User isaacg

34 votes

Knights, Knaves and Spies - Part 1

answered Dec 30, 2014 at 11:33

31 votes

Accepted

Creating the hardest 6x6 maze

answered May 28, 2020 at 1:09

25 votes

Accepted

A pizza dilemma

answered Mar 4 at 4:48

24 votes

Accepted

Consecutive integers around a circle

answered Mar 3, 2019 at 4:38

22 votes

Accepted

Can White still castle?

answered May 18 at 16:49

19 votes

Accepted

A check is a win

answered Dec 4, 2023 at 3:42

19 votes

Open-ended challenge: Find the longest morsagram word pair

answered Dec 11, 2014 at 20:05

18 votes

2023 From Single Digits

answered May 2, 2023 at 4:22

16 votes

Accepted

A puzzle about two coins of total value of 15 cents, one of which is not a nickel. Is it correct at all?

answered Mar 2 at 18:18

15 votes

Melissa's Numbers

answered Mar 13 at 17:07

15 votes

Accepted

75 integers are squared or cubed: minimum distinct results?

answered Mar 28 at 5:31

15 votes

Accepted

Drowning Squirrel

answered Apr 6, 2023 at 22:09

14 votes

Accepted

Digit and (Digit) are different!

answered Jul 7, 2023 at 6:36

14 votes

Accepted

Blindfold Bingo

answered Apr 16, 2019 at 22:31

13 votes

Accepted

Covering an 8x8 grid with X pentominoes

answered Oct 17, 2019 at 19:02

13 votes

Accepted

Four ones and four zeros

answered Mar 19, 2023 at 10:27

12 votes

Accepted

Eight coins for the fair king

answered Dec 28, 2018 at 6:49

12 votes

Fewest number of prisoners needed

answered Mar 11 at 9:12

12 votes

A robot surviving on top of a 3x3 platform

answered Nov 13, 2019 at 6:21

11 votes

Blue eyes riddle: what information is gleaned after the first night?

answered Jul 22, 2020 at 18:59

11 votes

Can the cop catch the thief?

answered Oct 30, 2021 at 9:43

11 votes

Two Men - The Physicist and Plumber

answered Nov 13, 2014 at 12:22

11 votes

Finding the larger number with a minimal number of questions

answered Jul 23, 2023 at 9:39

9 votes

Accepted

10000 rounded to the nearest integer is 22

answered Oct 30, 2023 at 3:24

9 votes

What is the name of this mechanical puzzle with two G-like hooks interlocked?

answered Jan 30 at 1:30

9 votes

Accepted

Shuffled binary numbers version 2

answered Nov 4, 2023 at 2:48

7 votes

Accepted

Largest binary rectangle without any arithmetic progressions

answered Jul 11, 2023 at 8:12

7 votes

Longest English homophone/heteronym chain

answered Jun 11, 2023 at 10:50

7 votes

The dessert problem (blind ballot remaining blind if non-unanimous)

answered Dec 27, 2022 at 10:06

7 votes

Impossible knot

answered Jan 11, 2023 at 10:00

Stack Exchange Network

67 Answers

Knights, Knaves and Spies - Part 1

Creating the hardest 6x6 maze

A pizza dilemma

Consecutive integers around a circle

Can White still castle?

A check is a win

Open-ended challenge: Find the longest morsagram word pair

2023 From Single Digits

A puzzle about two coins of total value of 15 cents, one of which is not a nickel. Is it correct at all?

Melissa's Numbers

75 integers are squared or cubed: minimum distinct results?

Drowning Squirrel

Digit and (Digit) are different!

Blindfold Bingo

Covering an 8x8 grid with X pentominoes

Four ones and four zeros

Eight coins for the fair king

Fewest number of prisoners needed

A robot surviving on top of a 3x3 platform

Blue eyes riddle: what information is gleaned after the first night?

Can the cop catch the thief?

Two Men - The Physicist and Plumber

Finding the larger number with a minimal number of questions

10000 rounded to the nearest integer is 22

What is the name of this mechanical puzzle with two G-like hooks interlocked?

Shuffled binary numbers version 2

Largest binary rectangle without any arithmetic progressions

Longest English homophone/heteronym chain

The dessert problem (blind ballot remaining blind if non-unanimous)

Impossible knot