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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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 ...
14
votes
4answers
988 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'...
11
votes
1answer
420 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: ...
11
votes
1answer
582 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 ...
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 ...
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
987 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 ...
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
906 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 ...
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?
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 ...
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
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 ...
1
vote
1answer
1k views

Algorithm for solving the permutation puzzle Tricky Animals

I have developed a game called Tricky Animals where the goal is to reorder the animals in the right order with three permutations: $A = (1,2), X = (2,3,..,n-1), B = (n-1, n)$. The game can be played ...
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? ++[------>+<]>.++[->++<]>+.-[-->+<]>.....---[-->+++<]>-.+[--->++<]>+...+[--...
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 ...
5
votes
2answers
677 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 ...
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 ...
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 ...
26
votes
8answers
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 ...
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 ...
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 ...
1
vote
1answer
151 views

Can you help me figure out this band?

So, that super cool coworker of mine was impressed at how I got the password to the staff party. I didn't tell him I got help from you guys, though, so he's given me another challenge! Instead of his ...
11
votes
2answers
772 views

Determining Call Chain

There were 25 kids in a class and each kid had some best friends. To simplify the problem, let's call each kid by their initial name. Here is a list of each kid's best friends: ...
23
votes
1answer
549 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 ...
10
votes
1answer
632 views

Dragons: Myth or MathJax?

Ever use MathJax to display mathematical expressions?   Expressions related to fractals? Ever used it to display fractals themselves?!   The time has come. These fractals are based on the ...
5
votes
1answer
197 views

I expect it to be 57 sometime!

Which famous quote is this simple Java code representing? ...
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 ...
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 ...
-4
votes
1answer
266 views

What is the answer to the following puzzle? [closed]

Observe the following question carefully and answer accordingly. iVBORw0KGgoAAAANSUhEUgAAAA8AAAAPCAYAAAA71pVKAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsIAAA7CARUoSoAAAAAhSURBVDhPY3wro/...
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 ...
15
votes
3answers
1k views

For which numbers does the order of reversing their digits and squaring not matter?

This was a question made up by a friend who doesn't have SE. Let the function $r:\mathbb Z^+ \rightarrow \mathbb Z^+$ reverse the digits of a number (in base 10) that it is applied to. In addition, ...
-7
votes
2answers
522 views

A Maze of Colors

I'm back and I have another maze for you. This time it'll be an image with squares of color. Start at the yellow block and end at the red block, both of which are at the bottom border of the maze. ...
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,...
6
votes
2answers
502 views

MathJax re flex

MathJax mirror on the wall, what is the fairest code of all? Let’s find the minimal replacement for (replace this line) in the following MathJax code ...
8
votes
2answers
361 views

I will introduce you to my wife and children, what family am I?

My family is building trust (<>.<>) I have three meaningful children :3 Parents (mom/dad) always stay beside each children <3 However, I often change my children if I don't like them!...
2
votes
3answers
1k views

ᚫᛄ•ᛟᛋᚱ•ᛗᚣᛚᚩᚻ•ᚩᚫ•ᚳᚦᚷᚹ•ᚹᛚᚫ•ᛉ

This is the rune page which has been found on-line in May 2014 released by mysterious cyber group. It consist ciphered text which is the hint to the included hash. Transcript: ᚫᛄ•ᛟᛋᚱ•ᛗᚣᛚᚩᚻ•ᚩᚫ•ᚳᚦᚷᚹ•...
9
votes
2answers
623 views

MathJax exposed

  WARNING   $ \color{red}{\boxed{\boxed{ \sf ~~{ \large N \, S \, F \, P \rlap{\small P\&CG~SE} }~~~ \huge\raise-.2ex\...
8
votes
1answer
959 views

What does this program try to tell?

I tried to open an non existent page on stackoverflow and received "Page Not Found" warning however didn't understand what the code next means. Do you know what SO try to tell?
2
votes
2answers
608 views

Can you help me understanding the Stones game?

I am trying to understand the Stones game stated here. The stones game is a simple game, it is also a very old game which is unknown to almost everyone. The game starts with N stones and M ...
13
votes
2answers
591 views

Help me find my friend!

I need your help! My friend has gone missing and I have no clue where he could be! However, he did manage to get a message out to me: Kidnapped. Send help. I am here: port town. $\left\lfloor\...
1
vote
11answers
2k views

Launching the missiles [closed]

The software for launching the missiles was designed so that both captain and co-captain had to press their LAUNCH button at the same time in order to trigger a ...
7
votes
2answers
561 views

Vacation Destination

So, a while ago I asked a friend to plan our next vacation. I had to tear him away from his computer and this site to get him to do anything. Which was probably my first mistake. I don't know if he is ...
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  ...