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2
votes
1answer
46 views

How to fill 1/3 of the cylinder?

You are given 3 containers - pictured in this order below: a box with side 2, height 1, and a cone with base radius 1 and height 1 in the middle. a box with side 2, height 1, and a half sphere with ...
0
votes
0answers
81 views

As seen in a dream

...
1
vote
2answers
48 views

How to get the least number of flips to a plastic chips to get a certain figure?

The puzzle is as follows: (Transcription with grammar errors fixed) A game consists of the following: The challenge is to flip the chips in such a way so that they are as in state 2. You start in ...
-2
votes
0answers
26 views

How to get the least amount of pours to obtain a fractional amount of yoghurt?

The puzzle is as follows: A dairy plant in Milwaukee is well known for its yoghurt. However during the quality control a factory worker forgot to bring a set of adequate vessels to measure the ...
0
votes
2answers
42 views

What do these three towns have in common?

What do these three towns have in common? "Dublin", "Blackpool", "Chernobyl".
4
votes
0answers
42 views

I got [prefix] [suffix] [infix] from washing the [whole]

I got [prefix] [suffix] [infix] from washing the [whole]. P.S. I [infix] the [whole]. The note above, when the gaps are filled, will be a grammatical and reasonable note. What is the note?
3
votes
2answers
41 views

Pandigital fraction sum that evaluates to 1

Fill in the nine X spots in the following equation using each of 1, 2, ..., 9 exactly once, so that the equation is satisfied. The XX in the denominator denotes concatenation of two digits. $$ \frac{X}...
12
votes
1answer
433 views

Pentopia: One-way Crossing

This is an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the community. Here is a standard Pentopia puzzle. Rules of Pentopia: Place some pentominoes into the ...
20
votes
3answers
523 views

The Video Gamers' Double-Duty Crossword

"OK, so I know that you two are always arguing about what type of crosswords to do- 'Normal crosswords are too boring!' 'Cryptics are too esoteric!!' Trivia vs wordplay, yeah, I've heard both ...
2
votes
2answers
216 views

A strange Letter

1: Hey, could you please give me your car tomorrow? I have to go to the movie. 2: No, I don't think so. 1: Hey c'mon. You're my brother. You must help me. You ain't using it anyway. 2: Of course, I am ...
0
votes
1answer
95 views

How many 𝑛-digit integers have the property that the block of its first 𝑘 digits is a prime or divisible by 𝑘 for all 1 ≤ 𝑘 ≤ 𝑛?

Are there infinitely many integers with the property that the block of its first 𝑘 digits (for all 𝑘, 1 ≤ 𝑘 ≤ 𝑛, where 𝑛 is the number of its digits) is either a prime number or is divisible by 𝑘...
16
votes
0answers
211 views

Stupendous Sponge

General Notes This puzzle takes the form a 9×9×9 level-one Menger sponge whose surface is divided into 648 1×1 cells. The aim is to draw a single non-crossing loop along its surface by connecting the ...
7
votes
1answer
147 views

Message for my club members

Two people in particular have come to my Codes and Ciphers Club almost every week. One of them is always expecting a certain message to appear in the weekly puzzles, so of course I can't include it, ...
-4
votes
2answers
34 views

A challenge to make 1 - 100 [closed]

So this challenge is you have (don't have to) make the numbers 1 - 100 by using the numbers 1, 3, 4, 6 only once. I'm stuck on how to make 100. Can anyone help me? P. S. You can use +, -, ÷, x, ! And ...
3
votes
2answers
98 views

In the sea or in the sky

In the sea or in the sky Sometimes also in your eye. Melancholy feels like me But energy I have plenty. Into me you have vanished Out of me you're astonished What am I?
6
votes
2answers
187 views

What is the answer to “Message to go in the Times (5)”?

The clue is Message to go in the Times (5) What is the answer? Please included explanations of wordplay/indicators in your answer.
3
votes
1answer
286 views

Why is “HADAT” the solution to the crossword clue “went after”?

I was doing crossword from NY Times, from Mon, Feb 11, 2019 by Howard Barkin + Will Shortz and I got the following clue. Went after The answer is "HADAT". However, I can not find ...
13
votes
1answer
404 views

What is a Vexed 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 Vexed Word™. Use the ...
11
votes
1answer
261 views

Skyscrapers in Sudoku!!! - SS#10

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the tenth puzzle in this series! For more information about the series, see the first ...
20
votes
1answer
257 views

Didn't you ask me for a crossword?

An entry in Fortnightly Topic Challenge #forty-seven: "Wacky Sudokus" Here's that crossword you asked for... Sorry, what's that - you didn't ask me for a crossword?? TASK: Solve the puzzle ...
7
votes
4answers
479 views

Divided by Pie Squared. Aaahhh

I have a machine that can divide a square pie into 9 equal square pieces using 4 blades: The blades can be moved, but there is only one control - which defines the width of the blades in both ...
4
votes
0answers
54 views

Black board attack

How should black attack all the squares that has no piece on it (any unoccupied squares must be in check by black piece/s) with only ten legal moves for black? Start from position as shown.
11
votes
1answer
505 views

What is a Spelling Bee 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 Spelling Bee Word™. Use ...
11
votes
1answer
324 views

A filling Vowelburger™ Riddle

I ordered 5 Vowelburgers™ with buns, cheese and meat - help me identify each one from the menu! Cheese Vowelburger A bag E bite I cream O swelling U sprite Inspired by Avi’s Vowelburger™ ...
11
votes
2answers
374 views
+200

The Cryptic Cat strikes again! (2 Marching Bands)

Conversation with the Cryptic Cat after my last crossword: Cat: WHERE WERE THE CRYPTIC CLUES Me: Calm down! I just wanted to make a normal- Cat: Normal? What’s the point of a normal crossword? ...
7
votes
1answer
156 views

Three to Seven in five or less

Can you change the word Three to the word Seven in five steps or less with the following rules: You must exactly replace two letters; one vowel and one consonant of the word in each step with a ...
5
votes
4answers
501 views

8x8 square with no adjacent numbers summing to a prime

Can you fill a 8x8 grid with numbers from 1 to 8 such that: Every number occurs exactly once in each row and in each column (Latin square). No two adjacent (horizontally or vertically) numbers sum to ...
22
votes
4answers
4k views

What does 1+1=?

Most of this is is flavour, with a section of puns setting the scene at the start, and then the story itself in the middle. Scroll down for the actual puzzle. You may be interested to know that all ...
2
votes
2answers
263 views

Four touching circles

Three identical circles are placed such that they touch each other. A larger circle is drawn around the smaller circles such that it touches them, as shown in the diagram. Can you find the ratio ...
2
votes
1answer
66 views

4x4 square with no increasing triples

Can you fill a 4x4 grid with numbers from 1 to 4 such that: Every number occurs exactly once in each row and in each column (Latin square). No row or column contains 3 adjacent numbers that are all ...
15
votes
1answer
430 views

Chain Puzzle: Video Games #01 - Teleporting Crosswords!

This is the first Chain Puzzle in the Video Games series, in which all puzzles are themed around video games of all genres. The answer to this puzzle is a thematic word or phrase. The solver whose ...
21
votes
1answer
1k views

A Puzzling Sudoku (Warning: Hot!)

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" A Sudoku with an oddly familiar shape. Here's a Penpa Link. Rules: Normal Sudoku rules apply (Special) Thermometers: The ...
8
votes
1answer
264 views

A 7x7 Suguru - SS#9

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the ninth puzzle in this series! For more information about the series, see the first ...
4
votes
1answer
139 views

Solving Kordemsky's Prime Cryptarithm and proving uniqueness

This is a cryptarithm from Kordemsky's The Moscow Puzzles, problem 273 to be precise. Each digit is a single-digit prime ($2,3,5,$ or $7$). Find a solution and prove that it is unique. $$\begin{array}{...
3
votes
1answer
151 views

In the Cover of Darkness

I awoke in a mysterious desert wasteland that I didn't recognize. I looked around and saw nothing as far as I could see, except for the oddly rhythmic storm in the distance. Reaching for my phone, I ...
13
votes
1answer
331 views

A themeless noncryptic

ACROSS 1. Go away 4. Planned major port on the Pacific coast 6. Overreactive 9. 1940s escape routes from Europe 10. NEXT, for example 11. Olympiad champion 12. Vow 14. A Scottish Monday 16. Pinnacle ...
11
votes
2answers
404 views

A curious circuit

During our latest space mission to Mars, humankind has retrieved a curious alien circuit. Our historians think it must be a calendar of some sort. After speaking with some alien linguists, we know ...
9
votes
3answers
353 views

With a little effort, one can prevail

What is common between the following words and names? (Inspired by this except that I actually know the answer to this one) Defeat Kleenex? Guanaco Nerdiest Sardar Ian McKellen Dingo Gun Diablo ...
19
votes
2answers
1k views

Not so random walk

I'm out for a very long walk, and I’m bored, so I decide to walk in a mathematical way. The first image shows the first 500 steps, and the second image is my path after 50000 steps. The colors are ...
20
votes
2answers
2k views

What is a Peruvian 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 has a certain property, I call it a Peruvian Word™. You can use ...
5
votes
3answers
472 views

Progressive matrix - crosshatched vertical and horizontal lines in squares

I came across this puzzle in the subreddit r/puzzles, gave it a try, and couldn't solve it. It seems like no one else could either. Reverse image search found it on a site called IQ certificate, so I'...
33
votes
5answers
8k views

What is a Racist 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 Racist Word™. (...
7
votes
1answer
383 views

A perfect puzzle for lockdown

(Every part of this question is part of the puzzle.) Only one clue to go! The following are some CRYPTIC CLUES that all relate to a THEME. The first group of clues are only TANGENTIALLY related to the ...
-2
votes
4answers
294 views

My prefix, suffix and infix are right in front of you right now [closed]

My prefix, suffix and infix are right in front of you right now, displayed in this order: Suffix Prefix Infix What am I? Hint:
10
votes
1answer
339 views

Nurikabe: The Super-Kabe Attacks!

This puzzle is another Nurikabe, but with a new twist for me: it's a gigantic Super-Kabe! It's also, in my opinion, quite tricky and has some interesting deductions. I hope you enjoy! Rules of a ...
26
votes
1answer
3k views

What is a Perfect 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 Perfect Word™. Use the ...
23
votes
1answer
1k views

The Blank Sudoku

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" (h/t to Beastly Gerbil, whose 1,2,3... Trinary!!! puzzle provided inspiration for this puzzle) This puzzle is a normal Sudoku, ...
9
votes
3answers
378 views

What is a Riven Word™ / Phrase™?

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 Riven Word™ or Phrase™. ...
10
votes
1answer
433 views

A Difficult Wacky Sudoku - SS#8

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the eighth puzzle in this series! For more information about the series, see the first ...
10
votes
1answer
117 views

My prefix is where we are

My First 'Riley Riddle' - hopefully not too hard or easy: My prefix is where we are. My infix is done with force over a distance. My suffix is castled for safekeeping. What am I?

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