Puzzling Stack Exchange
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1500 questions
40
votes
5 answers

Blindfolded and disoriented near the Great Wall of China

You are blindfolded and disoriented, standing exactly 1 mile from the Great Wall of China. How far must you walk to find the wall? Assume the earth is flat and the Great Wall is infinitely long and straight.
dshin
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3 answers

Hungry lions and a goat

There are 53 lions in a cage and 1 goat. All the lions are very hungry and would want to eat the goat. But the problem here is that any lion who eats the goat can satisfy his hunger but he will himself become a goat and then other lions will eat…
Harryom
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4 answers

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 best hand would have the worst hand, and vice versa.…
2012rcampion
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11 answers

Sudoku net that is always solvable

A sudoku net is a 9x9 grid where every cell is either (blank) or has a cross (block). A random solved sudoku is chosen. The net is placed on top of the sudoku (in any of the 4 ways). We can only see the cells that have a blank over them and the…
ghosts_in_the_code
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6 answers

Packing pentominoes in a circle

You want to prepare a pizza of 12 flavors. You have 12 oddly-shaped pieces of cheese that you decide to use for the pizza. The shapes happen to be ... Oh, well, forget it! This isn't going to be even remotely realistic. So here is the problem: I…
Florian F
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2 answers

Can you refold a hyper plus sign into a cube?

If you take a cube, and grow a new cube out from each of its six faces, you will get a "hyper plus sign": This 3D solid has an interesting property. It can be sliced along its edges and unfolded into a single 2D shape that can then be re-folded to…
plasticinsect
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1 answer

Note: The above should render as a bunch of flag emoji, which Windows 10 and 11 apparently don't support (!), so here's a screenshot if you want to see it. Hint 1: This is a total Chad move Hint 2: What is a Chad move? P.S. Now that this…
wjandrea
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2 answers

Alice and Bob invent a game

The rain was still falling in Wales, and Alice and Bob were terribly bored of having to stay inside the caravan. With just a deck of cards to entertain them they had played all of the card games in their repertoire – several times over. Suddenly…
Stiv
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7 answers

9-5=5? Matchstick problem

Move one matchstick to make an equality. Question made by me (Is this too easy?)
Culver Kwan
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1 answer

Ridiculous problem from an old maths textbook

There's a puzzling little problem I found in one of my old maths textbooks (Basics of Madthematics). In the middle of a whole bunch of normal problems on calculus and algebra and whatever, suddenly there's this. The book has no answers either, and…
Anon
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9 answers

An old picture puzzle

Here is a drawing of an old picture. Your task is to answer all 8 questions correctly AND give a good reasoning for it What time of day is it? Is it early spring or a late fall(autumn)? Is this river navigable? Which direction does the river flow?…
Novarg
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1 answer

A Morse Conundrum

Yesterday, I intercepted a message encoded in Morse code, but, because I was extremely tired, decided to wait until today to decode it to plain text. However, when I looked at the piece of paper I had written it on, I could not make heads nor tail…
ZanyG
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39
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6 answers

Charlotte's lost fish

The tropical sun was still down, but the Ruritanian marketplace was already bustling with people. Charlotte hurried through the crowd. She was out of fish. Charlotte had been in town for weeks and already knew the place like the back of her hand.…
Jafe
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39
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1 answer

"I can use computers, grandson!"

My grandmother loves matchstick puzzles. Every time I visit, she shows me a brand new set for me to solve. I visited her recently for her birthday, and I was excited to receive a puzzle in exchange for my gifts. I opened the envelope and three…
Zimonze
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1 answer

Abnormal Beyond Stressed

The autumn had already coloured the nearby tall hill, and the chilly breeze was almost cold enough to cause serious injury, when Rose crossed the wide street that was almost blocked by a large herd of sheep. She decided to take a breather,…
Bass
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