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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You go wherever you go today
A conclusion to my entries in the Fortnightly Topic Challenge #32: Grid Deduction Hybrids. This metapuzzle incorporates the three previous puzzles in this series:
Desert Irrigation Project
I am an ...
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This new puzzle type needs a name {3}
I believe I have invented** a new type of puzzle...
What is its name?
** Well, 'adapted' an existing one, really...
Colour-blind-friendly version available here. Those without colour-blindness ...
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Captain Pun's new boat
My good friend Captain Pun has bought a new boat.
"And this is a picture of its sail!" he said, showing me this:
"Solve the nonogram and you'll soon know what type of boat it is!"
Can you solve ...
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My Uncle's Music Box
Unfortunately, my favorite uncle just passed away. He's the one that taught me all about puzzling, and supposedly found Davey Jones' treasure in his youth. I miss him very much, however, I just ...
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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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Tribute to Clifford Possum Tjapaltjarri
The background text that follows is in this case not part of the puzzle, nor fictitious. The puzzle, which is self-contained, consists entirely of the image below; I have composed it as a genuine (...
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A flag-packing problem
An entry in Fortnightly Topic Challenge #45: Flags
You are provided with a 9x9 grid of squares and 21 minimalistic flags (pictured below, all shown to scale).
TASK: Assign a colour (Black, Blue, ...
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Curiouser and Curiouser
CHAPTER ONE
Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do: when she was overcome with the strangest sense of deja vu, and saw a 7x3 grid of ...
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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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Orange on Turquoise
This is part 50 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Dear Puzzling,
This is a Beaches puzzle (or tricolour Aquariums, if you prefer). Shade some cells ...
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The disappearance of Beastly Gerbil
Part 2: The entrapment of Beastly Gerbil
Part 3: The escape of Beastly Gerbil
This is an unusual call in. As a private detective you have been asked to investigate several odd cases, but this you're ...
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Popularity Within a Target Audience
This is a metapuzzle with four component puzzles and a final meta.
Creations of CSIRO
The Australian research institute CSIRO is notable for producing inventions such as gene shears, the insect ...
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HAISU (Room Count): An original grid-logic challenge
HAISU is a portmanteau of three Japanese words - 'hairu', to enter, 'su', number, and 'hausu', an English borrow word meaning house, of course.
Together, we get a meaning of 'enter number house', ...
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Hey, This is a 100th Puzzle of Mine!
Yep, this is my 100th puzzle here in PSE~
I'm really having a wonderful time here, thank you so much guys! ><
I planned to write a harder and bigger one, but it turned out I was too lazy to do that....
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A Puzzling Sudoku (Warning: Hot!)
An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus"
A Sudoku with an oddly familiar shape. Here's a Penpa Link.
Rules:
Normal Sudoku rules apply
(Special) Thermometers:
The ...
27
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1
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Slitherlink: Around the W0rld
Rules of Slitherlink:
Connect adjacent dots with vertical or horizontal lines to make a single loop.
The numbers indicate how many lines surround it, while empty cells may be surrounded by any number ...
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Another new puzzle type needs a name
For an example of how this type of puzzle works, see here...
I believe I have invented another new type of puzzle...
What is its name?
Colour-blind-friendly version available here.
Begin by ...
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What is this puzzle?
$$\huge\text{This puzzle is _______}$$
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Untitled, for Now
As you step into the gallery, you notice an interesting piece of art hanging on the wall.
"I like the piece, but what's with the title?" you ask the docent. "I'm used to obscure titles in modern art, ...
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A Minesweeper Sudoku
My brother created this puzzle, and he wanted me to post this here.
Each 3x3 box contains three mines (those squares also have numbers in them). There are no mines in boxes containing a 1, 2, or 3. ...
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Stingray Nebula
An entry in Fortnightly Topic Challenge #35: Restricted Title 1. Inspired by the title of this xkcd comic, but in no way related or affiliated beyond the shared name.
This is the stingray nebula:
...
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Sudoku in the third dimension (3D Sudoku)
People seemed to enjoy my last Sudoku variant puzzle - Samurai Pseudoku, so I spent this week making another! This one is going to require using logic you've never used before...
The last one was a ...
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a few signposts
Assign an integer (1 through 16) to each cell so that:
16 is in the cell with the star; and
each integer's arrow points to its successor (i.e. the next integer), though not necessarily in the ...
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This new puzzle type needs a name {6}
I believe I have invented** a new type of puzzle...
What is its name?
Begin by solving the Fillomino puzzle:
Rules of Fillomino (adapted from Nikoli)
Fill in all empty cells with numbers under the ...
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Help! Can you get my puzzle back?
Puzzling has a lot of really complicated stuff these days, so I just wanted to post a simple Boggle grid.
You know that game, right? You form words by starting from one letter, then taking adjacent ...
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Sudoku in Technicolor!
An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus"
This puzzle consists of three overlapping Sudokus, coloured red, blue and green, so each cell will contain three digits, one of ...
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The Blank Sudoku
An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus"
(h/t to Beastly Gerbil, whose 1,2,3... Trinary!!! puzzle provided inspiration for this puzzle)
This puzzle is a normal Sudoku, ...
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Can you create a free-floating MASYU puzzle?
Rules of MASYU, for those unfamiliar: https://www.gmpuzzles.com/blog/masyu-rules-and-info/
Hey guys! So I just discovered this really cool puzzling site called the Puzzling Stack Exchange (puzzling....
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Encrypted Snake (Grid Puzzle)
Rules of Snake:
Shade some cells to form a non-intersecting path which does not touch itself, not even diagonally.
Black circles must lie on one end of the path. White circles must lie somewhere ...
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3D nonogram, beginner's edition
Trying out the concept of 3D nonograms. This one should be pretty simple.
Name the depicted object.
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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 ...
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Introducing: Compoundoku!
Rules of Compoundoku:
Solve both left and right Sudokus.
In addition, the board below them is the Compound Board of both Sudokus.
Each number on the Compound Board should tell either: (1) ...
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New logical puzzle
The goal is to divide the grid into regions of exactly four cells (tetromino). Each region contains exactly two different symbols. Regions of the same shape must contain the same symbols. The ...
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Chess Connect Puzzle
I made up a new logic puzzle based on the games Numberlink and Chess, and thought it ended up rather interesting. The solution, as usual, is unique.
The starting and ending positions of 7 chess ...
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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 ...
23
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1
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Polly O'Mino's Hexcellent Adventure
An entry in Fortnightly Topic Challenge #52: Polyominoes.
I had heard that my good friend Ingrid Deduction was back in town, so I popped round to her apartment today, only to find she'd got herself a ...
23
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This puzzle design was a DISASTER!
As any member of the PSE community knows, grid-deduction puzzles really aren't my forte.
In fact, I'd like to share one particularly disasterous attempt at designing a Slitherlink puzzle.
Disclaimer:...
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Statue View: Tetrominoes
This is a Statue View puzzle, an original invention combining two logic puzzle genres: Statue Park and Canal View.
Rules of Statue View:
Shade some cells of the grid to form the given set of pieces. ...
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Statue Park: Knight's Lines
This is a Statue Park puzzle.
Rules of Statue Park:
Shade some cells of the grid to form the given set of pieces. Pieces may be rotated or reflected.
Pieces cannot be orthogonally adjacent (though ...
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Snakes and Adders - A New Grid Puzzle
So, literally last night, I dreamt of this new grid puzzle genre, so I'm just giving it a shot...
Rules of Snake and Adders:
Put some snakes into the grid on the white cells.
Each snake forms a ...
23
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2
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Slightly Odd Sudoku
Someone I find very trustworthy continues to insist that this is a valid Sudoku board. It's been a while since I've played, but surely there's a couple of things off here, right?
Alright, so that ...
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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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Complaint at the PSE lounge
While walking through the PSE lounge, I noticed a piece of paper on one of the tables. Picking it up, I saw several things. The first, was a couple of sentences at the top:
I love this place! But ...
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Heyawake: An Introductory Puzzle
This is a Heyawake ("divided rooms") puzzle.
Rules of Heyawake:
Shade some cells of the grid.
Shaded cells cannot be orthogonally adjacent; unshaded cells must be orthogonally connected.
...
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Introducing Domidoku!
Come one, come all!
Come see the new type of logic puzzle, the Domidoku!
Here's a sample for all to try!
The process is simple!
First you solve the Sudoku and then you solve the Dominosa!
...
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Snakes on a Plane! 2
An entry in Fortnightly Topic Challenge #35: Restricted Title 1. Inspired by the title of this xkcd comic.
Snakes ... on a plane ... again ...
This time 2 specimens of a huge unknown type of snakes ...
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The Metaslitherlink
This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks.
Below is a grid containing multiple small slitherlinks. These can be independently solved to form clues for the large ...
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Sudoku.... On your keyboard?
Tired of solving Sudokus on paper? Look no further! The solution is, literally, under your nose.
Why use a 9x9 grid, when you can use your own QWERTY keyboard!
RULES:
Fill each row with the numbers ...
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The Tree is Growing
I just found this new type of puzzle and I think the rule set is fun! So, I decided to create one.
Rules (taken from the original puzzle):
Create non-intersecting non-looping trees such that the ...
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Another Straightforward 4-letters Crossword?
This is an entry for Fortnightly Topic Challenge #43: Variety Crossword Grids.
Across
4. "___ and on"
5. "La ___" light
6. Aside from it
8. Diagonal
10. Firefly
12. Clothes shop
...