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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Singles, Doubles, Triples
This is part 20 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Dear Puzzling,
The circled numbers in this grid form a Kurodoko puzzle. Shade some cells in the ...
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1
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Can experienced players tell when a Sudoku was randomly generated? Or if it's a shuffled version?
I'm trying to make a simple classic Sudoku game in JavaScript, and I'm wondering what considerations I should have in how experienced players might interpret the generated puzzles. I'm not very ...
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2
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Hard Sudoku: hint for next number
I tried a hard sudoku and I can't figure out what the next number is. I tried some online tools without any success (I don't want to have the final solution without any explanation).
I would be very ...
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Layers upon Layers
This is part 19 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Dear Puzzling,
This time I have a Suraromu puzzle for you. The grid contains seven “gates”, ...
- 77.8k
10
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1
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Boulders in Valleys - Magnetic Confinement
This is a "Boulders in Valleys" puzzle - it's been posted a few times on this site. This specific puzzle's solution has an interesting property that made it quite hard to design. The ...
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14
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Sneaks and Addlers
This is part 18 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Deаr Puzzling,
This is an I Have No Idea What I’m Doing crossword. The clues are a mix of 10 ...
- 77.8k
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vote
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Explanation why next cell has to be a certain value
I'm an absolute beginner and was stuck at the first puzzle of Sven's Sudoku Pad. I reached the following board state, where I noted for every cell which values were possible:
After a while I simply ...
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Paranormal Activity
This is part 15 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Deаr Puzzling,
The numbers in blue here form a Nurikabe puzzle. Shade some cells in the grid so ...
- 77.8k
10
votes
1
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Coasting Along the Coast
This is part 14 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Deаr Puzzling,
The larger grid is a Fillomino puzzle. Each of the six different letters in the ...
- 77.8k
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Under the Surface
This is part 13 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Deаr Puzzling,
The first grid is a kakuro puzzle. Fill the grid with the numbers 1–9 so that ...
- 77.8k
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Many Moons (and Suns) Ago
This is part 12 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Many moons ago, on an island far, far away…
Deаr Puzzling,
Today I have a Moon-or-Sun puzzle for ...
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2
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What's the next step to solve this Nonogram?
I've gotten myself stuck in this Nonogram level using the logic I'm familiar with (filling in our crossing out boxes that will always be filled in or empty no matter how you fill in the grid). And ...
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Why can't a 1 go in this field
I've moved onto "expert" sudoku's in my app (Sudoku.com on IOS) and whilst I am getting by solving some, others I'm having a hard time with.
With this one, I used a hint so the AI could note ...
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Horological Horrors
This puzzle is part of the Monthly Topic Challenge #6: Is it really that [time] again?.
I was visiting my grandfathers workshop one day, when he received a call and had to run out for a bit. He told ...
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Next step in this Slitherlink puzzle (Honeycomb)
I have applied all of the techniques that I know of, and can't figure out the next logical step. I even turned on the visual clues, but it didn't help.
What would be the next move without resorting to ...
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The Key to the City
This is part 9 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Deаr Puzzling,
This is a Skyscrapers puzzle. Each letter represents a unique number between 1 and ...
- 77.8k
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Trust me: you do not want to go down this road with me
Every cell has a digit from 0 to 9 or one of the four operation symbols +, −, ×, and /, signifying addition, subtraction, multiplication, and division respectively.
No digit appears more than once in ...
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How to make gifs showing a puzzle's solution process?
I've been repeatedly asked to turn this into a PSE question, so here goes.
Some people may have noticed that, when I answer a grid-deduction question, my answer often includes, as well as a step-by-...
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"Symmetric" Tetrikabe
This puzzle's theme is inspired by one from Grandmaster Puzzles' "The Art of Puzzles", but the puzzle itself is original.
Rules: (Nurikabe section shamelessly stolen from an earlier puzzle ...
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Kings of Centuries Past
This is part 7 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Deаr Puzzling,
This time I have a shingoki puzzle for you. Draw a single loop that passes through ...
- 77.8k
14
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1
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Who’s in for a Cruising?
This is part 6 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Deаr Puzzling,
Looks like I’m getting way behind schedule already. Sorry about that! Time flies ...
- 77.8k
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2
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Boulders in Valleys
This is a "Boulders in Valleys" puzzle (previously called "Balls on Hills"). It's similar to Slitherlink and Corral; your goal is to draw a path along grid cell edges that ...
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Happy 2023! Another empty Suguru (Tectonic)
Another assignment for the Suguru (Tectonic) fans out there.
Fill in a number in each empty square so that:
Each block of n squares has the numbers 1..n.
Neighbouring squares are not be equal (...
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Balls in Pockets (Balls on Hills)
This puzzle is a "Balls on Hills" puzzle. It's similar to puzzles like Slitherlink in that your goal is to find a curve given some clues. The intuition behind this puzzle is balls rolling ...
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How do I transcribe a Masyu into a Google Sheets?
I received some PDF puzzle books for Christmas and have been solving them in a Google Sheets. The basic tools of borders, background colors, and entering numbers work for lots of genres (Nurikabe, ...
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Balls on Hills - Loop Deduction Puzzle
This puzzle is a loop deduction puzzle, like Slitherlink and Masyu. It is based on the idea of balls rolling down hills - the clues here give the distance that a ball can roll down.
The Puzzle
...
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2
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How many Nonconsecutive Sudoku solutions are there?
Consecutive Sudoku is a variant with the additional rule that orthogonally adjacent numbers are consecutive if and only if there is a dot/bar on the line between them. A Nonconsecutive Sudoku is one ...
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Right turn only puzzle
Here is a grid with 24 spaces filled with letters.
Pick any place to start your travel in the grid taking right turns only. You must get to all remaining 23 spaces but only once. By doing so create a ...
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From Before Caesar
This is part 4 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Deаr Puzzling,
How have you been? I hope you don’t mind me showing up a little early this time ...
- 77.8k
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PSE Advent Calendar 2022 (Day 20): The Christmas Gift
This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2022. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door >
Alice and ...
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Unsure how to continue Sudoku solve/apply Y-Wing strategy
I am not new to solving a sudoku board, but I do not have a lot of experience with harder boards and more advanced strategies (I am able to solve a "hard" board in under 10 minutes, on ...
- 1,309
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PSE Advent Calendar 2022 (Day 18): Light Up the Christmas Tree
This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2022. The accepted answer to this question will be awarded a bounty worth 100 reputation.< Previous Door Next Door >
The year ...
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Help to solve Star Battle puzzle
I've solved a number of Star Battle puzzles, but once in a while some of them seem much harder than others. This has also been noted earlier here.
It seems as if I'm missing some technique to be able ...
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Empty suguru (tectonic) puzzle
Suguru (also knows as Number Blocks or Tectonic), is a popular type of grid-deduction puzzle:
In a rectangular grid of squares, the squares are grouped into blocks. As with a sudoku, some squares ...
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PSE Advent Calendar 2022 (Day 6): Christmas and Squares
This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2022. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous DoorNext Door >
Today's door ...
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PSE Advent Calendar 2022 (Day 5): The Double Slitherlink Experiment
This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2022. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous DoorNext Door >
'Twas the ...
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Around the World in Many Days
Deаr Puzzling,
How have you been? I am excited to tell you about my new trip. It’s my most ambitious one yet – a full trip around the world! I will definitely keep you posted about my whereabouts. I ...
- 77.8k
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PSE Advent Calendar 2022 (Day 2): Santa’s Magic Knapsack
This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2022. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door >
Have you ...
- 77.8k
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PSE Advent Calendar 2022 (Day 1): A festive Sudoku
This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2022. The accepted answer to this question will be awarded a bounty worth 50 reputation.Next Door >
Rules:
Normal Sudoku rules ...
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A logician's Bingo
Mark some cells on the following Bingo board, so that all statements in marked cells are true AND all statements in unmarked cells are false.
A Bingo here is a set of five marked cells in a row, ...
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0hn0: is this correct deduction?
Starting with:
Text:
.....9..6
....3.2..
6.5....2.
.7.6..R..
...7R....
..R.R.6..
5.....5..
..4..2...
.9...1.1.
We soon get to this:
Text:
...
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Find the carpets
This room has been filled with carpets, thirty of them. Each has a number inside precisely equal to its area. Find the carpets!
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Chain Puzzle: Video Games #02 - Fish Is You
This is the second Chain Puzzle in the Video Games series, in which all puzzles are themed around video games of all genres. The answer to this puzzle is a thematic word or phrase. The solver whose ...
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This new puzzle type needs a name {7}
This puzzle is part of the Monthly Topic Challenge #5: On-and-onograms - and also extends the 'This new puzzle type needs a name' series...
I believe I have invented a new type of puzzle...
What is ...
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Stuck on hard Kakuro
I‘m stuck on this Kakuro. Does anyone have any hints how to proceed? Thanks!
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Make a wide rectangle out of T-Pipes without loops
Inspired by Pipes.
This is a T-Pipe
A T-Pipe connects to 3 adjacent cells.
This is a 2x2 square containing only T-Pipes.
I call the square above is a valid arrangement, because it fulfills the ...
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Question about a minorly used tag
There once were sixteen chairs.
Next to orthogonal.
There are people wearing only black or only white.
[REDACTED]
A black-wearer is in the corner.
A white-wearer is next to a black-wearer.
At least ...
user79541
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The woefully underclued crossword
This puzzle is part of the Monthly Topic Challenge #4: Cross-*non*-words
Giving clues for everything makes things way too simple. In this crossword, four clues are not given and you must find a way ...
- 77.8k
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Crossword by name, crossword by nature
This puzzle is part of the Monthly Topic Challenge #4: Cross-*non*-words
Here's a crossword puzzle - in fact, here are two of them - with a twist. Every entry in the two grids below contains the 5-...
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