Unanswered Questions
354 questions with no answers
32
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0
answers
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Noita Eye Glyphs
A puzzle found hidden between the background layers of the computer game Noita. The puzzle has not been solved since it was added to the game in October of 2020.
It is made of thousands of eye images, ...
- 6,862
27
votes
0
answers
2k
views
Is there a move-efficient way to rotate the center pieces on the Octo-Star?
I'm looking for a more efficient algorithm to rotate the center column of the Octo-Star puzzle 45 degrees.
The situation below occurs when four properly-oriented edges are next to each other, ...
- 53
25
votes
0
answers
2k
views
Decrypting the Key: "Phage is Spreading.."
I've been trying to solve this puzzle called "Phage is Spreading.."
...
- 10.4k
22
votes
0
answers
3k
views
What does this mathematical operator do?
The solution to this puzzle is one I came up with when working on this puzzle: What is the answer of this math puzzle?
For two natural numbers a,b, can you figure ...
- 640
22
votes
0
answers
2k
views
REALLY important days in history
@Z. Dailey asks a mathematical puzzle Important days in history... and to come! with a series of dates in years 1973, 1978, 1983, 1992, 2005.
My puzzle asks the question: What is the previous date in ...
- 197
19
votes
0
answers
971
views
Alternate, complex potions puzzle from HP fanfic
A long narrow room. The entrance is blocked by purple flame, the path onward blocked by black flame. On a table, the only thing in the room, are two dozen potions in opaque bottles. Half green glass, ...
- 191
18
votes
0
answers
708
views
Determining the meaning of a challenge coin
I saw this rather cool looking challenge coin the other day, and I was wondering what the associated binary on the back of it means, as it isn't standard ASCII.
In plaintext:
...
- 10.4k
14
votes
0
answers
650
views
Qubes: Oh, For the Love Of
TL;DR: This is a mixture between a tribute/spin-off puzzle and an attempt at a new puzzle type, greatly inspired by the notorious arcade game, Q*bert, published originally by Gottlieb Amusement Games. ...
- 793
14
votes
0
answers
2k
views
Crack the pigeon code
Can you crack this message? It was discovered in a chimney in 2012 attached to a carrier pigeon and was most likely sent during the D-day invasions. The GCHQ was not able to crack it, even after ...
14
votes
0
answers
833
views
Grandma's keynote
Found this note which is addressed
To my grandma, in her chest
Since she's passed now, here's my quest..
What tickled her interest?
And who invited her as guest?
- 123
14
votes
0
answers
1k
views
12
votes
0
answers
440
views
Can we find four identically colored numbers?
Take the positive integers {1, 2, 3, ...} and color them red, green or blue. Is it true that no matter what coloring is chosen, we can always find three distinct numbers x, y and z so that x, y, z ...
- 16.1k
12
votes
0
answers
257
views
The Snake and the Hunter
The Snake and the Hunter is a game for two players who play in two rounds interchanging the roles of snake and hunter. The game is played in a rectangular grid of points, say 6×6. In both rounds the ...
- 19.3k
12
votes
0
answers
892
views
Dissecting a figure into 2, 3, 4, and 5 parts but not 6
This figure is divided in 2, 3 and 4 equal parts of same size and shape, but it is not possible to do it in 5 equal parts of same size and shape.
Is it possible to find a figure that can be divided ...
- 886
12
votes
0
answers
1k
views
Hidden message in rap text II: "Ya, a ray 'ave july joy!"
This puzzle is inspired by this one by @LukasRotter. Hopefully you don't mind me using similar (well, basically the same) format as yours, Mr. Rotter! ;)
The same rapper released another teaser for ...
- 336
12
votes
0
answers
606
views
Found the key, but what to unlock?
Here's a series of text messages between me and my friend.
Me: Couldn't use ebg13, so used ______ to hide my messages.
Him: What? How is this possible???
Me: A big prime ______, what else did you ...
- 748
12
votes
0
answers
475
views
Quantum tic tac toe strategy
Most of us learn tic tac toe early in our life. Also, it is easy to find an optimal strategy for playing.
How about Quantum tic tac toe? What is the optimal strategy for playing it?
Rules
On a ...
- 16.3k
12
votes
0
answers
746
views
Meteor strikes again
Part of a phone call:
-...well why didn't you just say so?
-It wasn't as easy as you thought, Jack. All the power lines here were destro---
-I know...It's not like we're living on a different planet ...
- 501
11
votes
0
answers
338
views
Can you find the cipher that I used?
I have encoded a phrase, using a cipher that I invented. But I don't want you to decode it, rather I want you to figure out how my cipher works.
This is the phrase that I encrypted
Find the ...
- 161
11
votes
0
answers
337
views
The Majestic but Draconian Dinner
We are hosting a dinner party. Here is a list of things you can take:
Hotdog
Grapefruit
Oreos
Potato Salad
Cheetos
Utensils
Katlyn
Predator Drones
Banana
However,...
- 147k
11
votes
0
answers
328
views
An Attempt at AV Puzzle
Here's another puzzle with visuals and sound. I hope you enjoy it!
With Sound:
https://youtu.be/yHkQdEu0QpA
Static Image (the musical notes represent the music in the YouTube video):
Hint 1
Hint 2
- 812
11
votes
0
answers
404
views
What is a Freecell Word™?
This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.
If a word conforms to a special rule, I call it a Freecell Word™.
Use the ...
- 10.3k
11
votes
0
answers
517
views
April Fool's Enigma
Every year, a famous French youtuber (e-penser) presents his enigma of April Fool, but this year, targeting specifically a group of people who have done particularly well last year, he raised the ...
- 817
10
votes
0
answers
706
views
A funny looking cipher puzzle
What secrets does this jester hold? Hints are found down the road.
A hint, or rather, that what is held transcribed:
- 101
10
votes
0
answers
509
views
I'm a number with a special product, so name me when you think you've got it
In the blocks that come before,
their special product tells us more.
To guess my scheme you'll need calculation,
but only little tests of recreation.
Each block contains atoms strong as Thor,
...
- 2,296
10
votes
0
answers
2k
views
3D ring/rope wooden puzzle solution?
I have a Eureka 3d "Puzzle G":*
The box lists 3 puzzles:
Remove the ring
Remove the rope
Move the ring to the other side
While I was able to solve shows the first puzzle, I haven't ...
- 406
9
votes
0
answers
306
views
Dreamcatcher Puzzle
I created this puzzle as part of a set of puzzles about good wishes for a wedding. Does it work?
- 252
9
votes
0
answers
669
views
A nice riley, hopefully is fun
Within these lines is a puzzle I've made.
With cunning and wit, can you guess my trade?
Inside the tome of the element's power,
One minute per side, you'll read for an hour.
A single number of the ...
- 19.4k
9
votes
0
answers
352
views
12:41 puzzle: colorful geometry
The answer is a 4-letter word. I will not be giving any hints.
This puzzle is very old. The puzzle is solved using only the image (no clues to the puzzle in title or description).
CommunityBot
- 1
9
votes
0
answers
358
views
A Glutton and a Split Check
N, T, A, B are arbitrary constants in this problem. I have only definitively solved the N=1 subproblem, so, if the general problem cannot be solved, I will be satisfied to mark as accepted a solution ...
- 2,389
9
votes
0
answers
288
views
Rolling dice in a box
A box containing identical dice that were arranged to have same orientation has a missing die at the center (see figure). The dice moves to the free space for they can change orientation and ...
- 6,656
9
votes
0
answers
690
views
Signatures of serial killer Edward Wayne Edwards?
This is from a real-life murder-mystery. In 2009 Edward Wayne Edwards was arrested and convicted of five murders, following a tip-off from his daughter April. Former detective John A. Cameron ...
- 1
9
votes
0
answers
475
views
The highest poem
I am three, often a person, always a digit, and also witout.
George POUST was his name.
Manufactured by Ford between 1972 and 1976.
YMCA was not my first team in my coaching career.
Theory of ...
- 10.3k
9
votes
0
answers
289
views
Zed's Order: Breakfast at Elon's
My friend Elon and I constantly irritate each other. He recently built himself a rather respectable restaurant – a sort of bed-&-breakfast, minus the beds. Last week, he asked if I could ...
- 793
9
votes
0
answers
488
views
What causes these signs to follow this relation?
Can you find why does the below relation hold true?
Hint 1
Hint 2
- 3,943
9
votes
0
answers
368
views
My drunken formula?
I know that today is an important day, but I can't remember why... All I have in my possession is this formula I wrote last night in my drunken stupor:
You go here:
$$B = 25 + \biggl(\frac{O}{...
- 10.6k
8
votes
0
answers
450
views
Cookie Unionization
My Christmas cookies are gone! When I came into the kitchen this morning, the box was empty. All that remained were a few crumbs and this note:
We absconded.
You never saw that coming, did you? Well, ...
- 400
8
votes
0
answers
277
views
Doubling the cube with rational Meccano strips
In three monographs published in 2006, 2008 and 2014 Gerard 't Hooft considered "Meccano mathematics": how to construct specified distances and regular polygons by a rigid system of ideal ...
- 7,820
8
votes
0
answers
621
views
Connect The Wall-Words:
We have a group of 16 words here:
ACIDITY
TIME
MICROSCOPE
MARKS
LIGHT
SCALE
CHEMISTRY
CLAW
REAL
LEAD
INTEREST
BIOLOGY
DUCK
RADICAL
ACADEMY
LEAF
Goal: Group these $16$ words into $4$ groups, each ...
- 53
8
votes
0
answers
424
views
An Evil Cartesian Psycho
I came up with this puzzle when I was in high school.
There is an island owned by an evil man who keeps some tourists who were visiting the island a few years ago captive.
The authorities demanded ...
- 2,272
8
votes
0
answers
228
views
There are 49 cards here. Figure out what the seven facedown cards are and what position they're in
So here's the problem
"There are 49 cards here. Can you figure out what the seven facedown cards are and what position they're in?"
I have tried about everything in my math tool belt to try ...
- 10.4k
8
votes
0
answers
556
views
Ode to a Nightingale: a puzzling study in literary criticism
The field of literary criticism is an interesting and fruitful one, in which puzzlers might carve out a niche. This was recently brought home by a conversation I had with a sagacious old gentleman in ...
- 5,430
8
votes
0
answers
529
views
Impossible Cipher v1.0
When I create riddles, ciphers etc.. they seem to get solved within only a couple of days of writing. Well no more! This cipher may not be impossible but is extremely difficult. If left unsolved for ...
- 2,630
8
votes
0
answers
344
views
We found text from the year 2040!
Recently, the first surviving examples of text from the ███████████████e discovered! The unearthed artifacts included a collection of rectangular tablets inscribed in the hitherto unknow███████████████...
- 181
8
votes
0
answers
199
views
Is it possible to create a knot that is locked only when the rope is stretched?
Is it possible to create a knot that is stable/locked when the rope is stretched?
When the tension is relived the knot should open.
- 8,313
8
votes
0
answers
670
views
How to Complete this Cryptographic Challenge?
This question is from a CTF that a company (EY Cybersecurity) did almost a year ago. The original website is no longer available.
...
- 10.4k
7
votes
0
answers
165
views
Logic and geometry problem 2
My question is whether or not a deadlock can occur in Crisscross. A deadlock is defined as a position, an arrangement of checkers, in which the board has been filled but neither player has won.
...
- 6,959
7
votes
0
answers
308
views
Where are you according to this riddle?
Go forward, and you'll arrive back. Go back, and you'll arrive back. Go west and you'll come from the east. Go east and you'll come from the west. Jump once and you black out, jump twice and you're ...
- 322
7
votes
0
answers
897
views
They are all K-verbs
Find the missing verb.
G: Fold, Break, Pry
D: Reduce, Vibrate, Rob
B: Soak, Subtract, Thrash
J: Sleep, Squeeze, ?
Subtle Hint:
Moderate Hint:
Decisive Hint:
Very Decisive Hint:
- 5,257
7
votes
0
answers
197
views
Can you construct a nonagon with 47 rods?
Stiv's Diabolical Instruments now offers a bundle of exactly 47 equal-length rods that can be joined by hinges at their ends – and only the ends – to form planar linkages (i.e. all hinge axes are ...
- 7,820