Questions tagged [computer-puzzle]

A tag for puzzles dependent upon some degree of computer literacy - for instance, requiring basic familiarity with operating system usage, encryption or programming.

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7
votes
1answer
449 views

Reproduce output in picture using a logical input list by introducing a bug

I came across this picture and thought that this would be a fun programming puzzle to work out. (https://www.reddit.com/r/funny/comments/4hjf4y/ill_take_february_tickets_please) (Clearly, the ...
25
votes
14answers
2k views

The master programmer and the mystical reversal

The master programmer sat at his desk, gazing into the distance, his eyes seeing, and yet unseeing. The lunch had been heavy. His reverie was interrupted by the appearance of his close colleague, ...
22
votes
2answers
2k views

The Legend of Sally the Cow

I was looting exploring Pelagia Farm and I stole found this note in a locked chest on the ground. It seems that one of the farmhands had tried their hand at poetry. I want to know how it ends but some ...
13
votes
3answers
740 views

The Hyper-Modern Kidnapper: Crime Scene #5 (The last crime scene)

The Story: It had taken longer than planned to sneak out after having solved the word search with the hidden message. Vimes was worried that he had alrady failed. Having taken the stairs to reduce the ...
14
votes
4answers
989 views

Don't Be Afraid Of The Dark

This puzzle follows the convention that anything outside a quote is flavour text. So last night I left my computer running. You know - when computers get older they want to bend the rules a bit. Don'...
6
votes
2answers
706 views

The Hyper-Modern Kidnapper: Crime Scene #4

The Story: As soon as he read the message that Lipwig found, Sergeant Vimes raced home, sirens blaring for traffic to move aside. His daughter was home in her room. His daughter was home in her room. ...
32
votes
4answers
3k views

Multilayer Image Steganography

Alice, Bob, Carol, and Dan are playing a card game. After they all show their cards, Bob notes that by exchanging two cards the order of the players would be reversed; that is, the player with the ...
65
votes
6answers
5k views

Bar-coded Message (Reverse Engineering)

This weekend, while totally minding my own business and in no way being suspicious, I just happened to come across the following interesting document: Left page: download as TIFF (100,203,616 bytes) /...
8
votes
1answer
3k views

Creating a Kakuro puzzle with unique solution

I start with a grid of black and white cells. I randomly populate the white cells from numbers (1-9) using kakuro rules. Then I calculate the horizontal and vertical sums. I remove the numbers from ...
12
votes
3answers
2k views

Programming News Paper Puzzle

This puzzle appeared in my local paper, while I am unable to solve it - maybe you guys can take a crack at it. Page 1 Page 2 They were scanned at pretty high resolution, so you should be able to ...
18
votes
5answers
1k views

‘‘Loopy’’ C loop

What is the smallest number of non-space characters that can be added in order to change the following code into a complete C program that prints  ...
7
votes
2answers
548 views

MathJax: ones and zeros

Do or do not, there is no try.     — Yoda Here is another MathJax puzzle. The Starring MathJax puzzle involved handling numbers in MathJax, even though there are no count registers or ...
6
votes
1answer
407 views

What would Lincoln say?

I got asked this question on a job interview, I am not sure if this is a right place to ask but here it is: If Abraham Lincoln were to give an address today, what would he say about us? Hint: 63, ...
6
votes
1answer
256 views

She Lia Squared: Our daughter asked, “How many words can it make?”

For puzzle experts out there I'm certain this will seem trivial. Our daughter recently conned my wife and I into purchasing interlocking foam squares for her bedroom floor. On each square is a ...
49
votes
2answers
4k views

A Robot's Last Words

There, spread out all over the floor, were the mechanical pieces of a robot. Something had torn it apart, and the debris spanned a radius of a few meters. There was no sign of what might have caused ...
11
votes
1answer
224 views

Ode to Regular Expressions

Robert loves regular expressions and ever since his friend Jean introduced him to Regex Golf, he spends most of his time trying to find the shortest and most elegant solution possible. Robert is also ...
9
votes
3answers
750 views

Little bit of a code in binary :)

Decode it and prove it :) Share if you think someone else can solve it. Here is a little bit of a challenge for lovers of code and encryption, the hints should be evident, but I think that I would ...
3
votes
3answers
323 views

My component can be stricter than me

My component can be stricter than me. I'm used to read from not a wire, but a wave. You may use me where I'm used, an example is right in front of your eyes, and I am alive, though some parts have ...
7
votes
3answers
217 views

When is it worth using Hexadecimal over Decimal?

How many bits does a number need to have, to make it worth using hexadecimal notation of the form 0xHHH...H over its decimal representation of the form ...
0
votes
1answer
147 views

Find 5 digits, which have the most numbers of prime numbers [closed]

If we have to use all available digits once, We can form 9 prime numbers from (2,5,6,7,8), they are : (25867,28657,56827,65287,65827,82567,82657,85627,86257) With the same rule, find another 5 ...
16
votes
3answers
2k views

Clue 18 - Should this be on Stack Overflow?

<<---First clue <---Previous clue As you sit at the computer that you used to solve the last puzzle, a popup window opens. It appears to be a Stack Overflow question, with a very generic ...
39
votes
4answers
9k views

Who stole the bitcoins?

Introduction You want to give bitcoins to a person you have met. Part of the deal is to give the bitcoins in the most untraceable way. So you have decided to send an email to him with the address (...
30
votes
4answers
2k views

They've Noticed Your Puzzling Prowess

They came to your home in the early hours and whisked you away. The four by four's windows were completely blacked out but the agents seemed amicable enough, albeit fairly taciturn. After a while you ...
11
votes
1answer
423 views

Whatever it is, it should be in a museum

I have a friend who collects early computer technology. In fact, he's got a bunch of bizarre peripherals that probably should be in a museum instead. Some of this stuff is so esoteric that he's had to ...
2
votes
2answers
366 views

The Pattern-Bot

This is an entry into the 20th fortnightly topic challenge. Over the past few days, I have been receiving a series of strange emails. I wonder if you could tell me what they are: Email 1: Sender: ...
26
votes
2answers
2k views

The Prognosticator

As I traveled across the web, searching far and wide, I came across an odd puzzle that made me feel awry. It foretold the future's path and predicted no tie. How could this puzzle work, and what was ...
11
votes
1answer
583 views

What is a One-In-A-Million Number™?

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 number conforms to a special rule, I call it a One-In-A-Million ...
7
votes
1answer
1k views

One Very Odd Email

Yesterday, I received a very strange email from a friend of mine. It was originally very hard to read and dribbled with extra characters, but I believe this is relatively the original message. It ...
5
votes
1answer
252 views

Can You Find a Tower of Hanoi Word?

Consider a simple Tower of Hanoi set consisting of three rods and three disks. This tower has an optimal solution of seven moves; these seven moves are the only ones allowed in what follows. For the ...
10
votes
2answers
504 views

What does this C function do?

C source code at: http://pastebin.com/6Bywk5mf Will also function in Java. Note that in C ...
6
votes
2answers
225 views

It's my friend.. again

Yet again, my friend is back at it! Just today, I asked him for something, and he sent me a blank image, though I have a certain feeling it's not blank. You guys helped the last time, but can you ...
6
votes
2answers
2k views

I hope your internet's working

I'm new to this StackExchange - I'm more active on programming stack exchanges. So here's a computer-themed puzzle: 4K5L3RdR-PASTE Find the code (6 numbers) That'...
3
votes
1answer
989 views

Why is this Sudoku Skyscraper Failing?

I'm attempting to write a program that solves Sudoku puzzles using a variety of techniques. Up this point, I've only implemented naked singles and hidden singles (for rows and columns). I've been ...
8
votes
2answers
326 views

Count count count! if you can

How many pentagons are there in the shape below by filling the triangles as shows on the second graph? For example if this question was asked for the shape below on the left side, the result would be ...
0
votes
1answer
286 views

Crack the code (Java related)

I found a card of a company which must be several years old when cleaning my house. On this card, there is a riddle and I just can't figure it out. The code is the following: ...
11
votes
2answers
907 views

Can you figure out my favorite color?

I will start this puzzle with a review of my all time favorite book. This book is about architecture and city planning by authors who worked at a university. Here in the book, there are over 200 ...
5
votes
2answers
678 views

What is an Explosive 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 an Explosive Word™. Use ...
11
votes
2answers
876 views

How many bits in the Apple Logo? [closed]

Sorry in advance if this is a bit easy or if it breaks any rules, but it's the best I can think of. The Question: If there are 16 bits in a picture of an apple, how many bits in the Apple Logo?
23
votes
3answers
1k views

A weird website

So I recently stumbled upon a very strange website: There doesn't seem to be anything except a normal navigation-bar (which isn't working) and a cipher. Can you decrypt it? Maybe the plaintext will ...
1
vote
2answers
277 views

Find other swords down the waterfall

This is another old pattern I generated with a 1D cellular automaton: To me it looks like a sword hidden in a waterfall. The neighborhood of a cell looks like this: What is the rule behind this ...
1
vote
1answer
91 views

Who is the impostor?

C, the new head of a certain intelligence agency, is aware that there is an impostor hiding among the ranks. In order to find the impostor, he has decided to ask all field agents to immediately link ...
2
votes
1answer
792 views

Esoteric Programming Language

I need help deciphering this 'joke,' but I cannot figure out the primer/syntax. Does anyone recognize this? ++[------>+<]>.++[->++<]>+.-[-->+<]>.....---[-->+++<]>-.+[--->++<]>+...+[--...
6
votes
2answers
369 views

A conversation about logic gates

You are in a room with four buttons and a piece of paper. There is a weird dialogue about logic gates on the paper. Hello, my favorite logic gates are AND and NAND . I said Hello And he said ...
4
votes
1answer
222 views

MathJax minus 1

(This puzzle relies on familiarity with MathJax, the mathematics renderer that is automatically available for use in answers here at Puzzling Stack Exchange. Examples and more information can be found ...
-1
votes
2answers
370 views

Computer Crisis Takeover! [Part 3]

This is part 3 of a series of multiple parts about a takeover of all the computers on earth. The links to previous questions are here: Computer Crisis Takeover! [Part 1] Computer Crisis Takeover! [...
6
votes
1answer
200 views

MathJax looks kool

(This puzzle relies on familiarity with MathJax, the mathematics renderer that is automatically available for use in answers here at Puzzling Stack Exchange. Examples and more information can be found ...
7
votes
3answers
761 views

Starring MathJax

Twinkle, Twinkle, little star... Having enjoyed @Humn's recent MathJax puzzles (MathJax exposed and MathJax re-flex), I decided to contribute some of my own. This one is a classic $\rm\TeX$ exercise,...
7
votes
2answers
367 views

Stealing the bitcoins back

Introduction In the last challenge, you found out who stole the bitcoins. Now is the task to steal the bitcoins back. I didn't manage to steal them back so I'm going to give you the hints that I ...
31
votes
2answers
2k views

The Time Machine works but my friend is gone!

So my friend Fred and I have been developing a time machine. I know it sounds impossible but we think we've hit a breakthrough! Fred has had a successful test run but he didn't tell me where he was ...
1
vote
0answers
274 views

Image Recognition Riddle [closed]

Given this picture: And this picture: Could you solve the riddle? Nota bene: The mysterious dot prints below the letters are the UTF-8-encoded solutions (doubly encoded in the case of the ...