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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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Internet Problem Solving Contest 2017 - Problem M

I was practising interesting problems from past problem solving contests when I found this one. I guess that I should find some hash functions to find the candidates and check them by hand. I tried ...
Tutan Kamon's user avatar
11 votes
2 answers
1k views

Today is a prime!

Today, 20240603 already in some parts of the world, is a prime number. Just twenty-one other dates during 2024 are also primes. In what year will there be none?
Bernardo Recamán Santos's user avatar
5 votes
2 answers
499 views

Rubik's Cube with no two squares of the same color on any horizontal, vertical or diagonal line

Consider the 12 lines depicted below which all run through the centers of the 9 color squares of a single face of Rubik's Cube. Can you find a scramble such that on each line all squares have ...
Herbert Kociemba's user avatar
7 votes
1 answer
316 views

Weird Programming Glitch

Yesterday, when I was programming, my computer suddenly crashed. When I rebooted, I saw the message flicker before me: ...
Sny's user avatar
  • 3,185
13 votes
3 answers
422 views

a11eN756e64657261747461636b

Note: if it isn't obvious, none of the below or any of the decrypted message are intended to be real. C:\TopSecret\vacant\alien_transmission.jpg: ...
Sny's user avatar
  • 3,185
3 votes
3 answers
271 views

All poker hands from a single deck

This question suggested itself to me – and I found a solution – after I solved Can you balance this poker deck?. Take out two aces from the standard 52-card deck. Your challenge is to partition the ...
Parcly Taxel's user avatar
  • 7,820
10 votes
1 answer
470 views

What Language Is This?

It is the year 2204, and we have finally found intelligent extraterrestrial life. We are delighted about this, so we asked the aliens, ...
3-1-4-One-Five's user avatar
1 vote
1 answer
207 views

Maximum filled days

I have two types of items, $i_1$ and $i_2$. $i_1$ items can be used at most $50$ times and $i_2$ items can be used at most $120$ times. I have $7000$ items $i_1$ and $800$ items $i_2$. Each item $i\in ...
JKHA's user avatar
  • 6,135
12 votes
1 answer
1k views

So, where am I going now?

First there was nothing and my head began, I've sent my messages, finished and ran I've sent out my stuff, but where is it? Okay, I've got it, but ring the bell And step back one and play your guitar ...
3-1-4-One-Five's user avatar
-5 votes
1 answer
424 views

Which country am I from?

Which country am I from? You have all the information you need inside the following picture. Hint:
Sny's user avatar
  • 3,185
9 votes
2 answers
1k views

magic square operations

Fill in the grid with the numbers $1$ to $6$ so that each number appears exactly once in each row and column. A horizontal gray line marks any cell when it is the middle cell of the three consecutive ...
godlification's user avatar
11 votes
1 answer
522 views

Home improvement for my travel agent

"Howdy, howdy! Thanks for painting my kitchen for me." "No problem Pat. The offer of a free vacation is definitely a sweetener. Where were you going to send me?" "It's a great ...
Jeremy Dover's user avatar
  • 28.8k
5 votes
1 answer
378 views

Python Conundrum 3: A Dwarven Vault

Python Conundrum: The Series. While exploring an abandoned dwarven fortress, your party notices a faint glow on the wall. You put your torch on the wall and decide to look around: A massive stone ...
web adventurer's user avatar
11 votes
2 answers
559 views

Roman Empire goes to space

Here is the binary part for convenience: 01110010 10000000 10011111 10110111 Find what celestial objects has Roman Empire visited. Hint 1:
web adventurer's user avatar
3 votes
1 answer
292 views

Python Conundrum 2: Guess The Place

Python Conundrum: The Series The key: The puzzle: ...
web adventurer's user avatar
0 votes
1 answer
172 views

A Problem in Research using Logic

Here's a problem of my own design. You are researching 5 papers done in your field in order to guide your next paper. Some papers may have had a bad study design, used faked data, or otherwise would ...
Bob Bixler's user avatar
5 votes
1 answer
645 views

Python Conundrum: Guess The Song

Python Conundrum: The Series The key to the puzzle: The puzzle: ...
web adventurer's user avatar
0 votes
1 answer
163 views

Techno-Culinary Brain Teaser: Unravel the Code in the Kitchen

The answer is one word. The rebus:
web adventurer's user avatar
7 votes
5 answers
541 views

Mexican Standoff -- 4 way

You and 3 others are being held captive by the Great Leader and will be forced to engage in a 4-way shootout. The last one standing will be set free and the top priority for all involved is to go ...
Bob Bixler's user avatar
-1 votes
1 answer
233 views

Figure Out The Language: Min

Imagine there is a programming language in which you can only evaluate expressions. Expressions have operators and constants. There are three types of constants. Numbers - Any number from 0 to ...
The_AH's user avatar
  • 305
9 votes
1 answer
499 views

Java: Make a cast which is necessary at runtime, but not at compile-time

This is based on a very unusual behaviour of Java I recently found while implementing a personal project. It requires a very good understanding of Java and some knowledge of its standard library, and ...
Haspamelodica's user avatar
-5 votes
1 answer
243 views

Decipher a long sequence of numbers

51699624576811268526783109824167925197245652924177251787241782538786302873119768312852668312686625268245686752824473216878253830287925175273039778250852831287672527245665263006725397251762529312811498 ...
web adventurer's user avatar
7 votes
3 answers
521 views

Colliding Bullets again

Here's a colliding bullets problem of my own devising that's different from previous versions. Every second a gun has a 60% chance of firing a bullet in a straight line. After 10 seconds there would ...
Bob Bixler's user avatar
1 vote
1 answer
269 views

Reversing a binary string with a restricted Turing Machine

Some malevolent entity (me) asks you to construct a Turing Machine which, given an input on its tape of the form $LbR$ where $b$ is some binary string, changes this to $Lb^{-1}R$ then halts (where $b^{...
volcanrb's user avatar
  • 121
-1 votes
2 answers
251 views

Am but not equal

I am myself, but I am not equal to myself. What am I? Hint:
The Empty String Photographer's user avatar
9 votes
2 answers
688 views

Why did it crash?

You are on your computer on June 23rd, 2021 at 10:24:58 am, when it suddenly becomes bricked. Your electronic devices all fail, except for your newest technology. Why? Hint 1: Hint 2: This didn't ...
misc544's user avatar
  • 379
0 votes
1 answer
317 views

There is no programming language

...
poco's user avatar
  • 2,158
5 votes
1 answer
355 views

Warning!! We need to rescue Mr. Greg

Greg, our Server Security Admin, was locked up today in his own Server Room. (Yeah, quite crazy I know). The guy had forgotten the password to unlock his door. Fortunately he had saved the password on ...
Techidiot's user avatar
  • 18.9k
13 votes
2 answers
2k views

Do I still have time?

My boss told me he had something important to tell me, that I needed to read by the end of the day. I told him I was on it. See, I didn't want to admit I was "Working From Home" from the ...
Rubio's user avatar
  • 41.7k
5 votes
3 answers
309 views

Four 3x3 semimagic squares in a 5x5 grid

Can you place every number from 1 to 25 in a 5x5 grid such that it contains four 3x3 semimagic squares? A semimagic square is a square whose rows and columns all sum to the same number. This is ...
Dmitry Kamenetsky's user avatar
13 votes
1 answer
830 views

Ernie and the Chance to Save a Beautiful Relationship

I should have smelt a rat when Ernie invited me to an event at the local club rooms, because when I asked why his wife was not attending, he replied that she had another engagement for that night. “I ...
Penguino's user avatar
  • 14k
2 votes
1 answer
189 views

More bits the merrier

The computer department at Puzzled State University devised an inefficient bit-based (zeros and ones) number system, n', for their ever more bit-happy machines. ...
humn's user avatar
  • 21.9k
1 vote
2 answers
370 views

I am an 100 letter word, who am I?

I have been watching you. From the moment you were first conscious, I have been watching; Until the last time you lose consciousness, I will be watching. I am always by your side, witnessing you. ...
Ξένη Γήινος's user avatar
5 votes
3 answers
724 views

Solution for Robozzle puzzle no 291 - Huh? Part 2

I want to solve Robozzle puzzle number 291 - Huh? Part 2. You can see it raw in the image below. You need to collect the stars without falling out of the given grid. You are the rocket on top-left ...
garakchy's user avatar
  • 595
7 votes
3 answers
722 views

1000 digit sum calculation puzzle

I have 7 numbers that add up to the same value as the sum of the base 1000 digits of the product. Here are the numbers: 86, 203, 296, 395, 401, 407, 913 The first part of the puzzle is to understand ...
David's user avatar
  • 862
8 votes
4 answers
817 views

Shorter solution for Robozzle puzzle no 132 - Split

I wonder a shorter solution for Robozzle puzzle number 132, "Split." Puzzle is shown below. I have solved it but I'm wondering shorter solution for this and there many exist. Basically, the ...
garakchy's user avatar
  • 595
20 votes
1 answer
2k views

Using sentence, turn intense into incense; what tool do I need?

Puzzle What tool do I need to turn intense into incense, using sentence? The same tool can turn dated into demented, using statement. Hints (Kudos: the accepted answer was published before the hints.)...
Kamil Maciorowski's user avatar
9 votes
4 answers
719 views

How to make gifs showing a puzzle's solution process?

I've been repeatedly asked to turn this into a PSE question, so here goes. Some people may have noticed that, when I answer a grid-deduction question, my answer often includes, as well as a step-by-...
Rand al'Thor's user avatar
8 votes
3 answers
658 views

Parϯner up and find the imposter!

Messenger, Our 5 top agents ѡill sօon arrive in diಽguise for the big meeting this weeĸ, and each has provᎥded their credentialઽ, but we've just received word one may be an imρostеⲅ sent by ouᴦ enemies....
Chengarda's user avatar
  • 3,646
0 votes
1 answer
242 views

Someone else's Machine Learning tutorial code

This puzzle was inspired by some tutorial code I downloaded from someone else’s GitHub. To protect the guilty, I have withheld the author’s name, paraphrased the relevant Python into pseudo-code and “...
happystar's user avatar
  • 7,770
17 votes
2 answers
433 views

The Empty Cube (Interactive Puzzle)

I've made an interactive 3D cube puzzle in CSS, The puzzle is fully solvable from the images below, but the fully interactive version is here: https://codepen.io/chengarda/full/RwyKvwz The empty cube ...
Chengarda's user avatar
  • 3,646
3 votes
1 answer
444 views

Largest word tree

I was inspired by this awesome puzzle. Here is an image of a word tree borrowed from there: In a word tree every path from the root to the leaves must form a distinct word. The size of the tree is ...
Dmitry Kamenetsky's user avatar
-1 votes
1 answer
216 views

A rebus puzzle describing a name

This is a rebus puzzle describing a singer's name. This puzzle will still be pretty straight-forward, though you really need a little knowledge in programming this time... ...
Ξένη Γήινος's user avatar
-2 votes
1 answer
260 views

A rebus puzzle consisting of four characters

This is a rebus puzzle consisting of four characters. The puzzle is very simple if you're knowledgeable enough. Given four characters, guess two words: ΔΕὖ% The first word consists of 5 basic Latin ...
Ξένη Γήινος's user avatar
8 votes
1 answer
818 views

Rebus puzzle with four colored bars and diagonals between them

This is an extremely simple rebus puzzle, the answer is extremely obvious if you know where to seek, you only need some lateral thinking, and maybe some basic programming knowledge. To make it even ...
Ξένη Γήινος's user avatar
6 votes
1 answer
404 views

What is the encoded message?

I created the puzzle by myself. Encoded Message Examples Hello World Hello, World! Python Hints: I made another image to illustrate the encoding better (all the images were generated by a Python ...
Ξένη Γήινος'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
7 votes
1 answer
351 views

Follow the randomly-bouncing ball

We are going to generate information out of nothing (well, nothing and a bit of something) just by randomly bouncing a ball. The result will be a message you can use to protect humanity. Let's use ...
SlowMagic's user avatar
  • 13.8k
4 votes
1 answer
263 views

Sea of Sounds - A study on noise

(Author Note) A while ago I made some puzzles for a now defunct puzzle hunt project, here's one of them. The answer to this (and most other puzzles of said hunt) is a single word. The puzzle itself is ...
Auribouros's user avatar
  • 6,581
5 votes
1 answer
457 views

What symbol do the images represent?

These are two images representing the same symbol, the first image contains 25 blocks in 13 colors, it represents progression of its different states through time since it was initiated n years ago (<...
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