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).
3,512 questions
2
votes
1
answer
223
views
Word Search - Find the hidden words
There are 2 hidden words here, except the given words below:
Words
ACETIC
ACTOR
CRUDE
ERODE
ERUPT
KNOWLEDGE
PEANUT
PITCHY
QUEEN
RACIAL
URBAN
And here’s the code for second hidden word:
...
- 2,572
-4
votes
0
answers
220
views
Help with humorous and complex logic puzzle clues [closed]
I’m working on an adult coloring/activity book to accompany my upcoming fantasy/adventure graphic novel series (you can check it out at Spookaluca.com) and am really struggling with writing clues for ...
4
votes
2
answers
298
views
Rooms and glases [closed]
Riddle:
You have two rooms. In the first room, there are two glasses, one of which contains poison. In the second room, there are four glasses, two of which contain poison. You are required to choose ...
9
votes
1
answer
266
views
Belated best wishes 2025 - four empty suguru (tectonic) puzzles - can you solve this using logic (without backtracking algorithm?)
I've become totally addicted to tectonics and in specific empty tectonics. Came across the tradition (see: 2024 2023) to generate four empty tectonics in the form of the digits of the year.
I couldn't ...
7
votes
1
answer
201
views
Min-Max Circuit Deduction
Handmade Puzzle: Min Max Circuit
Fit in the numbers satisfying the following rules.
Each row and column should contain 1~9 distinctly.
- Maximum cell: This cell should contain bigger number than ...
- 2,572
1
vote
1
answer
165
views
Fill a partially completed 5x5 Latin square with diverse diagonals
Beginner puzzle (suitable for people who are new to puzzle solving).
To allow new users to solve this puzzle and earn reputation points, I encourage all users whose reputation is 200 or more to not ...
- 27.1k
5
votes
1
answer
224
views
Most and Least curious
In this puzzle, the majority age is 14 years old.
Find the 5th most and 5th least:
Most curious
Least curious
S___k O______w
B__r, W__e & S_____s
M________s
C____e
S___r U__r
E____s
A_k U____u
...
- 6,668
5
votes
4
answers
778
views
Place numbers into the 6 circles to satisfy the summation constraints.
Using the numbers 0, 1, 2, 3, 4 and 5 (each exactly once), is it possible to place numbers in the circles so that:
0→4, 1→7, 2→12, 3→8, 4→3 and 5→5?
By X→Y we mean that the circles connected to X have ...
- 27.1k
10
votes
3
answers
882
views
Plenty colors Rubik's Cube
On a Rubik's cube without any color, each square has 3 possibilities:
I am not familiar with exact terms of the Rubik's Cube community so feel free to help me improve the vocabulary if necessary :)
...
- 6,668
6
votes
2
answers
561
views
Sudoku with additional rule for the top row: alternating odd and even numbers
I made this sudoku that in addition to the usual rules shall be solved considering also the following rule:
the first row shall contain alternating odd and even numbers, the top-left element is odd.
...
- 1,116
12
votes
1
answer
316
views
Slitherlink's cube
Two slitherlinks (snakes) lie hidden on the grid. A slitherlink
takes the form of a single loop around the surface of the cube, composed
of line segments between the dots, without crossing itself or ...
- 185
5
votes
2
answers
345
views
Sudoku with Special Rule(2)
Here is a sudoku, but with additional special rule.
The highlighted cells(which are gray) should have distinct number, from 1 to 9.
Could be quite hard… ;)
- 2,572
4
votes
6
answers
800
views
The Madhouse problem
Based on a Raymond Smullyan question from "Lady or Tiger".
In the madhouse are people who are either doctor or patient and who are either sane or insane. Sane people believe all true ...
- 2,158
4
votes
7
answers
2k
views
The Twin Brothers and the Judge
Based on a Raymond Smullyan question from "Lady or Tiger".
A judge must reveal which one of them committed a certain murder. He knows that one of them always lies. He is only allowed to ask ...
- 2,158
-1
votes
1
answer
252
views
I count fractions of rotation and have two digits, what AM I?
I count fractions of rotation and have two digits, what AM I?
I use letters over digits.
I don't use a pair of digits for my most significant digit from one of my series.
I can use any one of my ...
