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1500 questions
28
votes
11 answers
What is my four digit car number?
My car has a four digit number with no leading zeros, and the following properties:
Its last digit is double the first digit
its middle two digits are the same
its last two digits are double the first two digits
What is my car's number?
Deepu Sasidharan
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28
votes
7 answers
23 Clones and Two Lightbulbs
Rise and shine, Mister Bond.
James awoke to find himself yet again imprisoned by an evil genius. At least, that's what he presumed. He was alone in a room with a strange device: it consisted of a person-sized glass chamber, with a single tube…
Mike Earnest
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28
votes
1 answer
Careless smokers
Cosmo complains: "At the party yesterday at our place, some guys were smoking in our living room. This morning we detected that these careless smokers had burnt four holes into the carpet."
Fredo: "What a shame!"
Cosmo continues: "The carpet is a…
Gamow
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28
votes
3 answers
The lake monster
You are on a rowboat in the middle of a large, perfectly circular lake. On the perimeter of the lake is a monster who wants to eat you, but fortunately, he can't swim. He can run (along the perimeter) exactly $4\times$ as fast as you can row, and…
Neil
- 2,116
- 2
- 18
- 26
28
votes
5 answers
I have two faces, but show you one
I have two faces, but show you one.
I once had guests, but now have none.
I'm rarely bloody and seldom blue.
I'm often promised and sometimes new.
What am I?
Cubicon
- 1,222
- 11
- 16
28
votes
4 answers
Melissa's Numbers
Melissa has noticed that certain positive integers can be written as the product of other integers, none of which uses any of the digits in the number itself, 512, for example (512 = 4 x 4 x 8).
Ten consecutive positive integers cannot all be one of…
Bernardo Recamán Santos
- 18,674
- 2
- 37
- 218
28
votes
1 answer
What do you call a pH Table?
The answer is two words (12 letters) which describe a pH table in a cryptic sort of way.
Amoz
- 26,817
- 2
- 63
- 159
28
votes
4 answers
Can you beat random?
It is known that one cannot beat a truly random player in Rock Paper Scissors.
Here you will play a variant of the game. In this variant you are not allowed to play the same shape twice in a row. So if you have played rock then in the next round you…
Dmitry Kamenetsky
- 35,897
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- 66
- 276
28
votes
1 answer
The nameless horror
Long ago, we defeated the nameless horror that plagued our lands. We thought it was gone forever, but now ____. It's currently approaching our village roaring with ____ laugh, and witnesses say its appearance ____ than ever before...
SOLDIER A: I…
Jafe
- 78,615
- 8
- 162
- 614
28
votes
1 answer
The body in the cellar
This puzzle is part of the Monthly Topic Challenge #7: Board games.
On a cold December night in 1992, several guests have arrived at a mansion in Beverly, Massachusetts.
An hour later, the body of the host is found in the cellar.
You have been…
Amoz
- 26,817
- 2
- 63
- 159
28
votes
2 answers
A logician's Bingo
Mark some cells on the following Bingo board, so that all statements in marked cells are true AND all statements in unmarked cells are false.
A Bingo here is a set of five marked cells in a row, column, or diagonal. There are two diagonals: forward…
Bubbler
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28
votes
2 answers
What is this magic trick with 6 cards featuring numbers between 1 and 60?
I hope this is on topic. I have a set of kids' magic tricks but I have lost the instructions! I was hoping this might be a good place to get some help.
Here is the first one.
What is the trick and how does it work?
Simd
- 7,845
- 2
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28
votes
1 answer
What's the most important life lesson?
Important Life Lessons:
Life can be a confusing game at times. Here's some important lessons you should follow:
Time stops for no man - Life is always changing, before you know it, there could be whole new generations before your eyes!
There is…
Beastly Gerbil
- 58,036
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28
votes
1 answer
Alien decimal numeral system
During our travels around the galaxy we found many alien cultures with different number systems. However, this specific civilization was quite interesting: they had a decimal numeral system, just like ours! To facilitate communications we learnt…
Megaptera novaeangliae
- 525
- 3
- 10
28
votes
1 answer
PSE Advent Calendar 2021 (Day 11): What Child – Er, Game Is This?
This puzzle is part of the Puzzling StackExchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door >
I. The story
The snow was blowing, the hot cocoa was warm, and I…
Sciborg
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