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5
votes
1answer
336 views

ABCDEFGHIJKLMNOPQRSTUVWXYZ

You are finding 3 places. Also, Kiribati's flag is for checking if you got the "places" correcct. Hint 1: Hint 2:
13
votes
1answer
325 views

I am a creature from the ancient world

My head has two faces. My upper body is powerful. My belt honors two great men. My legs and feet are numbered incorrectly. What am I?
7
votes
1answer
181 views

A ----------y Puzzle

The puzzle below asks a question. Can you answer it?
4
votes
2answers
617 views

A rectangle cut into two pieces, which build a square

A rectangle with side length a and b are in ratio $a : b = (n+1)^2 : n^2$, where n is a positive integer. Is it possible to cut each such rectangle into two pieces, which can be put together to build ...
8
votes
2answers
348 views

PSE Advent Calendar 2021 (Day 3): Tentai Show

This puzzle is part of the Puzzling StackExchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door > Divide the ...
5
votes
0answers
70 views

Camel-eon 8x8 tour

This question is inspired by the Chameleon 8x8 tour puzzle. A knight is a chess piece that moves by jumping to a square $\sqrt 5$ units from its location. (The more conventional way to put it is that ...
5
votes
5answers
2k views

Help needed with my niece's math puzzle

My niece is having problems with the attached and I can't figure it out. I think I'm overcomplicating it. Does anyone have thoughts on how to solve it?
16
votes
2answers
583 views

PSE Advent Calendar 2021 (Day 2): A Christmas Tree for broke Nerds

This puzzle is part of the Puzzling StackExchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door > Question: ...
8
votes
0answers
75 views

Rigid regular nonagon from 21 Meccano strips

You are given 21 Meccano strips, where the distance between adjacent holes is 1 unit: 9 strips of length 10 (hence having 11 holes) 6 strips of length 18 (19 holes) 6 strips of length 19 (20 holes) ...
2
votes
1answer
274 views

The commanding Riley

My prefix is a form of money. My suffix has electrical charge. My infix is your abbreviation. Altogether I command. What am I?
1
vote
1answer
117 views

How can the princess escape the prince?

This is the story of the sister of the princess in this puzzle. I will shamelessly copy-paste some parts of this post. I have no reference to give for this version as I adapted a Computer Science ...
3
votes
0answers
83 views

Help Alice and Bob divide up their finances

Our friends Alice and Bob must separate their finances. They divide up the first 18 items as follows. Alice Bob Apartment House Fee Owe Purchase Sell Money Income Lease Borrow Debt Loan Tax ...
3
votes
0answers
146 views

I Don't Understand This Crossword [Puzzle]

What Notable Object is the Following Crossword Cluing? Across: 1. Clattering or banging, for example (5) 2. Has never been done before (8) 3. Fiery pit (4) 4. Exam answer (8) 5. Very cream of ...
6
votes
1answer
295 views

My prefix rids sinning, my suffix is swimming

I thought of this riddle with my sister. Feedback is appreciated. My prefix rids sinning. My suffix is swimming. My infix is cheeky. And where I live its weedy. Who am I?
28
votes
1answer
1k views
+50

PSE Advent Calendar 2021 (Day 1): La laa laaaaaa laa la Christmas

This puzzle is part of the Puzzling StackExchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 50 reputation.Next Door > ...la laaa laaa laaa la la: ...
12
votes
2answers
948 views

Laser and mirrors on a 4x4 grid

You are given an empty 4x4 grid. You can place some diagonal mirrors into the cells of the grid. You then fire a laser from some location outside of the grid. The laser travels in a straight line. ...
0
votes
2answers
129 views

How can we allocate when we have 150 open slots every day (5 days a week) for those 200 arrivals every day

My question is to solve a very basic problem related to the allocation of slots. Say there are 20 teams with 10 persons in each team. I have 150 open slots every day (5 days a week) for those 20 teams ...
22
votes
1answer
339 views

The Video Gamers' Double-Duty Crossword 2

See the original HERE Video games — Trivia vs Wordplay — one more time: Here are twenty crossword clues that describe twenty video games. Solve them if you'd like! Or, if you treat each clue as ...
0
votes
2answers
186 views

Sequences on an IQ Test

I found this IQ test (http://free.ultimaiq.net/nse.htm) and can't seem to solve questions 18 and 19: Q18: 120, 10, 3, ?, ? Q19: 41, 23, 61, ?
2
votes
0answers
102 views

What is the pattern in this IQ test problem?

The image is a little bit confusing. But the pattern is supposed to be 2 > 4 > 6 > 8 > 10 (the answer) > 12 circles This one really had me scratching my head. I noticed that the bottom ...
28
votes
1answer
2k views

Between you and me

🟥🟥🟥🟥🟥 ⬛⬛ ⬜⬜⬜⬜ air pollution ⬜⬜⬜⬜ wildebeests ⬜⬜⬜⬜ bullets ⬜⬜⬜⬜ whine ⬜⬜⬜⬜ cozy Your final answer should be an appropriate image.
14
votes
3answers
1k views

Chameleon 8x8 Tour

It is known that a knight can visit every cell of a 8x8 chess board exactly once. Here we consider the same task for a chameleon chess piece. This piece begins as a knight, then it transforms into a ...
2
votes
3answers
207 views

Reversible number problem

These are the reversible numbers In this example we have an operation that on one side gives the result 6 and turning it gives it 12. Is it possible using reversible numbers and mathematical ...
3
votes
2answers
308 views

How many seats around the table?

This puzzle is very much inspired by a recent, excellent, one, posted here. If anyone, in particular the author of the other puzzle, prefers this one to disappear, I will immediately do so and I ...
2
votes
1answer
112 views

Find two integers based on their sum and a random number

Alice, Bob and Charlie play a game. Alice writes down two positive integers on a blackboard visible to Bob and Charlie. She says that one of them is of her own choice, the other number is the sum of ...
29
votes
1answer
2k views

The grass is greener on the other side (it's a matter of perspective)

What word is hidden in this image?
4
votes
1answer
212 views

10x10 Fillomino

Interactive solving website For help/rules on solving, please look at the website's "help" section, which lists fillomino rules. Please use the website to solve the puzzle unless you are ...
-2
votes
1answer
148 views

Colored trominoes touching corner-to-corner on a grid

Let's have an 8x8 GRID to be filled with L-trominoes of 3 different colors. 64 squares leave room for 21 trominoes, so there should be 7 trominoes of each color and one empty square. Trominoes of the ...
8
votes
2answers
413 views

Form an equilateral triangle

Alice and Bob take turns to mark points in $\mathbb{R^2}$ (i.e. infinite 2D plane). Alice can only mark $1$ point on her turn, while Bob can mark $4$ points. They're free to mark their points anywhere ...
3
votes
3answers
249 views

Can any two different 3×3 scrambled cubes be exactly same on all the faces?

There are millions of Rubik's cube combinations possible. If I have two 3×3 Rubik's cubes and both are scrambled, I want to make one scrambled cube exactly the same as the other without solving them. ...
-1
votes
2answers
222 views

Number of elements as compound

What simple compound is precious to life and encodes the total number of elements? What other thing does it code and is revered by some as precious to life? Accepted solution should show how the ...
9
votes
0answers
200 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).
13
votes
1answer
431 views

Enigmatic maths

$\left\lceil{\left(\left(2-1\right)^{19}+5\right)^{\left(\frac{20-23-5+14}{\left(\cos\left(\cos\left(\sin\left(\sqrt{\ln\left(\ln\left(\frac{20-\sqrt{25}\cdot19}{9-24}\right)\right)}\right)\right)\...
24
votes
1answer
364 views

Seven Part Exhibit

What word is displayed by these seven clues?
3
votes
1answer
306 views

How many consecutive integers to ensure one has digit sum divisible by 19?

How many consecutive positive integers are at least required, such that there is always a number in such a sequence whose sum of digits is divisible by 19?
3
votes
1answer
88 views

Two pairs of dice with the same probability [duplicate]

Alice has two dice each numbered from 1 to 6. Bob has two dice as well, the numbering is not known, but each face has a positive integer. The numbering on each dice can be different and a number can ...
4
votes
1answer
421 views
+50

A simple rebus for you all!

A simple rebus puzzle for you all!
3
votes
1answer
178 views

The Mermaids' Rooms

You have been tasked with assigning rooms to some mermaids who have visited the hotel. There are 9 mermaids: One is bald and bare-skinned One has a layer of fur One has a thick bark on their back One ...
-3
votes
0answers
124 views

What is the next number of the sequences? [closed]

What is the next number and why? 3,7,10,11,12,17,?
11
votes
2answers
590 views
+150

Introducing S-sequences: which is the shortest to contain all integers 1 to 20?

Consider a sequence (finite or infinite) of different positive integers, such as the following, in which the first term is 1, and thereafter the nth term is either the previous term plus n, minus n, ...
3
votes
3answers
162 views

A small pond-crossing

While walking through the flower gardens, you encounter a small group of fairies stuck on a lilypad. There are 2 red fairies, 2 yellow fairies, and 2 green fairies, and they have nothing besides a ...
-3
votes
0answers
125 views

minimum liars- truth tellers dwarves pairs [closed]

Each of the 88 dwarfs living on the farm has at least one friend. Of these dwarves, 44 are honest and always truthful, and 44 are liars and always lie. When Keloğlan visited the farm, 44 of the dwarfs ...
6
votes
1answer
161 views

42 lines on a chessboard with associated numbers

The 64 squares of a chessboard can be associated with 42 lines as follows: the 8 rows the 8 columns 13 diagonals from north-west to south-east 13 diagonals from north-east to south-west Those ...
6
votes
1answer
317 views

Puppet for a hat

Smallest by the banded one, the biggest, then the lead Extend to wave or crouch in anger, half-way-hunch to knead The clever use them alike the dim, though perhaps not to count The most unfortunate of ...
8
votes
0answers
263 views

Interrupting your day to bring you a puzzle

Please explain the following math. To start, here are some basic relationships - creative thinking may help (or not) 1) p < c < h < n1 <= n2 The pipe symbol is used as shorthand for ...
6
votes
2answers
321 views

A Riddle of Subtraction

You might have to use some creative thinking for this riddle. Start with the one which has 4 Take out the 7 and you end up with an 8. Start with one which has 5 Take out the 7 and you end up with a ...
7
votes
0answers
367 views

Can Alice form a unit square?

Alice and Bob take turns to mark points in $\mathbb{R^2}$ (i.e. infinite 2D plane). Alice can only mark $1$ point on her turn, while Bob can mark $N$. They're free to mark their points anywhere as ...
26
votes
1answer
1k views

A gross of colored dots

The answer to this puzzle is a person. Transcript of the colors: ...
9
votes
1answer
276 views

Cryptic Acrostic 3: Built So Fly

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 ...
0
votes
1answer
159 views

I often come from nothing, who am I?

I often come from nothing My worth cannot be inherited or given Put me in a winning position And my success is still not guaranteed What I give you has no utility But it's something you wouldn't want ...

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