 ...
10
votes
2answers
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 ...
45
votes
4answers
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 ...
16
votes
3answers
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 ...
25
votes
8answers
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 ...
10
votes
4answers
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 ...
1
vote
0answers
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. ...
5
votes
1answer
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.
7
votes
4answers
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. ...
4
votes
1answer
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 ...
1
vote
0answers
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 ...
10
votes
1answer
1k views

What are you? Your fifth is in cookies but never in cream. -- a riddle

Your fifth is in cookies but never in cream. Your fourth is in stormclouds and also in steam. Your last's in your meaning but not in your word. Your second's in fourth, first, three-hundredth, and ...
14
votes
1answer
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 ...
9
votes
1answer
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 ...
4
votes
1answer
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 ...
7
votes
1answer
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.
13
votes
8answers
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:
6
votes
3answers
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 ...
8
votes
1answer
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 ...
-5
votes
0answers
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 ...
2
votes
0answers
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 ...
14
votes
3answers
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 ...
8
votes
1answer
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 ...
1
vote
0answers
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 ...
7
votes
1answer
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 ...
22
votes
1answer
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 ...
7
votes
10answers
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 ...
5
votes
3answers
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 ...
2
votes
1answer
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 ...
17
votes
2answers
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?
3
votes
2answers
158 views

Rubik's adjacent corners exchange

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 ?
2
votes
1answer
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 ...
11
votes
1answer
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 ...
4
votes
1answer
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 ...
2
votes
1answer
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 ...
2
votes
2answers
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 ...
3
votes
0answers
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 ...
1
vote
1answer
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 ...
5
votes
1answer
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 ...
1
vote
1answer
68 views

Flip edge in Equator layer but there is yellow in every edge in top layer

A way to solve this is to replace the flipped edge by a random block , but in my case all random block have yellow color, so if I swap than yellow will come in middle layer, which should not come ...
3
votes
1answer
325 views

Can I swap two "yellow" corners on the same side?

The bottom two layers are solved, and the cross has been formed on the bottom layer. I am putting the corners in, ready to orientate them correctly, but I have two corners which need swapping. (The ...

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