Unanswered Questions
39
votes
1answer
3k views
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 ...
24
votes
0answers
696 views
R.H.P.C. crossword puzzle
This is an entry into the Fortnightly Topic Challenge #36
I got a ticket to the Red Herring Puzzle Club in the middle of the street. There was just a guy giving them out, like some advertisement ...
21
votes
0answers
3k views
Binary cryptogram from a friend
My friend sent me a "puzzle" in binary, and said that there are multiple steps to solving the puzzle, all of them including decryption. I translated the binary into text and he said that was a good ...
18
votes
0answers
969 views
One 'double agent' two-step on a waltzing floor
I'm in a jam – cornered I am! –
No clue 'bout where to go
Here's what went down, a pretty gown
Some wine, a French chateau
She whispered underneath her breath
"Come dance with me and ...
17
votes
0answers
334 views
With Apologies to Robert Frost
I heard this from an elderly German gentleman with a strong accent. At first I thought he was reciting a Robert Frost poem, but then the last line confused me.
Some see de earth vill end times four,...
16
votes
0answers
2k views
The Beale Papers
The background to this one's given here: http://www.damninteresting.com/89-263-201-500-337-480/
NB: These may not be a genuine cryptograms (current thinking is that these are gibberish); but I though ...
15
votes
1answer
699 views
An Alien Message
A spacecraft was found orbiting earth. It was not made by us, but appears to be intended to be received by us. This is a transcription of the engraving on one of its many panels:
Some of the symbols ...
13
votes
0answers
807 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:
...
12
votes
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, ...
11
votes
0answers
936 views
You don't need any hints
One enigma in trying to develop entertaining puzzles: Is it better for it the challenge to be very obvious and bubblegum? Maybe it should attempt to be virtually inconceivable? It is certain: A blend ...
10
votes
1answer
278 views
What a weird final exam
someday, some math teacher decided to test the logic deduction capacity of the class consists of 32 students. When the class began, he showed a letter to each student between A to E and said:
"There ...
10
votes
0answers
513 views
BFTIODFTTWKBCSC
This is my first self-developed cryptographic puzzle. I hope it is neither too hard nor too easy for you to break, and that you enjoy it. Please do not only post the answer, but also your way towards ...
9
votes
1answer
101 views
Solemn, Unhurried Enigma
Scan me, seeking hidden worth.
Uncover prizes, gems unearth.
Envision! Witness! Look and find!
Make mazes, paths. Unmask, unwind.
Any means and any acts.
Investigate wild wacky facts.
...
9
votes
0answers
796 views
8
votes
0answers
308 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, ...
