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1500 questions
122
votes
7 answers
100 Prisoners' Names in Boxes
Names in Boxes
The names of 100 prisoners are placed in 100 wooden boxes, one name to a box, and the boxes are lined up on a table in a room.
One by one, the prisoners are led into the room; each may look in at most 50 boxes, but must leave the…
Jaydles
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121
votes
1 answer
Paper Picture Puzzle
Here is a puzzle I drew
Your final answer will be what you need to know to solve this puzzle (You'll know it when you have the final answer)
Notes:
I did a couple dumbs. One is the space planning. Anywhere with awkwardly written or squeezed in…
stacksfiller
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119
votes
13 answers
If you only have half of me, then I am of no use
People think a part of me is sticky, but I'm not. I do have a
sticky friend though.
I can create almost anything, but I'm not very creative.
After I have done my thing, you can't tell that I did it. To be
honest, it wasn't my creation to…
SirDuckduck
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118
votes
3 answers
Prove that π > 3
It seems that once upon a time some politicians tried to pass a law fixing the value of π to be exactly 3. The idea being to "make math simpler so that our children can get better at math".
Don't let this happen.
The area of a disk is given by A =…
Florian F
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117
votes
8 answers
Make all the statements true
Can you make all the below statements true with a single click? If yes, explain how.
Three + Eleven = Ten
Seven + Five = Six
Two + Four = Eight
NB: 'A Single Click' means, with only a single left mouse button click. Not with a series of steps…
AeJey
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115
votes
5 answers
Mate in 0 moves
Not exactly a traditional chess puzzle, and I won't offer much of an explanation for fear of giving away the answer.
White must mate in 0 moves, meaning he must deliver a check mate without touching any of his pieces. How can he do that?
Courtesy…
JGibbers
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115
votes
9 answers
A hunt for long forgotten treasure ...but beware the pirate's curse!
I never really knew my uncle growing up. He seemed nice enough, but I got the sense from the distant, troubled look in his eyes that there was at least some truth to the rumours...
Years before I was born, his fishing trawler was lost at sea under…
Alconja
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114
votes
2 answers
3 Logicians Walk Into a Bar
Three logicians walk into a bar. The barman says, 'Does everybody want a drink?'
The first logician says, 'I don't know.'
The second logician says, 'I don't know.'
What does the third logician say?
Please provide a clear explanation of why each of…
Bob
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113
votes
1 answer
Cryptic Clue Guide
This post is not a puzzle. There is nothing puzzly hidden inside it or the self-answer, posted at the same time.
What exactly is a cryptic crossword clue, and how do I write one?
Deusovi
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110
votes
1 answer
This party ends in tragedy (I planned it from the start, you see)
The DJ from Moscow was pumping out tunes.
The house mostly bare but for furniture, strewn;
A sofa for three and an armchair for one.
The guests started piling in, looking for fun...
'Twas Elle who came first, seeking somewhere to slouch,
…
Alconja
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109
votes
3 answers
The brain-curdling eldritch horrors and the third dimension
We're in the year 2016 so it's finally time to take puzzles to the 3rd dimension!
So let's see what those beautiful times bring us today:
(click to enlarge)
Everyone of you clever sods could as well have a look at the real thing
(please…
Avigrail
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107
votes
1 answer
A strange hotel
Entering the lobby, I requested a room. The clerk handed me my key and I took the elevator to my floor. To my surprise there was a sign on the door of my room telling me I should try a different room instead.
I headed to my new room on the floor…
Matt
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106
votes
2 answers
This new puzzle type needs a name
I believe I have invented a new type of puzzle...
What is its name?
Colour-blind-friendly version available here.
Begin by solving the 16x16 sudoku; each of the digits 1-16 must appear exactly once in each row, column and thick-bordered 4x4 box.…
Stiv
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106
votes
9 answers
Five coloured doors, which leads to freedom?
You have been incarcerated in a high-security prison for several nefarious crimes which we need not go into here. The warden, being a kindly logician, offers you a single chance to escape. You are blindfolded and given a choice of five doors, one of…
Rand al'Thor
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105
votes
4 answers
Checkmate in 1 on a Tangled Board
Lots of pieces are tangled here.
Can you find mate in one?
Small hint to guide you in the right way:
If you look at this position as a normal chess puzzle, the answer might be easy. However, notice the retrograde-analysis tag. To fully solve the…
shoopi
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