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.
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An unusually tricky Galaxy
Background
I love Simon Tatham's Puzzles, especially for killing the odd few minutes. One of the available puzzles is Galaxies, based on Tentai Show. I can usually solve these in anywhere from 30 ...
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An Irregular Colombian Sudoku
Solve the Irregular Sudoku below (by Xavier Castillo), where the usual rules apply.
The dots outside the board on top indicate how many cells in the corresponding column or row of that board contain ...
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Mercury in Centigrade
This is part 55 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Dear Puzzling,
This is a non-consecutive thermo sudoku. Fill the grid so that each row, column ...
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What can I deduce next about this daily Light Up (Akari) puzzle? (Feb. 22, 2024, 7x7 Hard)
So yesterday, I was searching for online logical deduction puzzles when I came across this website called Brain Bashers which is a site filled with many different types of puzzles.
I have been going ...
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What can I next logically deduce in Day 62 of the Minesweeper Advent Calendar? (Fake 3D)
So I have gotten back into playing the Minesweeper Advent Calendars on heptaveegesimal.com, and recently came across the 2023 Minesweeper Advent Calendar. I am currently trying to beat Day 62, which I ...
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Add rules to Minesweeper until you can start with nothing
Think of classic Minesweeper game, with the following list of restrictions on the placement of mines:
C (Connected): All mines are connected via 8-way neighborhood (orthogonal and diagonal).
Q (Quad):...
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The Minesweeper Puzzle That Might Stump People
I thought this might be a different kind of puzzle. This is a game of Minesweeper that I played earlier today.
All standard rules apply. For those who don't know, the number inside of each cell ...
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Impossible pattern in slitherlink
The puzzle here is to analyze the following Slitherlink configuration and show that it is impossible.
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Continue a hard Loopy/Slitherlink puzzle without brute-force
This is a classic Slitherlink puzzle from Simon Tatham's Portable Puzzle puzzle collection. I was stuck at the position shown for quite a while until I found a way to continue by logical deduction. I ...
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Unchained Again
This is part 53 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Dear Puzzling,
The black and white circles in this grid form a Masyu puzzle. Draw one continues ...
- 78.6k
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A Colombian Jigsaw Sudoku
This is a Colombian Jigsaw Sudoku where the usual rules apply, but with irregular boxes. The dots in the right-hand scheme indicate how many of the numbers in a particular row or column are correctly ...
- 541
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How do I transcribe a Kakuro into a Google Sheets?
As other questions of mine mentioned, I have been slowly working through some PDF puzzle books. I will shortly come up on Kakuro puzzles. Here is an example from the Wikipedia article:
The parts ...
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27 Directional Lights Celebrate 2024
Let us celebrate the start of 2024! (1 month late...)
Direct each light (yellow) such that all unlit squares (white) are lit. Walls (black) block light from going through.
Some clarifications of the ...
- 3,185
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One more Colombian Sudoku
Here is one more Colombia Sudoku devised by Xavier Castillo. The usual sudoku rules apply.
The dots outside the board above indicate how many cells in the corresponding column or row of that board ...
- 19.3k
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Creeper Lighting
There are two sets of similar but separate puzzles here; the white puzzle (with white cells) and the black puzzle (with black cells). Each puzzle is solved independently.
Each number is a "...
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