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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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 ...
11
votes
1answer
228 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 ...
7
votes
3answers
218 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 ...
20
votes
4answers
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. ...
10
votes
3answers
820 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 ...
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 ...
14
votes
4answers
1k 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
458 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
372 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
596 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
267 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
506 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
227 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
1k 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
295 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
911 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
878 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
805 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
689 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
375 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
224 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
202 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
374 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
281 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
155 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
774 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
557 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
670 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
441 views

Scratch your mind, who am I?

Scratch your mind, You will get stuck if you forgot me :( Try to make a cute wink by combining curve with me I can destroy your whole day if you missed me, and you finally found devil OMG!! Is 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
551 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
324 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
270 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
536 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
790 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
505 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
362 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!...
3
votes
3answers
2k 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•...