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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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212 votes
1 answer
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Lock your computer when you walk away!

Well this is strange. I forgot to lock my monitor when I walked away from my desk, at work, and one of my co-workers decided to have a little fun. When I got back, I found this little C# console ...
Khale_Kitha's user avatar
  • 8,442
201 votes
10 answers
22k views

Game of Life: Kill the Sun

Below is an initial state for Conway's Game of Life with a single pulsar. Living cells are white. The area marked with red is your base. You are free to modify any of the red cells, but only those, ...
BaSzAt's user avatar
  • 5,667
93 votes
6 answers
11k views

Fwd: Re: Karen is missing!

From: Ada Hughes <[email protected]> Sent: Thursday, April 7, 2016 7:03 PM To: Joe Dorsen <[email protected]> CC: Jason Bernz <[email protected]>; IT Guys <[email protected]> Subject: Re: ...
Khale_Kitha's user avatar
  • 8,442
82 votes
2 answers
9k views

What famous line does this Linux command line represent?

The following shows a Linux command line with a # prompt: ...
pacoverflow's user avatar
  • 15.2k
70 votes
6 answers
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) /...
2012rcampion's user avatar
  • 18.9k
69 votes
1 answer
2k views

Selective attention: an unusual game

There's a park behind the local basketball courts, where I like to go for quiet time. The other day, a group of thirty people arrived with a basketball as I was sitting down. One sat next to me, ...
Anon's user avatar
  • 5,430
64 votes
12 answers
26k views

XOR - Is it possible to get a, b, c from a⊕b, b⊕c, a⊕c?

Just got a simple question from a friend; still thinking. Let's share it! Is it possible to get a, b, c when you have a⊕b, b⊕c, a⊕c ? where ⊕ is the boolean ...
Jet's user avatar
  • 775
64 votes
5 answers
8k views

Game of Life: Move the Sun

Based on Game of Life: Kill the Sun Conditions are the same: Below is an initial state for Conway's Game of Life with a single pulsar. Living cells are white. The area marked with red is your base. ...
kamenf's user avatar
  • 6,506
57 votes
3 answers
3k views

Regular Expressions

...
Bass's user avatar
  • 77.7k
56 votes
1 answer
5k views

What famous dialogue does this Java code represent?

The following is a text rebus in the form of Java code: ...
pacoverflow's user avatar
  • 15.2k
53 votes
2 answers
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 ...
Tryth's user avatar
  • 14k
52 votes
8 answers
7k views

James Bond : No Access

James Bond, while working on a top-secret case for many weeks in deep enemy territory, finally collected and stored lots of critical files on his tight-security Linux system. Even though the system ...
Prem's user avatar
  • 5,162
42 votes
3 answers
1k views

The telltale code

The other night, while writing this Java class that could be serialized into a socket, I fell asleep and had a weird dream. In my dream, when I ran the program, the socket and the class object ...
KeyboardWielder's user avatar
40 votes
3 answers
2k views

What comes next in the sequence? (Counting sheep)

My roommate has insomnia so he was counting sheep to help him sleep. He started with 2986, then continued with 47786, 764586, and 12233386. What sequence is he following, and what was the next number?
DenverCoder1's user avatar
  • 10.5k
40 votes
4 answers
4k 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 ...
2012rcampion's user avatar
  • 18.9k
39 votes
4 answers
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 (...
Adnan's user avatar
  • 749
38 votes
1 answer
4k views

Chuck Norris vs. This Question

public var c: = Infinity; public var w:Array = [,<...
Chowzen's user avatar
  • 25.7k
37 votes
14 answers
6k views

Debugging with printf()

Bob, a C programmer and a believer of printf-debugging, gets hired by a failing software company. The company is not doing well because they adopt an archaic source code management system which does ...
user avatar
33 votes
25 answers
9k views

I shouldn't have asked him

My roommate (rm) always looks busy in front of his laptop, so I try to start talking to him Me : "Hey, You always look busy, so how do you entertain yourself? Do you have a favorite book, movie,...
malioboro's user avatar
  • 3,828
33 votes
2 answers
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 ...
Engineer Toast's user avatar
32 votes
3 answers
9k views

▉ ▎▊ ▐▎ ▋█ ▐▉ ▋█ ▐▉ ▎▊ ▐▎ ▎█ ▐

(I created this puzzle myself) I was shopping for groceries the other day, and I found an item that was in an unlabeled, uncolored package. In fact, the only thing that was on it was this barcode: ...
Sylvester is on codidact.com's user avatar
32 votes
3 answers
2k views

Mysterious Flash Drive

First puzzle I ever do! Hopefully it won't be too easy or too challenging. My co-worker just gave me a USB flash drive, which was supposed to contain a couple files of code for me to review. ...
NudgeNudge's user avatar
  • 6,105
31 votes
5 answers
2k views

The old tinkerer's safe

A client of mine died last Sunday - just as he was born on a Sunday. He was already at rather ripe age, and I had the pleasure to present his last will to his loving and caring family. As far as I ...
BmyGuest's user avatar
  • 18.2k
31 votes
2 answers
1k views

A Racing Heart!

This puzzle is about an athletic, hearty person. Therefore, there are 3 pieces of information hidden accordingly: For each clue, including trailing remarks such as "(2 words)", remove all numbers, ...
ffao's user avatar
  • 21.8k
31 votes
3 answers
10k views

What secret is this massive technical puzzle hiding? [riddles and data puzzles]

There's a game development company which released a mysterious "countdown to reveal" web page, and the page is designed pretty fancy, so everyone in that gaming community is curious about this. This ...
J.Todd's user avatar
  • 263
30 votes
6 answers
3k views

Five Linux command line rebus puzzles

Solve the following 5 text rebuses, which are in the form of Linux (bash) command lines. Rebus #1 (solved by Prem) # type beep sound > file.txt 2> file2.txt ...
pacoverflow's user avatar
  • 15.2k
30 votes
4 answers
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 ...
Jonathan Allan's user avatar
28 votes
1 answer
1k views

Code Movie Wall

An entry in Fortnightly Topic Challenge #36: Twisted Classics 1 I'm thinking of a movie. The Connecting Wall below (click it for a bigger version) should have made guessing the movie really simple, ...
Sleafar's user avatar
  • 18.1k
27 votes
2 answers
2k views

Little bits of food

You will come across a question. Answer it.
scholtes's user avatar
  • 415
27 votes
8 answers
2k views

Meatsacks, please help us decipher this code

Be greeted, meatsacks. We have been studying several of your species for some time now. One of the subjects, some meatsack related to saving Earth several times, seemed to know a lot of our operations ...
Sumurai8's user avatar
  • 720
27 votes
5 answers
2k views

What does this Java main() method represent?

The main() method in the following Java program is a text rebus. What does it represent? ...
pacoverflow's user avatar
  • 15.2k
27 votes
5 answers
2k views

Google cannot find me

Google cannot find me, reflected I'm lemon and lime, googling 'me' is when you fall, me and meme will answer all. What am I? Line 1 hint: Posted I still Line 2 hint: Take my reflection ...
Tom's user avatar
  • 70.9k
27 votes
14 answers
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, ...
KeyboardWielder's user avatar
27 votes
2 answers
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 ...
Sconibulus's user avatar
  • 19.7k
26 votes
1 answer
1k views

Self-Description

Part of the Fortnightly Topic Challenge #35: Restricted Title 1 This text has ? l's and ? n's, but its ?th most frequent letter is f. This text also has ? letters that are used ? times or less. Its ...
stacksfiller's user avatar
  • 10.6k
26 votes
2 answers
2k views

Death cases of computer technician

Police found the body of a computer technician in front of his computer, with a belly wound. There was a possibility of the victim bleeding to death after being stabbed with a sharp object. There were ...
nyongrand's user avatar
  • 506
26 votes
3 answers
1k views

The PSE School of Enigmatics (Part 1)

Update: I fixed up the second image, making it (perhaps) a little bit easier to crack. You leap out of your bed. Today's the day! You check your mailbox, and wow, there it is! The frayed look of the ...
Zerium's user avatar
  • 755
26 votes
1 answer
857 views

The life of a Knight: Conway style

So I was thinking about Conway's game of life and the ridiculous kinds of patterns that can be made (Things that move across infinite space etc) and then I thought, hey could a chess knight do this as ...
Going hamateur's user avatar
25 votes
9 answers
10k views

Computer riddle: I treat vars like D

Little 'bout my age: far from that of B Yet in my syntax, you will find some C The way I treat vars, that is much like D I do take objects, but I'm not like E If it starts with F, you'll know it's not ...
busukxuan's user avatar
  • 1,115
25 votes
3 answers
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 ...
user avatar
24 votes
2 answers
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 ...
Engineer Toast's user avatar
23 votes
6 answers
2k views

Ask me this, what's my job?

My friend was talking to me about his profession and what he did for a living and I was a bit confused about what it all entailed. When I finally got fed up and asked for clarification about what he ...
Sensoray's user avatar
  • 6,875
23 votes
3 answers
8k views

Wife can't figure out husband's secret account password

John and Jane are married and keep a joint account at ABC Bank. They agreed that all of their income should go into the joint account. In early 2014, John started a new job at a software company, ...
pacoverflow's user avatar
  • 15.2k
23 votes
2 answers
2k views

Regex crossword

I can't believe this old-but-gold piece hasn't been shared here. It's a regex crossword puzzle! Here's a nicely printable PDF. Kudos for this one goes to a competition held by MIT in 2013. The ...
Vilx-'s user avatar
  • 1,393
22 votes
4 answers
1k views

Consecutive integers around a circle

Find a block of positive consecutive integers that can be placed around a circle in some order so that any two adjacent numbers always have a common divisor greater than 1.
Bernardo Recamán Santos's user avatar
22 votes
3 answers
2k views

Down the Rabbit Hole

There's a secret hidden in the text below. What mind-blowing truth does it reveal? Not imaginative? Then Zeke's Clues may assist! Unsure, lad? With our patented Obscurity Clues, begin verifiably ...
Engineer Toast's user avatar
22 votes
1 answer
2k views

Pythonic Purity Puzzle

You are looking for a ten-letter word. Perfection is displayed not when there is nothing left to add, but when there is nothing left to take away. ...
Collisteru's user avatar
22 votes
2 answers
2k views

Who can spot the difference?

My family and I have just moved house! Lucky us! So what did my family do? We held a housewarming party, and rung everyone in the neighbourhood up to invite them. So, anyway, people were coming in ...
boboquack's user avatar
  • 22k
21 votes
2 answers
3k views

What is this mysterious image?

Recently, my friend who lives in Italy sent me an email. This was its contents: Hi, I've got some news which you should be happy about. But I've seen you around on Puzzling.SE, so I though I'd ...
user avatar
21 votes
2 answers
881 views

Away from the hub

Today I got a weird FaceTime call from teenage girl I didn't know. They must have dialled the wrong number, but I was too intrigued to hang up. Instead, I covered my camera and turned off the ...
boboquack's user avatar
  • 22k

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