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1answer
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Unsolved Mysteries: D'Agapeyeff cipher

The D'Agapeyeff cipher is an as-yet unbroken cipher that appears in the first edition of "Codes and Ciphers", an elementary book on cryptography published by the cryptographer Alexander D'Agapeyeff in ...
26
votes
0answers
10k views

The Beale Papers

The background to this one's given here. NB: These may not be a genuine cryptograms (current thinking is that these are gibberish); but I though it interesting to share these in case they're genuine /...
22
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0answers
486 views

Lost in Translation

You arrive on a foreign island, but upon heading to the local library, you find yourself unable to decipher the texts. You wonder what's caused this... ...
22
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0answers
1k views

Deus Ex crypto puzzle

There is an encrypted email in the recent Deus Ex: Mankind Divided game: From the game files, this appears to be the string: ...
21
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0answers
558 views

The First Gate: Why So Tense?

Greetings fellow puzzlers and puzzled alike! I’ve concocted a little puzzle for you all... Well little may be an understatement, but I'll come back to that. Before starting, you should know that the ...
21
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0answers
1k views

Is there a more efficient way to rotate the centre pieces on the Octo-Star?

I'm looking for a more efficient algorithm to rotate the center column of the Octo-Star puzzle 45 degrees. The situation below occurs when four properly-oriented edges are next to each other, ...
18
votes
0answers
732 views

Never Completed Game - Difficult Riddle

The seventeenth of the primes. Its twin is twentynine. Po. Let’s drive. Bye, Alfonsín. Add seven triangular. Sweet. It named the Valley. This riddle is taken from https://www.nevercompletedgame....
17
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0answers
1k views

Decrypting the Key

So I've been trying to solve this Riddle called "Phage is Spreading.." ...
16
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0answers
541 views

Secret message in a birthday email

A coworker sent this message around on his birthday. Apparently it has a secret message. Here is the exact email body: Good morning FakeCorp, I am turning 25 today so I'm offering loads of ...
15
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0answers
379 views

Wrap your head around this treasure hunt

You are participating in a treasure hunt, with the following instructions: X N F I I S + N I G B W P Tired sunrays ...
14
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0answers
409 views

She went… She stayed

In 1969, she went to Kazhakstan. She stayed $1$ year Then she went to Mongolia. She stayed $1$ year In 1971, she went to ...
14
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0answers
567 views

Alternate, complex potions puzzle from HP fanfic

A long narrow room. The entrance is blocked by purple flame, the path onward blocked by black flame. On a table, the only thing in the room, are two dozen potions in opaque bottles. Half green glass, ...
13
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0answers
377 views

What is a Richi 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 conforms to a special rule, I call it a Richi Word™. Use the ...
13
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0answers
428 views

Rethinking this series on the syllabus

I assigned each person in my class the task of creating a number-sequence, however, 4 of the guys I usually consider to be leaders came back with baffling results. Can you make sense of their work ...
12
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0answers
709 views

An enrypted clue for the police

A well known German drug dealer contacted his accomplice through an encrypted note. The police caught the accomplice during a drug deal and found the note in his backpack. Note: (For those who can't ...
12
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0answers
321 views

Determining the meaning of a challenge coin

I saw this rather cool looking challenge coin the other day, and I was wondering what the associated binary on the back of it means, as it isn't standard ASCII. I'd appreciate it if you all have any ...
12
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0answers
1k views

REALLY important days in history

@Z. Dailey asks a mathematical puzzle Important days in history... and to come! with a series of dates in years 1973, 1978, 1983, 1992, 2005. My puzzle asks the question: What is the previous date in ...
12
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0answers
1k views

How would this binary-ish code be translated?

...
11
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0answers
463 views

Excavation Study

Layer by layer, we continue our journey to the center. Excavation area (in order) Excavation plans Expect plenty of overlap! Answer is a thematic phrase. Text transcript of the excavation area (...
11
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0answers
164 views

McGraw said in grinning eerie manner

...
11
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0answers
239 views

Professor Annity’s invention

The following morning, I found my mentor, Professor Annity, busily cleaning up after what looked like a series of curious experiments. As I entered the lab, she fixed me with a familiar sort of ...
11
votes
1answer
272 views

A trip around the United States

My journey so far has taken me to the following cities in order: New York (where I started from), Baltimore, Cincinnati, Sioux City, Monroe (La.), and Columbus (Ga.). What's my next stop? Hint:
10
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0answers
126 views

The Majestic but Draconian Dinner

We are hosting a dinner party. Here is a list of things you can take: Hotdog Grapefruit Oreos Potato Salad Cheetos Utensils Katlyn Predator Drones Banana However,...
10
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0answers
244 views

Quantum tic tac toe strategy

Most of us learn tic tac toe early in our life. Also, it is easy to find an optimal strategy for playing. How about Quantum tic tac toe? What is the optimal strategy for playing it? Rules On a ...
10
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0answers
335 views

Recurring Meeting

The computer scientist's assistant is late at work once again, trying to once again decode their bosses directions for the day. Under meetings, the boss has listed only a single meeting: ...
10
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0answers
272 views

Stool to love - who am I?

Recently, I was walking to Genua, where I stumbled upon Ego. He told me some Gordas were chasing him. Now, I usually don't follow Ego's advice, but before I could doubt him I saw Rozel and Fozel ...
10
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0answers
252 views

What is a Macho 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 conforms to a special rule, I call it a Macho Word™. Use the ...
10
votes
0answers
893 views

Crack the pigeon code

Can you crack this message? It was discovered in a chimney in 2012 attached to a carrier pigeon and was most likely sent during the D-day invasions. The GCHQ was not able to crack it, even after ...
10
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0answers
402 views

Grandma's keynote

Found this note which is addressed To my grandma, in her chest Since she's passed now, here's my quest.. What tickled her interest? And who invited her as guest?
9
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0answers
407 views

What is a Trimpar Word™?

In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles. If a word conforms to a special rule, I call it a Trimpar Word™. Use the examples ...
8
votes
0answers
272 views

Rosetta's Stone

Another puzzle in the spirit of the Density™ puzzle. Fairly hard I suspect. Enjoy! Final Answer: (6, 7) Version for the color impaired here. Hint 1 Hint 2 Hint 3 Hint 4
8
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0answers
225 views

An Attempt at AV Puzzle

Here's another puzzle with visuals and sound. I hope you enjoy it! With Sound: https://youtu.be/yHkQdEu0QpA Static Image (the musical notes represent the music in the YouTube video): Hint 1 Hint 2
8
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0answers
247 views

Cryptic Puzzle for Puzzlers: PART II

You are a cryptanalyst who works for the US Army. You have been intercepting what is believed to be enemy spies' communiques. However, the documents are very normal looking: Good Morning, The lasagna ...
8
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0answers
160 views

The Flippin' Magician's 7-card Grand Finale

This question is a followup to this question by @ais523, which itself was a followup to this question by @Wen1now. After touring the globe to accolades when performing his 10-card trick and 8-card ...
8
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0answers
388 views

No time for an emperor

I'm one word, made from two parts. Before this clause, some people I asked. One thought it was time to take chances! Another left to go where the dance is. Because they were lateral and ...
8
votes
0answers
331 views

April Fool's Enigma

Every year, a famous French youtuber (e-penser) presents his enigma of April Fool, but this year, targeting specifically a group of people who have done particularly well last year, he raised the ...
8
votes
1answer
351 views

Riddle Number Four

Time for a more challenging encryption, seeing how riddle #3 was decrypted so easily. First, I must note that this encryption was inspired during a chess match I partook in. I call it the ENIGMA ...
8
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0answers
897 views

3D ring/rope wooden puzzle (Eureka) solution?

I have a Eureka 3d Puzzle Model G: On the box there are 3 puzzles: Remove the ring Remove the rope Move the ring to the other side I have found a solution to the first puzzle: but cannot ...
8
votes
0answers
455 views

Meteor strikes again

Part of a phone call: -...well why didn't you just say so? -It wasn't as easy as you thought, Jack. All the power lines here were destro--- -I know...It's not like we're living on a different ...
8
votes
1answer
569 views

Weird and complex puzzle that we need help with

So basically this is a complex deep web puzzle and we're pretty much stuck at it right now as we don't have any idea what this is about, any help will be aprreciated (the attached images are the ...
7
votes
2answers
323 views

What game am I?

Can you work out what game I am? (My original puzzle): Head hung low in… (5) - Best card of the deck (3) Written much by peer and shakes, often read for the love it makes (6) - Certainly not pretty ...
7
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0answers
393 views

Zed's Phone: Failure to Communicate

My friend Beto and I constantly buy things for one another. One day, he gave me a strange-looking phone and said it was my birthday gift (My birthday wouldn't be until 3 more months). He said he ...
7
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0answers
307 views

Is there another name for this puzzle? (Kyudoku, Nine Find)

Is there another name for this type of puzzle? I can only find two examples of it online: https://www.brainzilla.com/logic/kyudoku/ http://ninefind.com/ In the game you start with a 6x6 grid filled ...
7
votes
0answers
168 views

Forbidden Love: A tale of two kingdoms

Once upon a time there were two kingdoms (bluex and pinksus) separated by a wall of eternal war. The kings of these two kingdoms each had one son and one daughter. Their children sought to end the war ...
7
votes
0answers
233 views

What is a Freecell 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 conforms to a special rule, I call it a Freecell Word™. Use the ...
7
votes
0answers
201 views

An Unusual Amount Of Help

Another day, another helpmate to solve! Here's a really complicated one! The Black pawn on Black's first rank moves like a normal Black pawn. It's White to move first. Given that White moves to ...
7
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0answers
315 views

What causes these signs to follow this relation?

Can you find why does the below relation hold true? Hint 1 Hint 2
6
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0answers
56 views

My initials are MC

My initials are M.C. and know me please do; I'm related in essence to many a crew; My syllables count four, Same for vowels I'm sure; Now please decide which are false and are true: ...
6
votes
0answers
233 views

Looking for a kid's puzzle, cannot remember title

I'm looking for a kids' logical puzzle I saw in a Brazilian puzzle magazine several years ago. A farmer had a square farm with four houses and twelve trees and he wanted to divide it between his four ...
6
votes
0answers
172 views

Catching up to my foe

I had once made a piece of wonderful art Until then it had been a century's vain of work Spent inside those Russian winter days At last made in the early eighties But a friend of mine had recently ...

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