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25 votes
4 answers
4k views

The "Loop of rope" dilemma

  • 6,977
24 votes
13 answers
4k views

Can the cop catch the thief?

  • 4,883
13 votes
10 answers
3k views

A simple Matchstick puzzle [closed]

  • 38.8k
13 votes
2 answers
451 views

Put three pieces of cake into a round box

  • 4,883
12 votes
2 answers
1k views

Laser and mirrors on a 4x4 grid

12 votes
2 answers
1k views

How many "mathletic" couples were having dinner at the table?

10 votes
2 answers
410 views

How many times do the magicians' coats change color?

10 votes
2 answers
511 views

Permutations of first 10 natural numbers such that all the prefix sums are distinct

  • 201
9 votes
1 answer
833 views

Removing coins from a pile depending on the previous move

  • 11.5k
7 votes
2 answers
1k views

A rectangle cut into two pieces, which build a square

  • 11.5k
7 votes
1 answer
388 views

Identify someone as a truth-teller, liar or toggler with one yes/no question

  • 79
5 votes
3 answers
656 views

Three applicants, six hats

  • 1,684
4 votes
2 answers
390 views

Sum in Magic star puzzle

4 votes
2 answers
534 views

How many seats around the table?

4 votes
2 answers
260 views

If the door in Monty Hall is opened by a person without knowledge of where the prize is, and also does not reveal prize, do the odds change?

3 votes
1 answer
186 views

Guessing Two (or Three) Different Integers

2 votes
1 answer
146 views

Find two integers based on their sum and a random number

  • 11.5k
2 votes
2 answers
346 views

Choose the wine

2 votes
5 answers
486 views

2, 3, 9, 19, 36, 62, 92 - Which number is the odd one out? [closed]

2 votes
1 answer
99 views

How to fill up the numbers in a set of empty discs drawing a pentagon? The target sum is 10 [duplicate]

1 vote
10 answers
842 views

Two secret numbers [duplicate]

0 votes
2 answers
373 views

A certain 'Monty Hall' variant was played. How many doors were there, and, what was the value of the prize?

-2 votes
1 answer
171 views

Colored trominoes touching corner-to-corner on a grid