# All Questions

147 questions with no upvoted or accepted answers
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359 views

### Number sequence with two missing numbers 15, 39, 1/8, 1/49, 100, 11, _, _

Given the following incomplete number sequence: 15, 39, 1/8, 1/49, 100, 11, __, __ What are the two missing values?
352 views

### Minimising information to guess all hats correctly

There is a well known N logicians wearing hats of N colors puzzle: N logicians are wearing hats with numbers from 1 to N (each hat has one number; there can be multiple hats with the same number)...
350 views

### How many known distance-20 positions are found so far for the Rubik's cube in half-turn metrics?

This site says: "All 93,659,370 known distance-20 positions as of 18 March 2014 are available below." And in total there are about 490 millions of them. This information is 3 years old. Does anybody ...
318 views

### Solitaire cipher riddle

I am trying to solve this problem but with no clue of what it actually means. Only thing i know is that it is solitaire cipher hidden message/key. Here is the content of the image: To: root@...
306 views

### Cipher Puzzle posed to me by my friend

My friend recently sent me some puzzle, and it has me stumped. I'm not that good (garbage, actually) at cipher puzzles, so was hoping if anyone could help me out with it. It is.. "General O has ...
767 views

### Spanish rebus puzzle

I need help in solving this picture riddle in Spanish language.
183 views

### WITLESS Inscription 5

2 days ago, TheGreatEscaper had to take down Inscription 5 of WITLESS - A Puzzling Journey, due to (can you clarify TheGreatEscaper?) the lack of a solution. Can anyone think of a valid Inscription ...
180 views

### I Need Help Solving A Riddle - Its Just An Image?

So I was in this hackathon competition where they promised the people who placed in the top 3 a lot of money and then they delayed the results two weeks. Yesterday, when they were supposed to announce ...
182 views

### Numbers in this table?

I found this table, but can't seem to find any relation between the numbers. Also there is not much logic involved. ...
184 views

### Find the PSE user name

Hidden in the ciphertext below is a user name from puzzling.stack.exchange. Who is it? The intended answer uses all of the ciphertext, not just a snippet that happens to match somebody in some way. <...
76 views

### The Switchup-2.0

This question from last year (which in itself was anticipated on CSE two years prior) has a complete switchup of all non-pawn pieces on the board. The idea is to optimize the amount of moves needed to ...
210 views

### Need Help Solving A Riddle

Riddle: Hand on Top Hint 1: Hint 2: Hint 3: Hint 4: My friend ask me the question, not sure on the source.
146 views

### Sequence of close numbers

I just came up with the following sequence of numbers. 25 26 27 28 30 30 ... They all seem to be very close to one another... but what is the next number in the sequence? And what is the principle ...
366 views

### The Librarian's Labyrinth - Part III

"This Library is HUGE!," You say aloud. You hear your voice echoing through the halls and nothing else. How could this be? Who comes here? You start examining the books on the shelves. It's just your ...
229 views

### What’s the most discovered checkmates in one in a position?

Just another puzzle for fun! A discovered check is defined as “when a piece moves, while not giving check itself, as to let a piece behind deliver a check.” What’s the highest possible number of ...
86 views

### Filling a sudoku/latin square like array

Let us build a square array in the following manner, which I would like to call a modified sudoku: 1) Every row and column contains only one copy of a positive entry and there are exactly $t$ such ...
149 views

### Why did I create this table? Counting letter frequencies maybe

This is a real puzzle, in the sense that I'm puzzled by what I've found. I stumbled upon a google sheet in my google drive. https://docs.google.com/spreadsheets/d/...
108 views

### Are there any ways to make a good Cryptic rebus?

How do I make a good "Cryptic rebus"? Edit: It's a cryptic REBUS, not a text clue. Note: Look at the tags.
101 views

### I need help with this geocaching puzzle

There is a geocaching puzzle that hasn’t never been solved. It has a video that I will link below. Basically from the video you have to get a set of coordinates. There is a checker below that will say ...
215 views

### Help me save Christmas - clock and word puzzle

My friend created this puzzle, it tells the Grinch's plan to ruin Christmas. I need to derive the plan from the clocks I have counted that there are 60 words. The clue is that time doesn't go ...
108 views

### What are some tips to solve an environmental-based enigmatic puzzle (EBEP's)?

First, some rough definitions: enigmatic puzzle: a problem where the goal / answer should be well-defined (e.g. enter a certain word or phrase into an form which is accepted; find a clue to a ...
192 views

### Stuck trying to figure out a hidden message

As part of an ongoing "treasure hunt" in an online game that I take part in, there have been several forum posts made in an attempt to hint the participants to finding certain locations. However, ...
308 views

### I say something. You say “Thanks!”. I say “You're welcome”. What did I say at first?

Work with this: https://pastebin.com/esJCuQAg Clue 1: Clue 2: Clue 3:
139 views

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154 views

### How to choose a crossword grid

I have two clues whose surfaces run together very neatly (no relation between the answers). How do I go about choosing a grid so they appear next to each other? E.g. [Down clues] 4. Jay-Z is worried ...
214 views

### Decoding ciphertext with base64 yields obscure unicode

Context: I was given a piece of encrypted string to decipher and I have been stuck at it for a while. To not ruin the point of the problem, I will provide only some description of the text and my ...
252 views

### What's this message? It should be in italian

I received a challenge, deciphering "cgo feco a atm", the result, if a sentence, should be in Italian. I've tried the ceasar cipher without success, maybe you can help? Thanks!
214 views

### Finding all possible solutions of a japanese sums puzzle

I'm trying to think of an algorithm that gives out all possible solutions to a japanese sums puzzle. It's not an a college assignment or anything, I'm giving puzzles to my cousin for fun, but want to ...
436 views

### “IMYY4UECAPS↑(111…(1)…1)” Rebus

I was solving some puzzle where I got a password to crack and found hint of it as $IMYY4UECAPS\uparrow(111...(1)...1)\text{''}$ Some of the things i found out there is SPACE written in opposite ...
262 views

### Trying to solve Geocaching puzzle

I'm trying to solve this Geocaching puzzle. NZ NO PE KR AT AT PE AT UK MM SE Hint: Puzzle includes acting The answer to the puzzle should give some GPS coordinates, most likely in the ...
176 views

### Possible number based cipher… but which one?

Here's a sequence of numbers: 133, 173, 30, 133, 176, 160, 171, 63, 137, 176, 160, 60, 177 I'm sure they are an important part of a puzzle I'm trying to solve which I found hidden in an image - ...
570 views

### IQ matrix type question

what one should fill in the bottom right square?
298 views

### What is this e mail really saying

Veteran investigator Ken Smith had been following a suspicious e mail trail between John Jones and Robert Brooks.This particular one caught his attention. He was trying to figure it out. From: Jjones@...
144 views

### What is a TRUE Union Word™?

In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles. More specifically, this is an extended Word™ puzzle, built on the base of What Is a ...
62 views

### Distinct SemiPrimes with Close Factors

I'm in the midst of developing a game for several friends as a friendly competition. It begins with generating the largest distinct semiprime feasible with factors that closely related in length ...
148 views

### Answer is an English word

Hint: Scheduling Conflict From CS50x Puzzle Day.
87 views

### Help deciphering number cipher

21,14,01:15,03,01:19,11,10,10:02,15,18,01:21,15:05,01,13,03,11,21,01:21,14,15,21,01:19,14,15,21:21,15,19,21:19,01,05,01:09,05,15,08,01,03:09,03:04,01,07,21,14,21:21,21,11,03,20 9,10,13,1 we ...
225 views

### Tokyo Metro puzzle #4

Yet another Tokyo Metro puzzle based on the map! Puzzles 1, 2, and 3 are avaliable. Riddle: ...
143 views

### Solve it… Uncover the mystery!

One of my friend, who is really too good with cyphers and puzzles challenged me to solve this one. I think it reveals a name, or date or some information with which he can surprise his friends. That's ...
154 views

### Best strategy for Multiple Blindfolded 3x3 Rubik's Cube event (WCA)

The MBLD event is quite hard on the technique and the memory , testing the 3x3 Blindfolded method. The cube placement strategy as discussed by few officials stand at : Cube Placement The other ...
335 views

### Trying to de-code this and I'm having a lot of trouble

The code is: dsetg nvxgn abfus fcaur vvkyq llszs yybik pkefa vbyjj stalk aupoc dvyai qnlrj iewzb qfcct mgqrg xxuqy sapeb reahl btxbz wisfd klbqr letxa zhu I've run it through a bunch of ciphers ...
209 views

### How do I solve the first phase (corners) of the gear cube when only one corner is out of place?

I got a gear cube and started scrambling with wild abandon. Then I stopped and tried to solve it. I couldn't. I went online to watch YouTube videos. I learnt there are three phases involved in solving ...
805 views

### What Encoding Algorithm is this? Encode table included

Take the word "puzzle" for example. What this algorithm will do is first break it into pairs: pu zz le Translated using the encoding table: ...
195 views

### Riddle is boggling my mind

I really need help with this. Any ideas? I think it has something to do with 1D arrays, as per the hint at the bottom. 64x10 implies that there is some sort of table? ...
214 views

### AWS Quest - First Clue

AWS are hosting a puzzle hunt: https://aws.amazon.com/awsquest/ - the first clue is here: https://twitter.com/jeffbarr/status/972382654682120192 The only thing we have to Amazon Sphere is Sphere ...