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1
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2answers
13 views

Doubly Pure Checkmate

A pure checkmate is a checkmate where for each square the king might go to, there’s exactly one reason it can’t. The famous Légal mate is one example, so is a KR vs K checkmate. What’s the minimum ...
4
votes
1answer
26 views

A [prefix] at [infix] early [suffix] can't [whole] everything

A [prefix] at [infix] early [suffix] can't [whole] everything. What is the logical statement when the gaps are filled?
1
vote
1answer
69 views

What letter comes next in the sequence A, P, I, W, A, T

What letter comes next in the sequence: A, P, I, W, A, T, ?
3
votes
1answer
31 views

A Final Digitial Sudoku! - SS#14

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the final puzzle in this series! For more information about the series, see the first ...
7
votes
2answers
72 views

Unequal Curfew - Donut Hole

This is a Curfew variant. Curfew is a genre invented by Hempuli; I made a slight modification to give this variant. Rules of Unequal Curfew: Draw a loop that visits every circle. Each visit to a room ...
0
votes
1answer
41 views

Mirror Mirror On The Board

Mirror mirror in the board Decipher the riddle of this horde How many moves to it, please? To put my brain at ease! Both sides help, follow their paths The solution you must craft Oh, and there is but ...
13
votes
1answer
211 views

This Sudoku Park iS LIT!

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" The grid below is a normal Sudoku grid with normal Sudoku clues, but the completed grid also houses a Statue Park! The completed ...
1
vote
1answer
71 views

Why is 'logjam' the answer to 'function held up by traffic blockage'?

Why is 'logjam' the answer to 'function held up by traffic blockage'? I guess 'log' is function, and logjam is blockage but why 'jam/maj'? L,G & A are all correct.
12
votes
1answer
204 views

Sudoku: Odd Bonds

An entry in Fortnightly Topic Challenge #47: Wacky Sudokus. Edit: Clarified three of the rules. Rules: Normal sudoku rules apply. Inside the sudoku, there exists one "loop". The loop ...
-2
votes
1answer
92 views

Heptagon, nonagon

What is the trick to constructing a heptagon and a nonagon which have all their sides equal? The length of the side has to be a natural number. Your answer should include a drawing of the two polygons....
1
vote
0answers
93 views

Help with a program to solve Einstein's Riddle

I have been trying to write a program (just for fun) to solve Einstein’s Riddle, see https://play.google.com/store/apps/details?id=com.rottzgames.logic. My solution basically does this: It creates an ...
6
votes
2answers
158 views

Cutting a shape into two equal area shapes

Given the following shape - an hexagon ABCDEF of which a parallelogram CDGH is cut out. With a single cut divide the shape into two equal area shapes by means of an unmarked . You may draw lines and ...
9
votes
1answer
196 views

A Fractal Sudoku - SS#13

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the penultimate puzzle in this series! For more information about the series, see the ...
13
votes
1answer
246 views

A No Sensa Test Question with Mediterranean Flavor

Which of the three options fit in the central Octagon which is common to the two diagonals, one vertical and one horizontal row? Separately, each diagonal row (Brown and Red boxes), the horizontal row ...
4
votes
1answer
110 views

Identifying the wooden puzzle-box featured in Tomb Raider

In the film Tomb Raider (2018) there is a wooden puzzle-box with rotating sections. Once the correct sequence of moves is performed, a drawer pops out. See here: Upon seeing it she says: Karakuri. ...
0
votes
3answers
80 views

5x5 grid with no tetrominoes containing repeating colors

Paint the cells of a 5x5 grid with 𝑛 colors, such that every possible tetromino found in the grid uses 4 different colors. What is the smallest value of 𝑛 possible in such a coloring? Here is a ...
3
votes
3answers
333 views

4x4 grid with no trominoes containing repeating colors

Paint the cells of a 4x4 grid with 𝑛 colors, such that every possible tromino found in the grid uses 3 different colors. What is the smallest value of 𝑛 possible in such a coloring?
1
vote
0answers
106 views

Men of the past

J.R.R. wrote about the dragon, thinking of these men. Issur performed and challenged the locals to do a crossing, thinking of these men. G.R.R. wrote about the killer of the giant, thinking of these ...
2
votes
2answers
86 views

A number built with two-digit primes

What is the largest number, which can built as a sequence (from left to right) of different two-digit primes only? For example, 1371731 is valid, 137131 is invalid (containing 13 twice), 139717 is ...
6
votes
1answer
147 views

Logic grid puzzle - Carson City Chronicle

I can't figure this one out. Any help would be appreciated. Journalist-in-training Janet Seymour's byline appeared in the Carson City Chronicle on six days last week. On each day (Monday through ...
9
votes
1answer
417 views

Sudoku with no grid and no numbers!!? - SS#12

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

A full cryptic crossword

Eight clues are thematic and are clued by word-play only. Each of these eight clues' word-play has an extra letter which is not part of the answer. These letters cryptically indicate something, ...
20
votes
1answer
885 views

Sudoku in Technicolor!

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" This puzzle consists of three overlapping Sudokus, coloured red, blue and green, so each cell will contain three digits, one of ...
15
votes
2answers
2k views

Hotaru Beam Puzzle: Is it impossible?

I saw this puzzle on Twitter by user @lilva_0419 and I personally feel that it is impossible to solve. Can you prove me wrong (or right)? Source on Twitter Try it online Rules (see Wikipedia): ...
1
vote
2answers
140 views

How to solve this 3x3 dots and lines puzzle?

I saw this on a forum and no one knows how to solve it, and it's driving me crazy. Does anyone know what the solution is and why? I tried looking at similarities in the columns, rows, and diagonals. I ...
6
votes
1answer
616 views

Finding the median of 5 numbers

There are 5 boxes labeled A, B, C, D and E. Each box contains a distinct number, but you don't know what it is. You can select three boxes and the Oracle will tell you which box contains the median* ...
0
votes
1answer
91 views

10X10 Sudoku with a specific requirement

Let's have a 10x10 grid. We want to create a Sudoku in which, in each row, the pairs (a+b), (c+d), (e+f), (g+h), (i+j) add to one of the following numbers: 7, 9, 11, 13, or 15. Can you construct a ...
6
votes
3answers
520 views

Table of mathematical expressions - fill in 1-9

Fill in the numbers 1 through 9 in the 9 empty cells (each number appears exactly once) to make the row and column expressions equal to the number at the end of the row or column. Regular math ...
4
votes
1answer
124 views

What is this puzzle with identical wooden pieces?

I received a bag of wooden pieces, but cannot figure out what the puzzle is supposed to be. I've tried several burr options and several Alketruse puzzles, but cannot find the correct configuration. ...
3
votes
2answers
76 views

A triangle inside a triangle

All sides of a triangle T1 are shorter than the shortest side of a triangle T2. Is it always possible to put triangle T1 completely inside triangle T2?
7
votes
1answer
87 views

This Sudoku takes a step up! - SS#11

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

math quiz question to be a math teacher [closed]

If I have a multiple choice question where $\int_ {e} ^ {2e} \frac {x} {\ln(x)} dx $ is equal to: a) 6.55... b) 7.28... c) 7.93... d) 7.96... e) 8.10... f) 10.10... the ... means that there is ...
-1
votes
1answer
84 views

Gaby's 21 students sitting around a circle [closed]

Gaby numbers her 21 students with the primes between 11 and 97. She now asks them to sit around a circle making sure that any two of them sitting next to each other have either their tens or units ...
3
votes
5answers
489 views

Ma turned 34 in 2002. Really?

My friend said to me: “In February of the year 1970 at 1:12 AM Ma turned 18. Ma turned 34 in February of the year 2002 at 2:16 AM. How is this possible?” “And yes. Same Ma!” he ended with that. Hint ...
-3
votes
1answer
226 views

Gold coins robbery [closed]

I am posting an interesting problem which I find in my local magazine named 'Dainik Bhaskar' in the riddles section. At first sight, I think this will be an easy one. But I am wrong. Can anyone help ...
0
votes
0answers
41 views

An orderly transition of power [duplicate]

Since it's the 20th of January, perhaps we can demonstrate an orderly transition from TRUMP to BIDEN? There are eight steps to get there and all words are found in the World Scrabble dictionary. One ...
11
votes
2answers
149 views

An artistic trip

Here are 6 places I visited in 2008: Now tell me, where was the Sun?
-4
votes
1answer
85 views

How to open the lock from this safe?

The puzzle is as follows: The figure from below shows a lock mechanism used to store sensitive data microfilms from a certain lab. This mechanism is magnetic and consists in numbered buttons which ...
-4
votes
0answers
61 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
90 views

What do these three towns have in common?

What do these three towns have in common? "Dublin", "Blackpool", "Chernobyl".
3
votes
2answers
435 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 ...
6
votes
1answer
172 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?
4
votes
4answers
344 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 ...
6
votes
2answers
250 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}...
3
votes
2answers
344 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?
-4
votes
2answers
64 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 54. Can anyone help me? P. S. You can use +, -, ÷, x, ! And ...
4
votes
2answers
1k 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 ...
37
votes
1answer
1k 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
2answers
246 views

Black board attack

How should Black move as to attack all the squares that have no piece on them with only ten legal moves for black? Any unoccupied squares must be attacked. Start from the position above as shown.
-2
votes
0answers
141 views

As seen in a dream

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