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. 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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24
votes
2answers
480 views

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. ...
9
votes
1answer
189 views

Fill this Rangoli puzzle

I came up with this puzzle named Rangoli, which was a part of the Puzzle Ramayan, the qualifiers for Indian Puzzle Championship. Rules Every cell must contain one of the four letters ...
17
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2answers
565 views

What Masyu do with the antique clock?

Anagram is needed, and it will answer: What Masyu do with the antique clock?
13
votes
1answer
230 views

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 (...
13
votes
1answer
532 views

A Puzzle in The Two Towers

Our local used book store is going out of business, and I ran in to pick up another copy of Lord of the Rings. When I picked up a likely copy, a scrap of paper fell out of The Two Towers...I've done ...
12
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1answer
619 views

Stuck on a Nonogram puzzle

Help is needed. I have been stuck on this puzzle for some time. Any help or tips would be appreciated.
-2
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2answers
241 views

Battleship puzzle with no clues

Suppose I have a standard Battleship Puzzle, but with no clues (no square uncovered) at the start. Then I'm given 5 "fires" that uncover a square, what would be the best strategy to chose a square to ...
26
votes
1answer
1k views

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....
5
votes
2answers
566 views

Multiplicative sudoku (don’t use computers please)

If I place all the numbers from 1 to 9 in a 3x3 grid and I add the products of each row and column, then what is the minimal and the maximal sum? For example, the sum is 450 on the picture above
15
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3answers
314 views

Curve Data: A-hint for A-thin

I just recently know about Curve Data puzzles from Logic Masters India. Here I tried to write two simple puzzles to introduce them to you. They should be easy though as I still can't write a harder ...
23
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2answers
1k views

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 ...
16
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2answers
499 views

HAISU: One Piece

This is a Haisu puzzle. Draw a path from S to G passing through all cells exactly once by connecting the centres of adjacent cells, such that when the path passes over a number N, it is on its Nth ...
14
votes
2answers
434 views

(Indonesian) Fill-In Puzzle

I made this seasonal puzzle to celebrate the upcoming Eid al-Fitr in Indonesia. So actually there are four thematic hidden phrases that can be found after solving the puzzle. But because they are ...
8
votes
2answers
271 views

Another follow the path of relation through the grid

Inspired by Galen's series of puzzles...there is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-...
4
votes
1answer
75 views

Follow the path of relation through the grid #9

There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can ...
3
votes
1answer
90 views

Follow the path of relation through the grid #8

There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can ...
4
votes
1answer
139 views

Follow the path of relation through the grid #7

There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can ...
4
votes
1answer
104 views

Finding the Missing Word in a Crossword

On each of the 25 cells of this board, place one of the letters A, C, M or S so that, in alphabetical order, nine of the ten words that can be read down or across are the following: AACAC AMCAS ...
5
votes
1answer
83 views

Follow the path of relation through the grid #6

There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can ...
5
votes
2answers
166 views

Follow the path of relation through the grid #5

There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can ...
3
votes
1answer
97 views

Follow the path of relation through the grid #4

There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can ...
13
votes
2answers
664 views

Sudoku variation: Using various chess moves, solve the grid from just two numbers

I've been watching a youtube channel hosted by puzzlers and attempting the sudoku variation they post each day. Today's I found particularly interesting and while sharing it around it proved quite the ...
6
votes
1answer
151 views

Follow the path of relation through the grid #3

There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can ...
7
votes
1answer
174 views

Follow the path of relation through the grid #2

There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can ...
13
votes
1answer
253 views

Follow the path of relation through the grid #1

There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can ...
4
votes
1answer
124 views

Smudged Sudoku - help me solve it!

One late evening I was making my sudoku. I finally finished until water spilled all over the middle-right block. The only thing I remember is the numbers present in the block (but not their position):...
8
votes
1answer
204 views

Puzzle of the day - Sudoku Rossini

The arrows outside the grid indicate that the nearest three digits in the corresponding direction are in ascending or descending order (the highest number is always in the direction of the arrow). All ...
9
votes
2answers
947 views

Sudoku Help: Hard

I am unable to finish this Sudoku. All numbers are verified by the app. I'm sure there must be a way to solve this without guessing. Even an online tool couldn't tell me a next number.
9
votes
1answer
235 views

Simon Tatham's Gokigen Naname

Lately, I've been interested in Gokigen Naname a.k.a Slalom a.k.a Slant. Luckily, Simon Tatham has a generator for Slant. Usually, the generated puzzle is so-so, but this particular generated puzzle ...
19
votes
2answers
941 views

Tic tac toe - Sudoku: A variation in which the centre box defines the layout of the other boxes

I stumbled across this interesting variation of Sudoku the other day and thought I'd give it a try, it has however baffled me and I've been unable to progress past the very early stages. The puzzle ...
7
votes
1answer
206 views

Catch 21: Lies in Advertising

I posted a few Dominosa puzzles this week to celebrate adding Dominosa to my Donimoes collection of domino puzzles and games. Now, I want to finish the week with something a little different. What ...
2
votes
1answer
68 views

Zed's Mystery: Thetis… Vanished into Thin Air!

My friend Thetis and I cons— wait, where's Thetis? Hmm, that's funny... she was here a minute ago.... Wait, a note!... Oh dear, it seems things have taken a turn from bad to worse; Thetis is ...
7
votes
2answers
196 views

Friday's Dominosa Problem

Dominosa is a logic puzzle with a similar feel to Sudoku, and I've recently added it to Donimoes, my collection of domino puzzles and games. Given a grid of numbers, you have to lay out the dominoes ...
10
votes
1answer
249 views

How do I construct a Japanese-style “grid deduction” puzzle? [duplicate]

Logic puzzles like Nurikabe, Slitherlink, and Battleships -- the ones we call grid-deduction puzzles -- can be a lot of fun. How do I go about constructing them? What's the best strategy for making ...
5
votes
1answer
167 views

Shingoki: Choices

This is a Shingoki puzzle. The goal is to make a single loop in the grid which satisfies the following rules.1 The line passes through dots and numbers in the grid, vertically and horizontally, ...
8
votes
2answers
283 views

Have you heard Gokigen Naname?

Here is a regular Gokigen Naname a.k.a Slalom a.k.a Slant puzzle. An online (mobile-friendly) version is available here. Rules: Put a slash (diagonal line) on each cell. Each number ...
13
votes
1answer
440 views

Tapa - Confluence

This is a Tapa puzzle. Rules of Tapa: Shade some cells of the grid. Shaded cells should form a single [orthogonally] connected group; no 2×2 square should be fully shaded. Some cells have ...
9
votes
2answers
200 views

Wednesday's Dominosa Problem

Dominosa is a logic puzzle with a similar feel to Sudoku, and I've recently added it to Donimoes, my collection of domino puzzles and games. Given a grid of numbers, you have to lay out the dominoes ...
5
votes
2answers
160 views

Monday's Dominosa Problem

Dominosa or Domino Solitaire is a logic puzzle with a similar feel to Sudoku. Given a grid of numbers, you have to lay out the dominoes so they match the numbers, without duplicated or missing ...
2
votes
1answer
91 views

Next move for Sudoku puzzle

I am currently stuck at this point in the below Sudoku puzzle. What is my next move and why? Thanks!
10
votes
3answers
692 views

Cipher text on an ancient wall

The following text was found written on the wall of an ancient tomb: $\text{DXFDMKEPU}$ Can you decipher what it means? Nearby the wall, this piece of parchment was found. Perhaps it is a clue ...
10
votes
2answers
884 views

Reverse minesweeper?

The puzzle below, when filled out completely, is a valid minesweeper board. Some of the mines and numbers have already been filled in. Can you fill in what is missing and use the solved grid to find ...
7
votes
2answers
170 views

What Goes Round (Begriddled logic puzzle)

Join adjacent numbers in the below grid to reveal the hidden content. The rules are: 1: Join all pairs of vertically and horizontally adjacent numbers that are the same. 2: Join all pairs of ...
15
votes
1answer
353 views

“Is dot a fact?”

You're presented with a five-by-five grid of dots. Each dot is assigned a label from 1 to 25 going across the rows and down. Thus, the top-left dot is number 1; the bottom-left dot is 21. Your job ...
9
votes
2answers
442 views

Can you solve this grid?

I'm not completely sure there is enough information here to solve these puzzles, if not I'll add hints until someone solves it. Rules: The numbers $1$ to $12$ appear once each. The numbers on the ...
2
votes
2answers
207 views

Logical Sudoku - How to tell when fully deducted?

I'm working a program that should generate bad ass sudoku puzzles. Recently I noticed there's a thing called "logical sudoku", which means it can be logical-deducted all the way to solution. The ...
5
votes
2answers
512 views

I'm stuck on this game of Slitherlink

I'm stuck on this game of Slitherlink. What deduction (or deductions) can be made from here? Am I missing something obvious? I verified that everything I have so far is correct by looking at the ...
9
votes
2answers
380 views

A Sincere Slitherlink Puzzle

So here's a standard Slitherlink puzzle. Feeling Déjà vu? Rules (adapted from Nikoli): Connect adjacent dots with vertical or horizontal lines to make a single loop. The numbers ...
7
votes
2answers
224 views

Puzzle of the day, Frame Sudoku

The rules are the same as the classic Sudoku, but the numbers outside the grid are the sum of the first three digits placed closest to that row or column
11
votes
1answer
297 views

Introducing: MIXXOX Grid Puzzle!

Rules of MIXXOX: Put either X or O in each empty cell. A border between two adjacent cells may have a mirror, denoted by a bold line. Some mirrors are already given. Note that the outer ...

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