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).

16 questions with no upvoted or accepted answers
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Is there a move-efficient way to rotate the center pieces on the Octo-Star?

I'm looking for a more efficient algorithm to rotate the center column of the Octo-Star puzzle 45 degrees. The situation below occurs when four properly-oriented edges are next to each other, ...
10
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0answers
203 views

What's the name of the kind of puzzle where in-story solvers have more information than us, and how far they get is a clue?

It involves logical/mathematical puzzle(s), so no wishy washy different interpretations like in riddles. The puzzle in question tells a story involving a puzzle, but some details about the puzzle in ...
8
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1answer
1k views

Is there another name for this puzzle? (Kyudoku, Nine Find)

Is there another name for this type of puzzle? I can only find two examples of it online: https://www.brainzilla.com/logic/kyudoku/ http://ninefind.com/ In the game you start with a 6x6 grid filled ...
6
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157 views

Decoding a mystery sequence of falling boulders

I'm trying to unravel the algorithm for an old 1980s game called Wanderer. The game is a simple grid: 16 cells high (all visible in the image) and 40 cells wide (though not all are depicted). In the ...
6
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0answers
130 views

How can I create written logic puzzles with multiple variables and the fewest number of clues?

When I refer to written logic puzzles, I mean those in which, for example, 5 men wearing 5 different colors of aprons are bringing 5 different pies from 5 different cities to 5 different booths in the ...
5
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0answers
230 views

Trying to find a 2020 puzzle hunt with a puzzle based on Among Us

I am trying to find a puzzle hunt that I believe was held in 2020. It contained a puzzle based on the game Among Us with 26 characters, and you had to decide who were the imposters. The imposters all ...
4
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0answers
129 views

What is the name of this hook-like puzzle?

I don't know the name of this puzzle but I'd like to be able to google it See the attached photo. (I've already search on G puzzle and Hook puzzle without any luck).
4
votes
1answer
330 views

A slightly different type of Sudoku puzzle

The following image shows two valid Sudokus. The first was copied verbatim off Wikipedia, and the second was obtained by rotating 90 degrees. Any two distinct valid Sudokus must differ in at least ...
3
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0answers
215 views

Mega-puzzle of many number puzzles: Nikoli Octathlon

This puzzle has been my Moby Dick of puzzles for so long. It's from MellowMelon's old puzzle site and is a Nikoli-based megapuzzle with eight sub-puzzles. I'm copying the puzzle image from there so as ...
3
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0answers
417 views

Logical descriptions of logic puzzles

What notations are there to describe a logic puzzle format? Here, I'm talking about logic puzzles like Sudoku, Bridges, Kakuro, Tents; games with exact rules and an exact & finite number of ...
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0answers
86 views

Most leads in a "difficult" Sudoku

Since "difficult" is undefined, let me define it arbitrarily: A Sudoku is difficult if it can't be solved by only considering singles (naked or hidden), the most basic solving strategy. How ...
2
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154 views

What is the Name of this Toggling Puzzle?

I came across an interesting toggling puzzle while looking through a code repository on GitHub. I want to find out more about it and see if there is any info on how to solve it, how to ensure ...
1
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1answer
318 views

Her granddaughter is the only daughter of my brother

Pointing to a woman, Abhijit said, "Her granddaughter is the only daughter of my brother." How is the woman related to Abhijit? Sister Grandmother Mother-in-law Mother Source of the ...
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74 views

Grids with tiles of two colors and connectors

Make a square grid with an even side. Make a continuous trail which passes through all small squares; the trail ends where it started. Where there is an angle you can put a red or a blue tile. On ...
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234 views

Reverse Engineering Computer Formula

A computer uses an unknown formula to create a 4 digit Output using specific Input. Here are 3 examples: Input = 20066 : 020470 : 47 : 1 : 322267 Output = 0927 Input = 20066 : 020470 : 46 : 3 : 198684 ...
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338 views

A Logician's Game of UNO Flip

Two players are in the middle of an ongoing one-on-one game of UNO Flip, with all its standard rules in effect. Play is currently Light Side Up. It is Player B's turn. Player A has 3 cards remaining, ...