Questions tagged [logical-deduction]
A puzzle that requires formal logical deduction to arrive at the solution. This suggests more than merely reasoning through clues to find an answer (you might want [situation] for that).
3,547 questions
11
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3
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786
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The Royal Relay on a Chessfield
Playable Version
In the ancient Kingdom of Gridoria, a mysterious curse has frozen the entire realm: every citizen, every castle, every mountain.
The royal court's only hope lies in a sacred Relay ...
- 32.5k
10
votes
2
answers
939
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Shortest tour from a Bishopawn
A Bishopawn is here defined as a Bishop that can also advance one square, just like a Pawn. That means the Bishopawn can change its square color and visit all the squares!
What is the minimum number ...
- 7,820
1
vote
1
answer
171
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What is the next cell in this sudoku?
This is the NYT hard puzzle of the day on 14 July 2025
What am I missing?
...
- 11
0
votes
0
answers
135
views
That's not a Puzzle @JKHA!
You are forbidden to comment: that's not a puzzle @JKHA! And all the tags are wrong!
Otherwise, I will answer: 13th of July 2025 A B C D E.
Puzzle Explain why the tags are correct.
- 7,820
3
votes
2
answers
109
views
Use numbers one through six in groups of three so that each number is used twice [closed]
Use the numbers one through six in groups of three so each number is used twice
- 47
8
votes
2
answers
437
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A Simon Tatham's Loopy (aka Slitherlink) puzzle
While playing Loopy in Simon Tatham's collection, I came across a very difficult one. I can generally solve 10x10 Hard puzzles in a few minutes, but I was stuck on this one for a long while. ...
- 4,519
2
votes
1
answer
247
views
brilliant.org puzzle: S's hat color
Okay, one more question from the same website brilliant.org, but this time I am in the '100 Days of Puzzles' section (Again, free user here. As I have completed all the questions in this section, I ...
- 79
5
votes
2
answers
268
views
Is Statement #1 True or False?
I am doing this logic question from brilliant.org in "Strategy Puzzles" section (I am out of keys right now because I am a free user). Originally, I intended to upload this question on MSE, ...
- 79
4
votes
1
answer
383
views
5 Elders Guess Hat Colour, part II: after passing the bottle around
This is followup for problem 5 Elders Guess Hat Colour:
Five elders are sitting around a large bonfire. They know that Oluf
will put a hat of one of four colours (red, green, blue or yellow) on
each ...
- 416
1
vote
1
answer
193
views
Missing Game Archive 2 - What was the pattern?
This puzzle is one of the Missing Game Archive Series, which is my first PSE series. This series is about guessing the missing pieces in the game archive. Have fun!
« Previous Puzzle: Missing Game ...
- 3,323
4
votes
2
answers
309
views
Missing Game Archive 1 - What was the number?
This puzzle is one of the Missing Game Archive Series, which is my first PSE series. This series is about guessing the missing pieces in the game archive. Have fun!
» Next puzzle: Missing Game ...
- 3,323
6
votes
1
answer
1k
views
Which one is the laziest?
Five beggars are on a street corner.
A rich man comes and announces: $100 for the laziest of you.
Three of them jump up and start arguing who is the laziest.
One is on his back. Eventually says ...
3
votes
0
answers
218
views
Are block based puzzle games NP hard? [closed]
I’ve become interested in puzzle games that combine traditional Sokoban mechanics (box pushing) with shortest-path optimization—specifically puzzles where your objective isn’t merely to reach a goal ...
- 131
1
vote
2
answers
420
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Fifteen boxes of three sizes and five colors
Logical Reasoning Aptitude Test (Moscow)(1986) (Krasnogorsk Local Students Meet)
There are 15 boxes of three different sizes – large, small and medium and of five different colors – red, white, black, ...
- 127
6
votes
1
answer
709
views
Creating the hardest 6x6 maze w/ 9 walls
We had a previously great puzzle called "Creating the hardest 6x6 puzzle".
My question is: What is the longest forced tour if we are limited to using exactly 9 walls?
The Puzzle Basic Rules:
...
- 32.5k