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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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### 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 ...
19k 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, ...
9k views

### Fwd: Re: Karen is missing!

From: Ada Hughes <ahughes@fib.gov> Sent: Thursday, April 7, 2016 7:03 PM To: Joe Dorsen <jdorsen@fib.gov> CC: Jason Bernz <jbernz@fib.gov>; IT Guys <cis@fib.gov> Subject: Re: ...
8k views

### What famous line does this Linux command line represent?

The following shows a Linux command line with a # prompt: ...
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) /...
7k 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. ...
16k 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 ...
4k views

### What famous dialogue does this Java code represent?

The following is a text rebus in the form of Java code: ...
3k views

...
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 ...
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 ...
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 ...
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 (...
4k views

### Chuck Norris vs. This Question

public var c: = Infinity; public var w:Array = [,<...
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 ...
8k 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, ...
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 ...
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. ...
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 ...
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 ...
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 ...
1k 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 ...
2k views

### Little bits of food

You will come across a question. Answer it.
9k 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 ...
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? ...
9k 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 ...
2k views

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 ...
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 ...
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 ...
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, ...
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 ...
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 ...
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 ...
553 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 ...
7k 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, ...
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 ...
812 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, ...
828 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, ...
6k views

### Another idiom for computer programmers

One of my (many) mottos: ...
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 ...
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 ...
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 ...
609 views
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### Old code for the new year

Here is a question I posted on rec.puzzles back in 1998. So it's about twenty years on, and people seem to have stopped thinking about it. I'll refresh your memory by posting it again: I wrote a ...
812 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.
1k views

### The Prison Escape Pt. 1 (THE DOOR)

You are currently escaping a prison owned by a mad scientist. As you were about to approach a large iron door that you think should be leading to the exit, a guard came out from the shadows. ...
2k views

### The great puzzle

Someone one was trying to find out something, according to the following UNIX commands. ...
481 views

### Ornithogenic Turnover

Peptiberg: Hello, friend. Why do you look so pleased? Tippgeber: My friend just had a change of profession - from a divisive one to a constructive one. Peptiberg: Was it a smooth transition? ...
842 views

### Oh no! A hacker has taken control of my computer!

It seems that some guy called Magick has taken over my computer. Well, there does not seem to be any harmful stuff done at least, but this picture keeps appearing on my screen. "HACKED by Magick"? ...