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239 votes
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This is important. I need you to listen…

(Thanks to f'' for the help in chat! He solved the majority of this puzzle - I just came in at the end.) Step 1: Crossword The crossword was solved by feelinferrety, Z. Dailey, and Sleafar: Step 2: ...
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  • 138k
115 votes

Secret Admirer Secret Message

Disclaimer: This is only posted in a half-serious manner because I was bored and looking for alternative decodings. The message was sent by: The first trap is the simple answer (given by Joe). If ...
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  • 6,524
89 votes

Who killed Tom?

There was no murder, the police officer is trying to set you up. (Possibly trying to prove that you would be ready to accuse someone of murder based on a garbled message on a computer.)
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  • 69k
86 votes
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Strange women and their strange ways of giving you phone numbers

Her name is Her phone number is Because The translated message is: Which, converted to plain text is: The result above Translating this, we get: These are the Which spells out the following: ...
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  • 1,307
85 votes
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Who killed Tom?

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  • 965
80 votes

Four boys are playing football and one of them breaks a window

Here's my interpretation. It's Let me tell you why. Observe this ==> hE iS thE CuLpriT? Now read the entire line. Now the teacher knows whom to inquire.
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  • 1,074
79 votes

Who killed Tom?

It's clearly Because Therefore As
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  • 2,037
77 votes
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⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀

This question has If you
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  • 138k
76 votes
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The needle in the network - find it!

I noticed that four of the nodes of the graph have a quarter missing, and each of those four is missing a different quarter. With this... Though many people might convert these numbers into letters ...
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  • 926
72 votes
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What was my wife trying to say?

This is Text input: output: It took me a while but when I finally got a result I was full of joy! Why was I happy?
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  • 1,600
71 votes
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Why did they close my riddle?

To solve this puzzle, note the key word in the text: If we employ this on each of the three parts of the puzzle text, we can get the following: So the reason your puzzle was closed is because it ...
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  • 98.1k
67 votes

Do you *really* know Stack Exchange?

More partial answer, work in progress: As noted in Rupert Morrish's answer: The hint: So if we decode the cipher text found above using that cipher and key, we get: So if we ROT-13 the remaining ...
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58 votes
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Secret Admirer Secret Message

He should ask out ...
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  • 5,715
53 votes
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Decipher this message for instructions to decipher this message

Let's solve this backwards as intended. Observe that every word ... Further, we can ... And indeed, ...
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51 votes
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Do you *really* know Stack Exchange?

Trevor Powell did most of the work in his answer. He ended up here: This requires two stages of interpretation. First: Alternatively: Then:
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50 votes
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A cipher for beginners

well,
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47 votes
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Break the subsitution cipher with a twist

Scroll to the end if you just want the answer. I give a detailed explanation of how I reached it. First, I hypothesized that the permutation has two cycles: one of length 9, and one length 17. The ...
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  • 23.6k
45 votes
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28 Minutes Later

The eight patient names 1: 2: 3: 4: 5: 6: 7: 8: Summary: And finally: Easter eggs / references:
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  • 138k
44 votes

What characteristics of a ciphertext can be indicators of a particular cipher?

I'll start with a few simple ones to get us rolling. Base64 has a 2/3 chance of requiring one or two trailing = signs - if you spot any of these, there's a very ...
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  • 5,715
44 votes

Who am I??? Wait, isn't this a sudoku?

Partial solution
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  • 9,542
44 votes
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Geography at the pixel level

Looks like Once all of the places are found,
44 votes
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Can you name the Country Code™?

The country code of Brazil is: This is because: For a full explanation for each country in the original list, see the following table:
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  • 98.1k
42 votes
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What does this modern art picture represent?

Here is an answer that decodes this image. Not being a programmer, I used ImageJ and Stegsolve to look at this file. Viewing with bit0 then bit1 provides these two images: Then continuing to toggle ...
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  • 8,855
42 votes
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The strange SMS

If you interpret each two-digit number as We can interpret the full string as: Which looks a lot like Interpreting the numbers in this way gives us the string Which, with spaces, says
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  • 16.9k
41 votes
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Decode the message enciphered in these symbols: ◳◰ ◓◨ ◨◧◕ ◎◌ ◱◯◱◯ ◍◌○ ◉◉ ◇◔◓◕ ◐►◓◒ ◒◑ ◈◑ ◆◆◓ ◉◉◉

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  • 644
40 votes
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Guide to Codes and Ciphers

This guide aims to explain various ciphers, help you understand how they work, and how to decode them with or without a key. This answer is currently being split into multiple posts to improve ...
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40 votes
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My Spying Girlfriend

The boss has encoded the numbers using: For example: The numbers are thus as follows: My contact @hagfy (real name unknown) has identified this as the highly-advanced ...and has used enhanced ...
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39 votes

Dot message on a Star Wars frisbee team

The dots and dashes are Morse Code as noticed by @Randal'thor When it is translated to text it reads as follows: These are As a bonus 'Fall MMXVI' is Roman numerals for which was the season and ...
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38 votes
Accepted

The Writing's on the Wall

Taking the lines with squares on them, we get this message: $(K(AK^T)^{-1}+E^TH^T(HKO((AO)^{-1}C^T+O^{-1}K^{-1}L^T)+T^T))^T+S$ Superscript T has a specific meaning: it's the transpose of a matrix. ...
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  • 33.3k

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