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isaacg
  • Member for 9 years, 6 months
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33 votes

Knights, Knaves and Spies - Part 1

31 votes
Accepted

Creating the hardest 6x6 maze

24 votes
Accepted

Consecutive integers around a circle

19 votes

Open-ended challenge: Find the longest morsagram word pair

19 votes

2023 From Single Digits

19 votes
Accepted

A check is a win

15 votes
Accepted

Drowning Squirrel

14 votes
Accepted

Four ones and four zeros

14 votes
Accepted

Digit and (Digit) are different!

14 votes
Accepted

Blindfold Bingo

12 votes

A robot surviving on top of a 3x3 platform

12 votes
Accepted

Eight coins for the fair king

11 votes

Finding the larger number with a minimal number of questions

11 votes
Accepted

Covering an 8x8 grid with X pentominoes

11 votes

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

11 votes

Can the cop catch the thief?

11 votes

Two Men - The Physicist and Plumber

9 votes
Accepted

10000 rounded to the nearest integer is 22

9 votes

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

9 votes
Accepted

Shuffled binary numbers version 2

8 votes
Accepted

Largest binary rectangle without any arithmetic progressions

8 votes

Impossible knot

7 votes

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

7 votes

Longest English homophone/heteronym chain

7 votes
Accepted

Treasure hunt 'round the world! (clue 4)

6 votes

The shorter the message, the larger the prize (version II)

6 votes

MIT Intro to Psychology, Raven's Progressive Matrices question

5 votes

2 vs. 1.005^200

5 votes

Primeable numbers

5 votes

Knight and knave impostors!