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12 votes
5 answers
1k views

How fast can you win this (very stupid) game?

7 votes
0 answers
279 views

What is a Good Pasta Number™?

6 votes
0 answers
371 views

A mysterious note in the lab

3 votes
2 answers
47 views

Finding a mystery number from a sum and product, with a twist

0 votes
1 answer
91 views

Prove that all 101 balls have the same weight

17 votes
1 answer
337 views

tnih neddih eht kcehc

14 votes
2 answers
560 views

Going around in circles

10 votes
1 answer
523 views

Adam Smith and David Hume

3 votes
6 answers
1k views

3 doors guarded by 1 knight and 2 knaves

3 votes
1 answer
130 views

Generalized knights and knaves puzzle

0 votes
1 answer
98 views

What is the pattern in the sequence? -1, 3/2, -13/6, 25/8

5 votes
1 answer
379 views
+50

Rubik's Cube with no two squares of the same color on any horizontal, vertical or diagonal line

10 votes
4 answers
438 views

The Bogotá Marathon

18 votes
2 answers
773 views

Nonconsecutive Anti-Knight Fillomino?

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