# 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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### What technique can be used to solve this 6x6 sudoku?

Which Sudoku technique can be used to solve this? The screenshot is from the open source Sudoku app by SECUSO (Security Usability Society) for the Android platform.
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### PSE Advent Calendar 2023 (Day 3): 24 dangerous doors

This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2023. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door > Task: Solve ...
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### What is the next logical step I can take when solving the Nov. 30 2023 Sudoku in the Wisconsin State Journal?

Note: sorry for posting this on Dec. 1, but don't worry, I haven't looked at the Sudoku solution yet. So today I decided to try to solve the Sudoku in the Wisconsin State Journal. Now, even though ...
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### Turn Back the Clocks

This is part 45 of the puzzle series Around the World in Many Days. Each part is solvable on its own. Dear Puzzling, This is a Slitherlink puzzle. Draw a single continuous loop along grid lines that ...
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### Is the "Challenging" Kenken in the Wisconsin State Journal from April 27 2021 solvable?

Note: The reason that I picked this one to self-answer was because it was a few weeks (months?) before the Wisconsin State Journal stopped printing Kenken puzzles. This was also the newest Kenken from ...
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### Filling in an 8x8 minesweeper grid with mines (Day 11: Christmas tree edition)

Previous puzzles Contains: Single mines (1 mine), Double mines (2 mines), Triple mines (3 mines) To get the $\color{green}✓$: Solve the Nonogram Solve the Minesweeper puzzle Note: partial answers ...
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### Sudoku variants #2: Lined Numbers (6x6 grid)

Previous variant Today's Sudoku variant is a bit weird. Here's why: Take this screenshot: From this, you might argue that there is nothing that can be logically deduced on this grid. Now you might ...
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### Filling in an 8x8 minesweeper grid with mines (Day 10: Double Neighbors)

Previous Minesweeper puzzles Based off of Day 10 of the Minesweeper Advent Calendar on heptaveegesimal.com Difficulty (approximate): ★★★★☆ Contains: Single mines (1 mine), Anti-mines (-1 mines), ...
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### Another puzzle combination (feat. Kakuro)

Today, I am going to give you another puzzle combination. This time, it features a Kakuro! However, there are some things to note: There are only two puzzles that I have combined, although you have ...
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### A Hokuro, but with a twist!

Recently, I created my first Hokuro puzzle, which was received really well. However, this time, there is a twist! Not with the rules or anything, however, it is combined with a Nonogram! Luckily, the ...
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### A 6x6 table with nothing filled out?

So as you might or might not know, I can be quite evil sometimes, especially with my Hidato puzzles that contain no numbers. But, today, I decided to give you an enigmatic-puzzle! This means that you ...
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### Anyone up for a 3x3x3 Hidato?

So, I have been pretty evil with how I make Hidato puzzles lately, with there being no numbers. To make up for it, I have decided to make a 3x3x3 Hidato for you all. Yes you read that right. I made a ...
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### How would I be able to solve this difficult Hidato?

So I was doing Hidato puzzles on the official Hidato site when I came across this puzzle that I am having trouble solving, and while I have been able to solve it partly, I don't think that I'm going ...
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### A Hidato, but with no given numbers? #2: 5x5

Previous puzzle As you may or may not know, I can be a bit evil sometimes. Today, I am going to give you a 5x5 Hidato with no given numbers to start. However, this isn't a Mobius Strip puzzle like ...
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### A Hidato, but with no given numbers?

I can be a bit evil sometimes. Today, I am going to give you a Hidato with no numbers! It gets worse: This puzzle is on a Mobius Strip Y[1] However, I will give hints as to what the numbers are, so ...
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### Feedback on a themed Nonogram/Hidato puzzle combo with a cell color gimmick

So, as you might know, the Christmas season is coming up. (17 days until Dec. 1 at the time of writing) I'm thinking of posting some Christmas-themed puzzles during that season, and just want some ...
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### A Hidato, but with a complex twist!

Today's Hidato puzzle has a pretty complex twist. What is the twist, you ask? This is what the twist is: There are three different colors: Yellow: Represents a prime number Green: Represents a ...
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### Double Choco: Snaking

Rules of Double Choco: Divide the grid into rooms along grid lines. Each room contains two halves: one orthogonally connected area of shaded cells and one orthogonally connected area of unshaded ...
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### How to create a big, but good Hidato puzzle?

The goal of Hidato is to fill the grid with a series of consecutive numbers adjacent to each other orthogonally or diagonally, and all tiles are required to be filled in. So, as you may or may not ...
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### My first puzzle combination: A Nonogram and Hidato

Today's puzzle is a bit strange. Why, you might ask? Because it is a Nonogram and a Hidato combined! Rules of Nonogram: The grid must be colored or left blank according to numbers at the side of the ...
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### A fun and simple Nonogram... ...with a cipher

Goal of this puzzle: Find the hidden message in this Nonogram that I created. The puzzle: play online Hint:
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### Touching Base (Checkered Fillomino)

This is a Checkered Fillomino puzzle, with the following rules (adapted from the linked page): All numbers on the grid must be part of a polyomino of the same value. No two polyominoes of the same ...
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### A (maybe) simple Hokuro puzzle

Hokuro is a puzzle that was introduced to the Puzzling Stack Exchange on December 2nd, 2020 by sarsapilla as an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the ...
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### Sudoku variants #1: Schrödinger's Grave (6x6 grid)

Not in conjunction with my Minesweeper puzzles - that would be concerning! Inspired by Cracking The Cryptic's video "The Graveyard Of Schrödinger" (original gimmick by fjam) How this ...
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### A 10x9 Hidato puzzle with a cipher

rot18(A se zgfwkldq jwsddq tsv sl ujwslafy hmrrdwk kg zghwxmddq sl kgew hgafl A sulmsddq kzgo aehjgnwewfl dgd) You might note that something is off about the following Hidato puzzle. Well, I guess in ...
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### Filling in an 8x8 minesweeper grid with mines (Day 9: Complex mines)

Contains: Complex mines ($i$ mines, where $i:=\sqrt{-1}$), Anti mines (-1 mines) Note: This is in conjunction with my Minesweeper puzzles Sorry for not posting a Minesweeper puzzle yesterday. I will ...
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### A 4x4 sudoku shouldn't be that hard, right? Right?

Note: this is not in conjunction with my Minesweeper puzzles Got this idea from one of Cracking the Cryptic's videos, I don't remember which one though. This exact puzzle is still overall unique. ...
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### An introduction to Hidato (also known as Hidoku)

Note: this is not in conjunction with my Minesweeper puzzles In all honesty, I don't know why I decided to look up this type of puzzle since I also have never heard about it, and there doesn't appear ...
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1 vote
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### Filling in an 8x8 minesweeper grid with mines (Day 8: Not a single mine)

Difficulty (approximate): ★★★☆☆ Contains: Double mine, triple mine Now you might be wondering: If this puzzle contains not a single mine, then why does it contain mines? Well, that's because there ...
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### Filling in an 8x8 minesweeper grid with mines (Day 7: Double Mines)

Note: This uses anti, single, double, and triple mines Yes, I realize that when I uploaded Day 6, I mentioned in the disclaimer that I planned for this to be released tomorrow, along with Day 8, ...
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### Filling in an 8x8 minesweeper grid with mines (Day 6: Anti-Mines - A better introduction)

Disclaimer: ascii85(Z85 (ZeroMQ) encoding)(...
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### Filling in an 8x8 minesweeper grid with mines (Day 5: Mod 4)

Disclaimer: ascii85(z85 (Zero MQ) encoding)(...
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### Filling in an 8x8 minesweeper grid with mines (Day 4: Looking Up)

We have a sort of weird condition for the tiles today. What is that, you ask? Well, we actually have 2: The visible neighbors are different. Here is what they will be for today (the "x" ...
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### Filling in an 8x8 minesweeper grid with mines (Day 3: Zen Garden Intro)

This day is inspired by Day 20 of the Minesweeper Advent Calendar on heptavegeesimal.com rot13(ab jnl! vzntrf jbex ba gnoyrf! :Q) okay hopefully this is my easiest Minesweeper puzzle so far Today we ...
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### The temple of tourists and tables

11 tourists are standing in an ancient temple (6x6 grid). The temple contains 16 stone tables. Each tourist is facing either north, south, west, or east and sees a different number of tables. The ...
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### Filling in an 8x8 minesweeper grid with mines (Day 2: Diagonal Reverse Synesthesia)

Note: This is based off of Day 30 of the Minesweeper Advent Calendar on heptaveegesimal.com So my first minesweeper puzzle did not go so well. I will try to do better today. First off: This is a torus ...
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### Filling in an 8x8 minesweeper grid with mines (pt. 1: Rectangle)

Can you detect where the mines are in this 8x8 Minesweeper grid containing single, double, triple, and anti-mines? 1 3 4 -1 21 5 3 1 9 3 -1 3 -5 -4 -3 13 4 5 20 12 5 5 Notes: Anti-...
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### Symmetries – a Quadritaisho puzzle

This is part 43 of the puzzle series Around the World in Many Days. Each part is solvable on its own. Dear Puzzling, This is a Quadritaisho puzzle. Divide the grid into rooms by drawing borders along ...
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My friend from America was going to watch a game and wanted to bet I couldn't guess where he was going. The answer lies in the Quadritaisho puzzle below. Can you help me find out where he's going to ...
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### Help me with Slitherink puzzle (honeycomb) solution

I got stuck on this level (Honeycomb/Large/Hard/#12) and I always end up having issues with the part that I circled with red because it either wouldn't add up or there would be a space that's not ...
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TL;DR: Nikoli's Tentai Show, but with four different types of symmetry. Rules of Quadritaisho: Divide the grid into rooms by drawing borders along grid lines. Each room contains exactly one symbol (...
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### Multi smol boi puzzle I: apologies

Disclaimer: Jryy, svefg bs nyy, V jbhyq yvxr gb ncbybtvmr. Abg sbe npgvbaf (jryy bxnl, sbe npgvbaf), ohg sbe zl fzby obv pvcure. Vg frrzf gung zl svefg fzby obv chmmyr jnf whfg n ovg gbb uneq. Fb, gb ...
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### A Trivial Pursuit #19 (Geography 4/4): Glass

This is part 19 of A Trivial Pursuit, a 25-part puzzle hunt. Each part is solvable on its own, with the exception of the meta-puzzle at the end. Front of menu card: STIV'S SPEAKEASY COCKTAILS BOUR....
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### SlitherLITS revisited - Do colour outside the lines

This is a follow-up to SlitherLITS: Don't colour outside the lines After creating that puzzle, I've been wondering whether it was possible to create a SlitherLITS puzzle where all the regions outside ...
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### Colourful Scenery

This is part 41 of the puzzle series Around the World in Many Days. Each part is solvable on its own. Dear Puzzling, This is a Word Nurikabe puzzle. Shade some cells in the grid. Shaded cells must ...
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### Another nonogram with story

Another nonogram with story but this time it's ZEBRA type. Clues in darker color describe what should be marked as FILLED. Clues in lighter color describe what should be marked as BLANK. After my ...
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### A Trivial Pursuit #12 (Sports and Leisure 2/4): Logic Boat

This is part 12 of A Trivial Pursuit, a 25-part puzzle hunt. Each part is solvable on its own, with the exception of the meta-puzzle at the end. This is a variation on a Battleships puzzle, where the ...
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This is part 40 of the puzzle series Around the World in Many Days. Each part is solvable on its own. Dear Puzzling, The puzzle on the left-hand side is a regional Yajilin. Shade some cells in the ...
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### What kind of puzzle is this?

Hello, I found this puzzle in an old puzzle book, it's fun. Does anyone know if this kind of puzzle has a name, I want to find more, and maybe try making some. Thanks very much! Here is the cover of ...
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