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1 vote
2 answers
169 views

Pipes and Tanks' Network

4 votes
2 answers
241 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?

8 votes
1 answer
758 views

Is this maths equation leading me through the first or second door?

9 votes
1 answer
1k views

Mensa IQ app: four boxes with four numbers each

16 votes
2 answers
1k views

The universal ticket

9 votes
3 answers
367 views

The END (Riley riddle)

3 votes
2 answers
713 views

Pan Digital Lucky Seven wants you to figure out all the digits

0 votes
9 answers
5k views

Multiple Choice Puzzle

4 votes
1 answer
271 views

SETI message received

4 votes
2 answers
358 views

Can the Bomb squad succeed?

7 votes
2 answers
196 views

The Pawn March Problem

3 votes
1 answer
304 views

A strange corporate

5 votes
1 answer
165 views

Sum Like It Simple

6 votes
2 answers
325 views

Taking turns adding a number 1,2,3 to a 3x3 matrix without repeating numbers in the rows or columns: does the first player always win?

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