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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?
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1answer
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)...
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0answers
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 ...
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0answers
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@...
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0answers
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 ...
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0answers
767 views

Spanish rebus puzzle

I need help in solving this picture riddle in Spanish language.
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0answers
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 ...
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0answers
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 ...
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0answers
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. ...
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0answers
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. <...
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0answers
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 ...
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0answers
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.
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0answers
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 ...
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1answer
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 ...
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0answers
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 ...
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0answers
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 ...
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1answer
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/...
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0answers
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.
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0answers
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 ...
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0answers
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 ...
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0answers
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 ...
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0answers
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, ...
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0answers
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:
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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 ...
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0answers
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 ...
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0answers
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!
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0answers
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 ...
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0answers
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 ...
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0answers
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 ...
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0answers
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 - ...
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0answers
570 views

IQ matrix type question

what one should fill in the bottom right square?
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1answer
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@...
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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 ...
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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 ...
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148 views

Answer is an English word

Hint: Scheduling Conflict From CS50x Puzzle Day.
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0answers
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 ...
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1answer
225 views

Tokyo Metro puzzle #4

Yet another Tokyo Metro puzzle based on the map! Puzzles 1, 2, and 3 are avaliable. Riddle: ...
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0answers
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 ...
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0answers
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 ...
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0answers
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 ...
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0answers
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 ...
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0answers
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: ...
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0answers
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? ...
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0answers
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 ...
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0answers
420 views

I was solving a story where there is a puzzle of the following

I was solving a story where there is a puzzle of the following... Can anyone help? There was the picture of Rod of Asclepius beside the alphabets, if this is any sort of clue. What can fit inside ...
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2answers
371 views

The next term is?

A sequence of integers between 0 and 9 is as follows: 5, 8, 1, 0, 1, 8, 6, 2, 4, ? What is the next term? Hint:

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