Newest Questions
29,669 questions
6
votes
2
answers
100
views
Descriptive Grid
What is the hidden rule that will lead you to an answer? Explain your reasoning.
- 53.4k
6
votes
1
answer
156
views
A Sequence of Words
I created a sequence of words (see a Note below) using a certain method and came up with somewhat cryptic clues for them.
Unlike in crossword puzzles, I did not include word lengths with these clues.
...
- 727
9
votes
1
answer
150
views
Regular pentagram inscribed in a parabola
The diagram shows a regular pentagram inscribed in a parabola.
Can another red pentagon (congruent to the one shown) fit in the gray region?
- 5,165
3
votes
5
answers
388
views
Find all integers n such that the sum of the factorials of its digits equals ⌊√n⌋
Find all integers n such that the sum of the factorials of its digits equals ⌊√n⌋.
For example, if n=2025, then 2!+0!+2!+5!=⌊√2025⌋, although this is not true.
How can you find all integers n that ...
- 1,931
5
votes
0
answers
128
views
What is the history behind this chess position?
In the game depicted below, Black managed to come out on top by delivering checkmate to the white king trapped in the corner. On the way to this outcome, seven pieces were captured at several points ...
- 10.6k
-6
votes
7
answers
146
views
How do you get 5 by using the numbers 2, 2, 3 and 5?
You can use addition, multiplication, subtraction, and division as many times as you want but can only use the numbers one time each.
-3
votes
0
answers
57
views
What is the context? [closed]
As a technical writer, I know that CCVC represents words that begin with consonant-consonant-vowel-consonant, then one would assume a CCC words are words beginning with three consonants but that isn't ...
- 1
9
votes
0
answers
258
views
What is the Mythical Creature?
A mythical creature links the five images below.
Can you identify the mythical creature and explain each of the images?
- 140k
0
votes
0
answers
65
views
Shadowed Dragon Ciphers: #2
This is the SHADOW Cipher in a small sample. One of my hardest, Good Luck!:
Z+b s v k v x w z d o x
-The Shadowed Dragon
12
votes
2
answers
686
views
Three-cushion billiards challenge.
World champion three-cushion billiards player can perfectly make a billiard ball end where asked for (if possible), on a standard rectangular shaped competition table.
The champion now, for ...
- 3,016
11
votes
1
answer
944
views
Let’s go to the pub! Hey, we’re all thirsty but some of us don’t want to get drunk.
Let’s go to the pub!
Hey, we’re all thirsty but some of us don’t want to get drunk.
Inspiration for my puzzle came from the puzzle below:
22
votes
1
answer
581
views
Quilt of many colours
Why is this quilt coloured the way it is?
(You do not need to do any image manipulation or analysis to solve this puzzle.)
CSV for grid colours (R = Red, G = Green, B = Blue, Y = Yellow, M = Magenta, ...
- 1,830
14
votes
3
answers
836
views
A "crappy" pentagon puzzle
Lately, we've had plenty of puzzles based on the regular pentagon and its geometric properties. So I propose one that literally brings it all together.
Use eleven copies of the larger (left) piece ...
- 2,694
10
votes
0
answers
442
views
+50
What is a CCC word?
This table shows some, but not all, CCC words and several similar non-CCC words. (Came up with this puzzle myself)
CCC Words
Non-CCC words
gizmo
gadget
decriminalize
deconstruct
juxtapose
oppose
...
- 361
3
votes
1
answer
203
views
No pictures - just words
Complete the sentence to solve this rebus-like puzzle.
He managed to get her
so they can be ___________.
This is my own.
- 727
11
votes
1
answer
754
views
Sliding coins down an envelope
The envelope is a regular pentagon with two diagonals. The red coins are two vertically aligned and touching congruent circles, the top one passing through the apex of the pentagon, and the bottom ...
- 20k
8
votes
1
answer
457
views
Dec. 31 rebus from Games magazine
To partially check your answer:
Attribution:
Mike Martinek in the November/December 1979 issue of Games magazine.
3
votes
1
answer
481
views
JANOB rebus. Can you solve it?
JANOB
To partially check your answer:
Attribution:
Dennis Wade in the November/December 1979 issue of Games magazine.
7
votes
1
answer
232
views
Not a Kind Rebus
Find what "😈" represents and find what word for sure must replace "?".
😈(FIX)
+
😈(FED)
+
😈(?)
+
😈(GOT)
=
😈
- 53.4k
14
votes
2
answers
1k
views
Vertical bars...or I mean...well, you'll get what I mean
Find the hidden answer which describes what you've found.
...
- 53.4k
22
votes
1
answer
711
views
Percentage as squares or higher powers?
In a class, the teacher wrote 12%, 40% and 73% on a whiteboard.
When the teacher asked the class what those numbers are, a student said they're all square numbers, with being 12% and 40% even higher ...
- 1,931
-5
votes
3
answers
207
views
Joining Numbers Together [closed]
puzzle from 2.191.149.204 — lv. easy
Numbers are cool. If you join two (or more) numbers together, you get another valid number. For example add 3,756 and 4,192 together. You get 37,564,192 which is ...
- 3
14
votes
5
answers
2k
views
prisoners riddle - a button, a light and a timer
Here is (yet another) prisoner riddle. I made it up (maybe it was asked before, but to the best of my knowledge I'm the first to ask it - correct me if I'm wrong).
There are 1000 prisoners who are ...
- 143
-5
votes
1
answer
164
views
It could be magic
You could enjoy a ride as well...
This is my idea implemented with ChatGPT assistance
- 727
3
votes
2
answers
754
views
How many gloves do we need to randomly select to ensure each octopus will have 8 different colored gloves? [closed]
The restaurant is a major sponsor of the Aquatic Boxers’ Club. From time to time, two octopuses from the ABC are invited to the restaurant to put on a boxing match in an aquarium, for the ...
19
votes
3
answers
1k
views
Two semicircles in a parallelogram
Two congruent semicircles (blue) are inscribed in the two triangles formed by the short diagonal (black) of a parallelogram (also black) as shown below. The short diagonal has the same length as the ...
- 20k
10
votes
2
answers
948
views
Short and sweet puzzle
Figure out the picture and savor the fruit of your labor...
This is my own idea
- 727
1
vote
1
answer
204
views
My Most Recent Chess Tournament
This is a lightweight puzzle, hopefully entertaining but not difficult. Since my FIDE rating for classical Chess is 2343 at the time of writing, I recommend you do not post a solution to this puzzle ...
- 7,920
4
votes
3
answers
644
views
+250
Multiplying pounds and shillings swaps the numbers
If you double £6 13s, you get £13 6s, which is merely changing the shillings and the pounds.
Can you find all the other sums of money that has the same peculiarity that, when multiplied by any integer ...
- 7,575
1
vote
2
answers
215
views
If it takes n weighings to identify the fake coin among k coins, then n+1 weighings will be required to identify the fake coin among 3k+3 coins
I was trying to solve the following puzzle:
"We are given 12 coins. 11 of them are genuine and 1 is fake. All of the genuine coins weigh the same. The fake coin is either lighter or heavier than ...
- 7,575
2
votes
4
answers
311
views
Explain deduction from LinkedIn's Queen #564
LinkedIn's Queen #564 (HARD difficulty)
I am watching the commentary of today's Queen puzzle (a 1* Star Battle puzzle), given that I complete it in about 2 minutes. But one thing I don't quite ...
- 109
3
votes
2
answers
209
views
Interesting dates for a person
A person is very excited for these dates, and these are the only dates he is very excited for.
April 22, 2204
November 23, 2311
November 24, 2411
May 25, 2505
January 17, 1701 counts if we don't base ...
- 1,931
1
vote
0
answers
103
views
How do I solve Jumble word puzzles using the scrambled letters and final answer pattern?
I'm trying to understand how to solve Jumble puzzles (the daily word scramble puzzle).
Each puzzle gives:
Four scrambled words
Some circled letters from each word
A final answer with a pattern of ...
- 11
2
votes
2
answers
191
views
8
votes
2
answers
629
views
-3
votes
1
answer
245
views
Lewis Carroll with Probabilities
Here's a famous Lewis Carroll problem:
Babies are illogical
Nobody is despised who can manage a crocodile
Illogical persons are despised
The conclusion is: Babies cannot manage crocodiles.
I've ...
- 846
2
votes
0
answers
96
views
Is there a Python solver for the Picture-Cube?
I'm working on a CayleyPy project where we study the diameters of graphs that come from different combinatorial puzzles. At the moment I’m focusing on the Picture-Cube, a 3×3×3 puzzle where each move ...
- 29
7
votes
1
answer
318
views
7
votes
1
answer
428
views
14
votes
4
answers
1k
views
Numbers which are the product of two numbers that share no digits
Say a positive integer is cute if it can be written as the product of two other integers greater than 1 that share none of their digits.
a) Find 12 consecutive integers all of which are cute.
b) Are ...
2
votes
1
answer
353
views
A Cypher I Created: U+74 U+48 U+65 U+20 U+72 U+65 U+61 ...
This is a compound cypher meaning it is several cypher methods inside of each other.
U+74 U+48 U+65 U+20 U+72 U+65 U+61 U+70 U+65 U+72 U+20 U+69 U+73 U+20 U+43 U+4F U+6D U+69 U+4E U+67 U+20 U+61 U+4E ...
4
votes
1
answer
268
views
The sum of divisors of current year is also the current year
We already knew that the current year is sum of first 9 perfect cubes and there is another hidden interesting fact.
But there is another twist: The sum of divisors of current year is also the current ...
- 1,931
5
votes
1
answer
458
views
Second-lightest coin from 30 with a 5-way balance
The following problem is lightly adapted from AoPS.
You have 30 coins of identical appearance but distinct weights. You have only a balance that can rank exactly 5 coins from lightest to heaviest. ...
- 10.5k
28
votes
2
answers
774
views
2-Dimensional Music
I've been listening to 1-dimensional music for most of my life. You know, the flat kind that only moves forward in time.
Only recently did I discover 2-dimensional music!
It really adds depth to the ...
- 7,676
2
votes
1
answer
125
views
6
votes
4
answers
675
views
Action / Counter-action riddle
The word is action
Its anagram - counter-action (to the action)
This is my own.
Additional details (added 11/12/25):
These actions belong to a political process.
Each word is both a noun and a verb.
...
- 727
-1
votes
0
answers
244
views
Do solutions exist for 3D tiling with Pentaminos/Pentacubes?
To make a long story short, I have developed an IOS App running the classic game with Pentaminos and Pentacubes (see my profile for details). I am now considering the tiling option game with the same ...
- 119
13
votes
1
answer
757
views
It's a seven letter word
It started with an argument
And ended with a fight
With a weapon no less
All over this tiny little thing?
- 10.2k
8
votes
4
answers
1k
views
Find the missing digits in 1/2024
1/2024 is equal to $0.000\overline{a9407114b245059c88d375}$.
Can you find the values of a, b, c, and d without using a calculator?
Long division is trivial. Can you use other ways to find the missing ...
- 1,931
0
votes
1
answer
157
views
Knights, Knaves and Spies, unclear solution provided
Puzzle
You are on an island inhabited by three types of people: those who only tell the truth (knights), those who only tell
lies (knaves), and those who sometimes tell the truth and sometimes tell ...
- 111