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2
votes
1answer
78 views

Universal bisectors

A bisector is something that cuts some other thing into two equal pieces. More concretely, assume we are given a reasonably well-behaved (for example, compact) 3D object and we are looking for planes ...
7
votes
2answers
194 views

The Perplhexing Mystery

There has been a jailbreak in my (imaginary) town. And I, a Junior Detective of the town, have gone to investigate this. As I reach the police station, an inspector comes out to greet me. No doubt he ...
2
votes
0answers
89 views

Guineas Dealer ||||||||

This visionary turns into a comedian, an animal and a fictional hero around Christmas. What is his favorite machine? Note: The lines after the word "Dealer" in the title have nothing to do ...
2
votes
1answer
73 views

A Surprising Riley Riddle

My infix is a potato reporter, My suffix is a garden storer, My prefix is Martin's significant other, My whole will make you bowled over. What am I?
0
votes
0answers
66 views

Bisecting a 3D object into two equal volume objects - 2

Given the following 3D object and means of an unmarked ruler to draw lines on its surface define a straight cut that will split it into two objects with the same volume. Hint: It seems to have at ...
2
votes
1answer
205 views

Statement: [infix] will [whole] [suffix] [prefix] [infix] will

[infix] will [whole] [suffix] [prefix] [infix] will. The above, when the gaps are filled, will be a reasonable statement. What are the two infixes?
3
votes
2answers
154 views

Primes and squares in a grid

i) Place thirteen different three-digit prime numbers in the empty cells of this grid. ii) Now place thirteen different three-digit square numbers in the empty cells of this grid. How many solutions ...
-5
votes
1answer
79 views

Relations between numbers taken three at a time [closed]

Let's have the following numbers. $(5i+\frac{1}{2})$, $(2i+3)$, $(\frac{-101}{8})$, $(7i+4)$, $(5i+1)$, $\frac{(40i-97)}{8}$. How are these numbers related when taken three at a time? Operations ...
4
votes
1answer
113 views

When is the full moon?

During each lunar cycle, the full moon is technically full for one instant, but to the human observer, the moon appears full for 2-3 days and nights in a row, making it hard to tell on which date and ...
4
votes
1answer
1k views

Find three ways of forming the number 100 using 3,3,5,7

As it says in the title. Rules: anything not explicitly allowed is forbidden. use 3, 3, 5, 7 and multiplication, division, sum, difference, unary minus, and exponentiation in any order. Parentheses ...
-8
votes
0answers
103 views

Crack the code: csdsgsdsfgsfsfcsdsgsgs

My friend gave me this code which they say is basic. Can you help me? csdsgsdsfgsfsfcsdsgsgs That is the code, can any of you solve it?
1
vote
1answer
59 views

Unusual Vowelburgers™

Inspired by Avi's Vowelburger™ Riddle and the variations thereof I got these Vowelburgers™ on discount, and they have a little different mouthfeel than others. Why is that? Patty Vowelburger™ A Ink ...
10
votes
1answer
150 views

Three white queens, two white knights, and one rook on a chess board

On an 8 x 8 chessboard, place three white queens, two white knights, and one white rook so that every cell of the board is under attack by at least one piece not standing on it. Source: https://www....
11
votes
0answers
237 views
+100

A new adventure awaits! Let's go!

A tale is being told here, one that spans many years and generations... but what kind of tale might it be? Pastebin link to a transcript of the clues, including colorblind assistance. Note that Y = ...
-1
votes
0answers
81 views

Hard IQ Test Puzzle [closed]

Can someone please help me to find the answer to the puzzle?
1
vote
1answer
50 views

What's at my back?

I always have something on my back whenever I use my PC and I have some definitons to figure out what it is. financial institution that accepts deposits from the public a family of large marine ...
-3
votes
0answers
152 views

When is the final telephone post installed? [closed]

The puzzle is as follows: The Philadelphia telephone company will install 35 telephone poles along Broad Street. Each post must be located at equal distances from each other. It is known that the ...
-1
votes
1answer
99 views

I invited them and no one came

My colleague told me this morning with frustration: To 200 friends I sent invitations to my birthday party, and not one person came. The last paragraph of the invitation had a mysterious sentence ...
0
votes
1answer
73 views

Number of turns for two wheels to bring edge-points together

The puzzle is as follows: We present you below this riddle. A certain mechanism opens a gate of a maximum security lab. It just happens that a glass lets you see the mechanism and you know the ...
1
vote
4answers
114 views

I need some help with this 15x15 nonogram

I have been working on this nonogram for some time and can't seen to figure out what to do next... This is the link: https://nonograms-katana.com/play/#game
-3
votes
0answers
70 views

Can anyone think of more examples of pair of words like “Mindful” and “Mind full”? Both sound same and have different/opposite meanings [closed]

I am looking for pair of words or using multiple words which sounds similar but have different/opposite meanings(like an example mentioned in the question above). I posted this question in English....
9
votes
1answer
280 views

The Alan Parrish question

Two stereotypical british gentlemen that don't know each other engage in this unusual conversation (it's almost as if they were a setup for a puzzle): Gentleman A - Hello sir, I'll have you know that ...
11
votes
1answer
222 views

The Green Periodic Puzzle

This puzzle follows from the Purple Periodic Puzzle (these puzzles are solved individually). Another strange periodic table has appeared and it's hiding a secret word. Can you find out what's strange ...
2
votes
0answers
58 views

Fair and square island hopping [duplicate]

If amateur fiction is not your thing skip to the bottom. As IP (Implausible Physics) expert for DREAM, the Department for Reckless Engineering and Advanced Megalomania you have been tasked by sheikh ...
8
votes
3answers
560 views

Calculation - the hard way

This is a puzzle I love to play with my math students and I hope you will enjoy it too: You are given the numbers 1, 2, 3, 4, and 5 exactly once. Your target is a number, e.g. 36. Can you create a ...
10
votes
1answer
187 views
+100

A Peculiar Find-A-Word

I was solving a crossword in my local newspaper when I came across a clue that made no sense: 19 Across: Be inappropriate On the face of it, there is nothing odd with this clue until I realised: 19 ...
53
votes
1answer
2k views

28 Minutes Later

An entry in Fortnightly Topic Challenge #50: Escape Rooms I open my eyes to find myself lying in a bed in a white room. Sitting up is difficult, as a tangle of wires and tubes are attached to my arms ...
-6
votes
3answers
189 views

Peas at the barbecue saved the day!

You were at your neighborhood barbeque when noticed a lady reporting a theft to the police. This is what you heard: Lady: Help! A man grabbed my purse and ran away! Police: Did you notice anything ...
16
votes
1answer
494 views

The Purple Periodic Puzzle

Below is a periodic table that's hiding a secret word. Can you find out what's strange about this purple periodic table and find the answer. Text-only version: ...
-4
votes
0answers
43 views

How to find a zip file as large as possible [closed]

How one can find a text file with 1000 bytes which zip file is as large as possible? I think it must be over 1000 bytes.
-6
votes
0answers
62 views

Finding the hypotenuse of a right angle triangle when one side has been given [closed]

If one side of a right angle triangle has length equal to $a^{n-1}$, where $n\ge2$ and $a$ is any odd number greater than 1, how do we find the length of the hypotenuse? The lengths of the sides of ...
0
votes
0answers
49 views

Decrypting a block cipher puzzle from a hex string [closed]

I have the following hex-string puzzle: ...
12
votes
4answers
2k views

How many matchsticks need to be removed so there are no equilateral triangles?

The puzzle is as follows [with minor copy edits for grammar]: By only using matchsticks of equal length a set of equilateral triangles has been built as indicated in the figure from below. With that ...
5
votes
1answer
213 views

How to get the least possible sum in a closed loop set of squares?

The puzzle is as follows: The figure from below represents a set of 12 squares joined forming a closed loop. By using only the numbers from 1 to 12 fill in the blanks. The condition is that, without ...
1
vote
2answers
141 views

How many lines are needed to connect all smiling toasters in a 4x4 grid?

The puzzle is as follows: How many straight lines do you need to draw the least possible to join all the smiling toasters if you should not raise the pen or go over any line already drawn? Remember ...
4
votes
1answer
317 views

Two knight tours on a 4x4 grid

Two knights are placed on opposite corners of a 4x4 grid. Can you move* each knight 7 times, such that each cell of the grid is visited exactly once by exactly one of the knights? *Note that a knight ...
1
vote
2answers
221 views

Minimize the longest King chain on a 6x6 ternary grid

This puzzle is an extension of this one: Minimize the longest King chain on a 5x5 binary board Given a grid filled with numbers, we define a King chain to be a path on the grid such that: The path ...
0
votes
1answer
118 views

Minimize the longest King chain on a 7x7 binary grid

This puzzle is an extension of this one: Minimize the longest King chain on a 5x5 binary board Given a grid filled with numbers, we define a King chain to be a path on the grid such that: The path ...
10
votes
1answer
406 views

Sometimes with Feathers?

When in red, I was very loud. In high definition, a treasure. You put me in to interfere. Rest on me for your leisure. Put me between the last two letters, I am an Asian plant. Keep some of me in the ...
-1
votes
1answer
60 views

intercepting the box [duplicate]

If you need to send a message in a box to a person so that no one can intercept it and get the message, how do you do so if you have a padlock and key and they have a padlock and key
3
votes
1answer
81 views

Vowelburger™ Inside-Out Burger

Inspired by Avi's Vowelburger™ Riddle here and Ébe Isaac's Double Supreme Riddle. The local Vowelburgers™ has added a new item to their ever-expanding menu, the Inside-Out Burger! This peculiar ...
5
votes
0answers
185 views

Choosing squares on a square board [closed]

I have an $8 \times 8$ board. On the board, I want to choose 2 unit squares in each column and row such that none of the chosen squares are touching. This means they cannot share a side or a corner. ...
7
votes
0answers
230 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 ...
12
votes
1answer
951 views

Working as a Family

Within this Boggle grid are the names of the members of a family. The unused letters will reveal the name of the original head honcho. ...
4
votes
1answer
131 views

Chess - I will eat!

Suppose that you are playing White, and your aim is to eat a black piece (pawns qualitfy) in the fewest moves as possible and Black are not cooperating at all, and, even more, Black's aim is to ...
13
votes
1answer
2k views

A Math Riddle: But the math does not add up

Grandpa had a lot of different books of stamps on his desk. He was counting them. I was curious. “What are all those stamps Grandpa?” “I just got back from the Post Office son and bought a bunch of ...
0
votes
0answers
197 views

These words have the same properties, but how?

Asparagus, Man, Erode, Aerodynamic, Innards, Bins Mine, Rob, Fort, Hexagon, Tera, Nights Flashbacks, Lost, Mono, Grand, Dystopia, Focus Splashdown, Troupe, Karate, Duel, Catchy, Contact Acrobat, ...
4
votes
2answers
229 views

All possible locations of a robot going from $(x,y)$ to $(x+y, y)$ or $(x,x+y)$ [closed]

Suppose I had a little robot on the coordinate grid that moves according to the following rule. If it's at the point $(x,y)$, it can move to either $(x+y,y)$ or $(x,x+y)$. If the robot starts at the ...
6
votes
1answer
435 views

The Pub Quiz and the Passion

An entry in Fortnightly Topic Challenge #49: Pub Quiz Camouflage...a day or two late. Oops. Your local pub has an interesting way to show their pub quiz questions--sixteen televisions in a four-by-...
2
votes
1answer
124 views

Rebuses with answers that start with “A”

I like rebuses, here are four of them. 1. 2. 3. 4. Good luck!

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