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5
votes
0answers
40 views

Hey, This is a 100th Puzzle of Mine!

Yep, this is my 100th puzzle here in PSE~ I'm really having a wonderful time here, thank you so much guys! >< I planned to write a harder and bigger one, but it turned out I was too lazy to do that....
4
votes
2answers
58 views

Floor functional equation

Find all functions $f:\mathbb{R}\to\mathbb{R}$ satisfying the following functional equation: $$f(\lfloor x\rfloor y)=f(x)\lfloor f(y)\rfloor\quad\quad\text{for all }x,y\in\mathbb{R},$$ where $\lfloor\...
4
votes
1answer
54 views

A functional equation again!

Determine all functions $f:\mathbb{R}\rightarrow\mathbb{R}$ such that $$(x-2)f(y)+f\big(y+2f(x)\big)=f\big(x+yf(x)\big)$$ for all $x,y\in\mathbb{R}$. Source will be given after the problem is solved, ...
5
votes
1answer
80 views

Mathematical golfing

You have probably heard of code golfing? There the task is to find the shortest computer program that produces the required output. Here we want to perform math golfing - find the shortest formula ...
4
votes
0answers
96 views

What's the puzzle?

Someone sent me a photo of the last few lines of a puzzle. They were: BULLDOZER OVENPROOF BROADTAIL BREAKER ASYNTACTIC TIFF ALKYNE ABOUND EVASIVE BEVERAGE HILARITY COOTIE What ...
7
votes
1answer
72 views

Cut It Up! (then find a phrase)

This is a "sorry for messing up yesterday's clues" puzzle. For each shape below, divide along grid-lines into identical pieces (rotation and reflection allowed). The first shape has 3 pieces, and the ...
1
vote
0answers
57 views

Scrambler puzzle (CTF crypto problem by me!)

Before anyone starts hyperventilating, this is not part of an ongoing CTF! I just made this example CTF problem for fun... To learn more about what a CTF is, check out this Wikipedia page. For this ...
-1
votes
0answers
54 views

Deducing Puzzles [duplicate]

There are some puzzles , where it is very difficult to find the solutions and many will probably think that there are no solutions . But actually solutions are hidden as clues in the puzzles . Here ...
7
votes
1answer
246 views

120 degrees and circles

The bigger circle has a radius of $1$, and it is tangent to the two straight lines that forms an angle of $120$ degrees. The smaller circle is tangent to the two straight lines and the big circle. ...
4
votes
1answer
117 views

How to test a sudoku solver?

I have created a standard sudoku solver using my own algorithm. It relies on a continuous scanning with occasional tuple/pair searching. I am looking forward to test if this works properly. I have ...
7
votes
4answers
371 views

Take Two! (an Around-the-Bend)

Here's another around-the-bend. I felt like putting a hidden word in, but I couldn't think of anything good... there's still a word, though. Just unscramble the highlighted letters. Rules Each word ...
12
votes
3answers
864 views

Random walking on a board

There’s a pawn starting in the center of this game board. At each move, it can advance randomly towards any of the adjacent squares sharing a common side with equal chance. What’s the probability of ...
1
vote
1answer
145 views

A prolific nine-letter word

For the purpose of an arithmetical puzzle I am devising, I require a nine-letter legitimate (i.e. acceptable to Scrabble players) English word such that at least one permutation of all the letters of ...
3
votes
2answers
135 views

Hill cipher with 100x100 matrix?

Is it possible to decrypt/encrypt something using a Hill Cipher whose key matrix has a size of $100\times100$?
3
votes
1answer
75 views

Defeating the deleteriousness of time

What thing I'm talking about? Hint-1 Hint-2 Hint-3 Hint-4 Hint-5 (avoid)
9
votes
1answer
130 views

My First Riddle - What am I?

Amber, leather, fruit, or pine. Whiskey, crackers, never wine. White and red across a sea. Or clad twice in sable, burgundy. Hidden, swung, hooked, flown. Suited, bottled, jumping, thrown. You'll ...
13
votes
2answers
1k views

Triply English or Triply American

The following list of words divides evenly into two groups of words which I describe as Triply English and Triply American. American Assault Citation Common Count Diamond Fleet ...
9
votes
0answers
136 views

A fairy tale in a golden toy

Once upon a time, long long ago, in the days when good stories were far more beautiful and far harder to come by, a king was asked by his spoilt but beloved princess daughter to give her a fairy tale. ...
4
votes
3answers
301 views

Playing the Square Chess

On an ordinary chess board (8x8) without any pieces on it as a starting position, two players will alternately place a pawn on any square (unoccupied) so that the first player that form a square (...
4
votes
1answer
420 views

Everyone have me

Everyone have me; Without first two letters, I am not here; Without last two letters, I am a story; What am I?
27
votes
8answers
4k views

9-5=5? Matchstick problem

Move one matchstick to make an equality. Question made by me (Is this too easy?)
2
votes
2answers
84 views

Complete this cross sequence

What is the next element of this sequence and why? Possible choices:
4
votes
1answer
152 views

Not to mean no-brainer

What does this picture mean? What are meant by different component of this picture? What is indicated by the square inside the red bevelle? Answer need to contain explanation. Ps. I made the ...
7
votes
1answer
173 views

Three squares in a triangle

In a triangle, three identical squares of side lengths 2.8 share a common vertex and are each touching two sides of the triangle. If one of the angles in the triangle is 75 degrees and is opposed to a ...
4
votes
1answer
231 views

Murder on the Fairway

A body has been found at the Green Estates Fairway. Next to the body was a bloody golf club which was later confirmed by the medical examiner to be the murder weapon. Thankfully, only ten men ...
3
votes
1answer
117 views

Raven Matrix-like tests

I have some Raven test that I couldn't find the answers Hope you can find the answers. I found this test in this IQ Test application.
7
votes
2answers
633 views

A Covid-19 puzzle: Alcohol for your School!

You are the principal of a primary school in HK. Schools are resuming soon, and you have to ensure that your school have enough alcohol. Each of the 30 classrooms should have a bottle containing 500mL ...
15
votes
4answers
1k views

Creating the hardest 10x10 maze

You are given an empty 10x10 grid. You are allowed to paint some of its cells as walls (black), while the remaining cells stay empty (white). A robot is programmed to start in the top-left corner of ...
4
votes
1answer
194 views

One code to rule them all

Kurt, our crusty old mainframe admin, finally retired last week and I've been given the task of sorting through his files. Most of the files were comprehensible, if not understandable, like his old ~/....
7
votes
1answer
112 views

Cryptic Family Reunion: Numbers (fan-made)

The answers to the following cryptic clues all belong to a certain group. The definition part of each clue has been replaced by a number. Another number, hidden in the puzzle, gives a hint toward ...
-1
votes
0answers
104 views

string operations puzzle [closed]

You are given two strings A and B, each with length N. Let's index the characters in each string from 0 ― for each i ( 0 ≤ i< N), the i+1-th characters of A and B are denoted by Ai and Bi ...
0
votes
0answers
64 views

Stuck on a riddle that uses Base64! [closed]

I'm stumped on this puzzle! Here is a link to a Google Spreadsheets that gives you information! https://docs.google.com/spreadsheets/d/1ffxFgNtpbfhNELp8z9fv1R6Uc02BmBeR6cUG3EKXehw/edit#gid=0
0
votes
1answer
92 views

Stuck with sudoku

Stuck with this for long time now, applied all the techniques i can think of Blank: All possibilities: missed 6 as possibility in R8C5 Verified that this has unique solution
9
votes
3answers
584 views

Knight and Knaves Castle

I was pretty bored in the lockdown so I thought up a mathematics puzzle, which I haven's solved yet, so the community can solve together. Let $n>1$ be a positive integer. There is a square ...
8
votes
2answers
178 views

A knight chased by four knights

This is a follow up to A knight chased by three knights Two players are playing a variant of chess on a 11x11 grid. The first player controls a white knight that starts in the centre square. The ...
10
votes
3answers
663 views

A knight chased by three knights

Two players are playing a variant of chess on a 8x8 grid. The first player controls a white knight that starts in the top-left corner. The second player controls three black knights that start in the ...
3
votes
0answers
72 views

Homeworlds: War Games

Here's my second Homeworlds problem! (My first was Homeworlds: Mini Doomsday Machine.) ...
2
votes
0answers
109 views

The cryptic treasure hunt

I created this puzzle. This may be really challenging. But I assure you that there is a solid logic behind. (Note: Questions are cryptic) 1: Ucbemfol.jcancyf 2: Mwamebyr;assdpwhbporcrof; File 3: ...
16
votes
1answer
173 views

Where did I go on this trip?

I went on a trip yesterday. However I can't quite remember where I went. All I have is my diary entry for yesterday, but I'm struggling to make out where it was I went still. Maybe you can help? ...
3
votes
1answer
114 views

demystify and paint me!

To demystify me, look and say. Then paint me not with colors but with array. ...
16
votes
1answer
195 views

Fun with Flags part 10: don't lose count

In a Formula 1 race, the chequered flag was waved so violently that the black and white patches got mixed up. Who was waving the flag, when and where? Other (independently solvable) puzzles of this ...
3
votes
0answers
124 views

The obscure message

I created this puzzle. Find the message. q螣 s䈚 q蟝 v쀎 q蟾 q蠸 q襪 q褰 q弧 q螣 q襪 q蛡 q袈 q蟝 Hint 1: Hint 2: My other puzzles can be found here.
10
votes
1answer
138 views

Equipped for sailing

Grid in plaintext Across 1/13/20. State of Colorado engaged in attempt to pursue mostly American parties, often involving heroin (10,8,2,3,5) 10. "Terminal engineer, too, must… (7) 11. …ultimately ...
11
votes
4answers
591 views

A mouse and a maze on a n x n grid

I went back in an old Flash game and was intrigued by this problem. Rules There is an $n\times n$ grid and a mouse entering on the entrance cell and exiting on the exit cell. The entrance ...
1
vote
0answers
79 views

Missing number in a set of four segment circles

This is a puzzle posted on a social networking site that I have been trying hard since yesterday to solve: My approach has been to find out a mathematical function with the numbers in the yellow, ...
4
votes
2answers
222 views

Creating the hardest 7x7 maze

This puzzle is based on Creating the hardest 6x6 maze You are given an empty 7x7 grid. You are allowed to paint some of its cells as walls (black), while the remaining cells stay empty (white). A ...
4
votes
1answer
59 views

Cryptic Family Reunion #9

The answer to this puzzle is a list of ten thematically related words or proper names or phrases. Each of these is clued cryptically, and the theme is to be determined. Since the definition part of a ...
0
votes
1answer
81 views

Matrix Pattern matching Puzzle

This puzzle is part of the openly available questions from a book. I'm trying to solve it, but cannot find any solution to it. The book inside preview says the answer is top right one (two solid ...
11
votes
3answers
242 views

EDUCATION becomes a pandigital number

Each of the letters of the word EDUCATION is assigned a different integer value between 1 and 9, for a total value for the word of 45. With the same value for each of the letters, the total values of ...
5
votes
1answer
96 views

What is a 21 + 3113 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 adheres to a certain rule I call it a 21 + 3113 Word™. Text-...

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