Questions tagged [grid-deduction]
Puzzles such as Sudoku or Kakuro, where the final state of a pre-existing grid must be deduced logically through clues placed within and/or around the grid. Use with the [logical-deduction] tag. For puzzles where you are given a list of clues which can be used to compose a grid to solve them logically, use the [logic-grid] tag instead.
1,188 questions
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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
9
votes
1
answer
266
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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
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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
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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
4
answers
778
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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
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
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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
7
votes
6
answers
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“Afterlife” Sudoku puzzle
Fill each empty square with a number so that each row, column and 3x3 block contains all the numbers 1 through 9 exactly once.
To receive an upvote from me, you must completely solve this Sudoku.
For ...
- 27.1k
1
vote
1
answer
353
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Fill-in a 7x7 square
Fill in the following grid where each element is a pair formed by a letter from A to G and a digit from 1 to 7. Each pair of letter and digit does not repeat.
The rule is that letters and digits shall ...
- 1,116
2
votes
1
answer
154
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Sudoku puzzle with clues that are nicely positioned and nicely numbered
Beginner puzzle (suitable for people who are new to puzzle solving).
Fill each empty square with a number so that each row, column and 3x3 block contains all the numbers 1 through 9 exactly once.
...
- 27.1k
4
votes
1
answer
193
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My Somewhat Partially Revealed Minesweeper Puzzle Redux
This is a special form of classic Minesweeper with 3 additional rules to make it more challenging.
Rules:
All standard Minesweeper Rules apply. In this puzzle, there are 59 mines in total. 24 of them ...
- 895
3
votes
2
answers
318
views
A Somewhat Different Minesweeper
This is a type of Minesweeper puzzle I created, although I don't have a name for it yet. The rules are simple:
All standard Minesweeper rules apply
All cells with a 0, 1, or a 5 or higher are ...
- 895
2
votes
2
answers
218
views
What is the minimum number of unshaded cells in a square Nurikabe grid such that no two unshaded regions are the same size?
As a quick refresher, the rules of Nurikabe state that, given a rectangular grid:
Numbered cells are unshaded, and comprise an unshaded island containing a number of squares equal to the number in ...
- 121
8
votes
1
answer
299
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Arithmetic Sudoku
Consider this sudoku puzzle:
All normal sudoku rules apply.
But it has some extra conditions:
A,B,C must form an arithmetic series in that order. Equivalently, A+C=B+B.
D,E,F must form an arithmetic ...
- 3,136