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klm123
  • Member for 10 years, 1 month
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60 votes
3 answers
289k views

What is the number of the parking spot?

59 votes
8 answers
6k views

Find a straight tunnel

31 votes
5 answers
6k views

Two spies throwing stones into a river

26 votes
6 answers
30k views

The 10,958 Problem

25 votes
3 answers
19k views

Write twenty-four from four numbers

25 votes
8 answers
4k views

How to choose at least half of everything

21 votes
5 answers
10k views

Help me to find a small but hard and clever maze

19 votes
11 answers
15k views

Knight, Knave and Joker puzzle

18 votes
2 answers
2k views

How to create a pure mathematical-logical based puzzle equivalent to resistance based physical puzzle?

18 votes
3 answers
4k views

Knights and jokers

17 votes
5 answers
1k views

Universal dissection

17 votes
2 answers
827 views

Are you more clever than Alice?

16 votes
4 answers
38k views

How to solve this IQ test puzzle with arrows and pied squares?

14 votes
5 answers
3k views

What is the smallest positive integer, which can not be written without repetitions of digits and using arithmetics only?

14 votes
3 answers
722 views

Strategy to beat the Casino reversed

14 votes
7 answers
8k views

IQ-test-type question - sequence of large triangles with black and white small triangles in them

13 votes
2 answers
1k views

Let's deal with "Names in Boxes" Safely

13 votes
7 answers
3k views

The smallest crossword

13 votes
7 answers
3k views

Fastest way to collect an arbitrary army

11 votes
1 answer
757 views

Find the color of the chess pieces

11 votes
1 answer
4k views

How to solve this crazy Chinese puzzle for children?

11 votes
2 answers
738 views

First number, which can not be defined

11 votes
2 answers
484 views

From knights to kings

10 votes
3 answers
6k views

Mirrored numbers

10 votes
2 answers
972 views

Is there a retrograde analysis puzzle like "Point on the incorrectly drawn chess piece"?

9 votes
2 answers
882 views

How to generalise hang picture puzzle?

9 votes
2 answers
797 views

Middle weight puzzle

8 votes
1 answer
629 views

Find the smallest N to complete the task: "Write a true self-reflective statement about the digits from 0 to N"

8 votes
4 answers
1k views

How to lock a shared artefact

8 votes
1 answer
935 views

Number of tries to guess M-1 letters from M-letters-code