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1 vote
3 answers
159 views

Place and slide seven pennies onto 7 of the 8 vertices of the 8-pointed star

-1 votes
0 answers
21 views

Make 147896325=523698741 by modifying it, but in a weird method

0 votes
0 answers
21 views

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5 votes
1 answer
186 views

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8 votes
2 answers
606 views

Make 987654321 = 123456789 by adding as few as operators as possible

5 votes
4 answers
635 views

Two Operand Change

12 votes
6 answers
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12 votes
1 answer
849 views

Foe and a friend. Answer to this riddle is elementary.

7 votes
3 answers
612 views

Extracting a fair coin flip from a biased die, with a time limit

7 votes
3 answers
1k views

Spiders and Invisible Ant on a Tetrahedron

5 votes
3 answers
2k views

A simple solution for two awkwardly formed corners

-2 votes
0 answers
51 views

Searching a Moving Target in a Dynamic Cyclic Array

4 votes
0 answers
408 views

What an integral grid

8 votes
3 answers
523 views

Reverse Wordle: Five Clues, One Answer

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