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klm123
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8 votes
3 answers
450 views

Find a straight tunnel 2

8 votes
3 answers
701 views

Guess your hat color, but you don't have to

8 votes
2 answers
481 views

Modifying the puzzle: Cooperative hat-guessing, no mistakes, 3+ colors

8 votes
6 answers
883 views

Guess another's present

7 votes
1 answer
286 views

Guess another's present 2: Generalised

7 votes
1 answer
3k views

Generalization of Sum and Product puzzle

7 votes
2 answers
2k views

Irreversible body swap

7 votes
1 answer
444 views

Ten matches on a table

7 votes
2 answers
922 views

Cooperative guessing against an evil god

7 votes
3 answers
436 views

Proving by weighting

7 votes
3 answers
1k views

How many digits can be removed from a division puzzle?

7 votes
3 answers
1k views

Most moveable chess position

7 votes
1 answer
1k views

What is the "linguistically hardest" number less than $10^9$?

7 votes
3 answers
2k views

Create a changeable maze

6 votes
4 answers
9k views

What is the pattern in this IQ test puzzle with spotted triangles and arrowed circles?

6 votes
1 answer
12k views

Maximal number of steps needed to solve 2x2x2 Rubik's Cube

6 votes
1 answer
145 views

When can one construct expression dividable by M from any N numbers?

6 votes
2 answers
2k views

What is the smallest tic-tac-toe board to have a winning strategy?

5 votes
1 answer
577 views

Optimal strategy against a random opponent

5 votes
2 answers
1k views

Is there a brute-force solution of this puzzle?

5 votes
1 answer
559 views

How to control the whole board with 8 standard pieces?

5 votes
1 answer
378 views

Is there a second solution to points and perpendicular bisectors problem?

5 votes
1 answer
900 views

Beautiful HH-pattern. Find it

4 votes
1 answer
660 views

Decode Voyager's Message to Aliens

4 votes
1 answer
263 views

Universal pie division [duplicate]

4 votes
1 answer
381 views

Can I Haz My Eye Center'd 2?

4 votes
1 answer
445 views

Minimising information to guess all hats correctly

3 votes
2 answers
238 views

How many ways to pick the fruit 2

3 votes
3 answers
15k views

Task 39 from iqtest.dk

3 votes
1 answer
583 views

$N_{max}$ balls in 3 weightings