# All Questions

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### Identify the special one among 12 coins

We have 12 coins, and only 11 of them have the same mass. It can be assumed that all coins have identical appearances. We have a lever. How can we identify the special coin, by taking measurements ...
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### Puzzle on encoding of a word

In a certain code, AFZALPUR is written as BCBGYVOS. What is the code for FARIDKOT? As per my attempts so far, I cannot find a definite sequence of encoding. Both A and Z appear to be encoded to B, ...
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An entry for Fortnightly Topic Challenge #40, have fun with non-Chess puzzle! ;) Three young children: Red, Green, and Blue; were playing a classic game of Snakes and Ladders, when suddenly their mom ...
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### --> “virus.exe” <--

You have just arrived at work and walked to your cubicle, and after checking your emails, you are about to get started with your project, when you notice a strange new application on your desktop. ...
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### Create a 3x3 Magic Square that uses integers from -10 to -2

I've never used this before but i'm having trouble with this. Create a 3x3 Magic Square that uses integers from -10 to -2. By the way, this is a weird magic square since diagonals don't need to ...
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### Salesman's claim for mechanical keypad lock - 5 buttons and 545 combinations!

A company makes mechanical keypad locks. The keypad is a set of five buttons arranged vertically. O O O O O The buttons are quite close together. Once a ...
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### A Cryptic Dirty Dozen: Do your best!

Age a herb salad for a cat. (8) Wolfmother confused a shark. (6) Alias around the Spanish leader (5) The Colonel runs through that hibiscus patch (5) Ursine stench holds soothing plant ...
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### What does one do to decrypt this?

'Encrypted': 10101110001011101000000001110111000101011100011101110000000011101110100010111000111010111011100 Context: This is simpler than you think. So simple the solution to this problem would be ...
143 views

### A colorful glass circle

Entry into Fortnightly Topic Challenge #40 You've returned from your lunch break to a small package. Inside is a note that reads: Please come to my office at your earliest convenience. We have ...
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### What are some puzzles where it is difficult (for humans) to determine if there is a solution without trying to solve it

I'm looking for straightforward puzzle types where it is difficult to determine ahead of time whether or not there will be an solution to the puzzle (and therefore one must either try to solve it, or ...
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### What does a tick like in math? [on hold]

You have to think logically on this riddle; you may search anything you want.
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### Crime lords and valuables

Lost consciousness's rate of return is Spanish valuables in Swedish valuables. (5) The light side running a confused non-gay. (6) Stirring a Malay T for a grateful Spanish spirit. (6) Dear ...
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### Show me… “Stack the Logs!”

I'm Daniel, a skinny teenager from New Jersey. My mom got a new job, so she and I had to move to Canyon City, California. I decided that I needed a new hobby, so I started taking classes at the YMCA. ...
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### A Fairy Warped Chess Maze

So, my previous puzzle A Warped Chess Maze is somehow my highest voted puzzle on Puzzling SE. So, I'm bringing it back, now with fairy pieces! The fairy pieces will be explained in a bit, but the ...
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### Reconstruct a game of Loser Chess

In loser chess, the rules are the same as in classical chess but for the following points: The king behaves just as any normal piece and can be captured. There is no check, no checkmate, and the king ...
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### Can you help me out with this question? [on hold]

I found that 3abc+a+b+c formula is correct first and second triangle. But the result for third triangle isn't in the options. Can you find another solution? Source: It's from an old job admission ...
300 views

### Letter Rack 8x5 number 1

There is an 8-letter word in here, reading from top to bottom, picking one letter from each row. a b c d e t u v w x l m n o p d e f g h a b c d e i j k l m n o p q r t u v w x Can you ...
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### Reconstructing A Chess Game #4

My five years old pupil Magnus is really on fire ! After three wins in the first, second and third games, he is playing White today in round 4 against one of the tournament's favorites (a child who ...
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### Country and Its Capital

Five Managers - K, M, N, O and P - visited five Countries, F, A, B, G and K, such that each manager visited exactly four Countries. Further, each Country has a different capital city from among Merine,...
847 views

### A Classic Conundrum

I had a quick idea for a puzzle that may or may not be too hard to solve, but nothing is too hard for Puzzling SE so let's give it a go. One of my friends gave me a list of classic books to read last ...
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### Finding lightest and heaviest?

Given n > 1 items and a two pan balance scale with no weights, determine the lightest and the heaviest items in $\lceil 3n/2 \rceil − 2$ weighings. I tried splitting down the middle and picking one ...
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### Coin removal problem

I have a slight variation of the coin flipping problem. There is a line of $n$ coins on the table; some of them are heads up and the rest are tails up, in no particular order. The object of the ...
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### Homophone riddle 8

It feels like such a long time that I didn't post one... ...
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### A Quick Sudoklu

Across ...
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I finally tried my hand at a cryptic crossword. I don't really have any experience with cryptic crosswords, or crosswords for that matter so I probably broke like 300 rules. For example, 17 down is ...
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### Home city and Visited City

P, R, S, T, U and V are six colleagues who work for Fan Inc. headquartered at USA. Each of them lives in a different city that is one out of P, R, S, T, U and V, not necessarily in that order. Their ...
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### Three free moves, three more moves, mate

This morning, at the coffee corner in our office, I met a colleague who mentioned he'd be joining a chess club. So I asked him: "And, how was your first evening at the chess club?" "Well, it was a ...
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### Guess the letter in one question puzzle. It's a Relic [on hold]

I am thinking of one of the following five letters R E L I C You can ask me one question to guess which letter it is. Rules No question related to the number of the ...
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### Megan mated by a king move

"Been playing some chess with my husband recently", my friend Megan began, as we sat with our drinks in Coffee Monarchy. "How'd you get on?" I asked. "Didn't get off to a good start, I'm afraid. In ...
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### An Enigmatic Puzzle [on hold]

input: 3 2 1 1 9 7 2 0 5 9 output: 111222111 input: 2 2 9 9 8 7 output: 99999 Please help me understand the relationship main :
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### How would I flip an edge piece in a 3x3 without messing anything up except for flipping that one piece?

I am new to picture cubes and I want to know how to flip an edge piece on a picture cube 3x3 without messing anything else up. Like here from this: To this:
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### 5 subjects and their marks

The following partially-filled table shows the marks scored by 5 students named A, B, C, D and E in five different subjects, namely P, C, M, B and S. The marks scored by all students in all subjects ...
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### Riley 004 by KrOmega

It’s been a while since I’ve made a Riley, so here’s one: With my prefix you get the president, chairman, pope, Take away the infix’s end, or you’d easily be fooled. In the suffix I was mostly ...
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### please find the correlation between input data and output [on hold]

find the correlation between input and output. only a certain type of input is allowed and certain ouput is given
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### Is it fair to interlink clues?

Is it fair to link clues both ways? E.g. can I do: 1a. Local girl gives 8 (4, 4) 8d. 1 gives smooth head (5, 5) I'm quite libertarian. What could I get away ...
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### Number sequence 3

A friend of mine encountered a number sequence and I cannot figure out what the pattern is. What number replaced the question mark? 8 32 72 222 48 50 272 ??? ...
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### No moves at all, not even to put yourself in check

Here, white is stalemated. The king is not in check, but white has no legal moves. Not because any move white makes would put the king in check -- which is how stalemates normally happen -- but ...
103 views

### Converting the input (question) to the desired output (solution) [on hold]

Problem I need help determining the algorithm for converting the input (question) to the desired output (solution). Known Solved so far is the equals placement i.e. ...
128 views

### Who joined when?

An institute runs batches training students in C#. A new batch starts on the 1st of every month and every batch lasts for exactly 3 months (thus at any given time, the students of exactly 3 batches ...
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### This is simple: Just fill in the blank

Newspaper Headline Insect Researcher Carroll Appleton alongside grandson Adam discover underground wormhole networks. Recover ________ earthworms. Fill in the blank. Following are the choices ...
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### See me once, See me Twice #7

Here I am again, with another See me once riddle. Have fun! See me once, at the start of the week See me twice, the men becoming bleak See me once, when gambling on chinese ground See me ...
156 views

### The Research Paper

So, one of my friends is a teacher, and, for one of their recent assignments, one of the teacher's students turned in this: hkszocukgdxkcmvkuhgcskflfpnwebqhttbxhpwokywiyevvfohlgzqklw 6n1 ...
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### Named after something you'd find in a harbour

A big book of words was brought forth to my north. A prominent Turkish-born priest to my east. A bad taste was left in French mouths to my south. Criminals are put to the test to my west. ...
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### Teapot Riddle no.46 (fan made)

Teapot riddle rules: I have one word which has several (2 or more) meanings. Each of the meanings is a teapot (first, second ...) You try to figure out the word with my Hints First Hint: Second ...