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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10
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1answer
107 views

Norinori: QR-Code-ish

This is an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the community. Here is a standard Norinori puzzle. Rules of Norinori: Shade exactly two cells in each ...
13
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1answer
247 views

Hexagonal Nurikabe

Nurikabe is a popular grid puzzle, usually played on a square grid. Here is my attempt to adapt it to a hexagonal grid. To solve it, you must shade cells in the grid such that these conditions are met:...
12
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1answer
319 views

Tatamibari: an introduction

This is an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the community This is a Tatamibari puzzle, where you divide the grid into rectangles and squares. Rules ...
12
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2answers
451 views

Nurimisaki Puzzle: Introduction

This is an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the community This is a Nurimisaki puzzle, an area-connection puzzle. Rules of Nurimisaki (taken from ...
7
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1answer
273 views

A Sneaky Yin-Yang Puzzle

Here is a standard Yin-Yang puzzle. Rules of Yin-Yang: Fill each empty cell with either a black circle or a white circle. All white circles should be orthogonally connected, so do all black circles. ...
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0answers
89 views

Social Distancing Colors - A New Type of Puzzle? [closed]

I think I just thought of a new type of puzzle: Social Distancing Colors. Each of the colors in the rainbow represents at least how much one has to distance by: Red is 6m, Orange is 5m, Yellow is 4m, ...
8
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0answers
165 views

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 ...
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0answers
157 views

A monster slitherlink!

Does anyone want to have a stab at this monster slitherlink? Source: https://mellowmelon.wordpress.com/2010/03/17/puzzle-217/
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1answer
128 views

Another Yin Yang puzzle! Part two

I am sure this puzzle has only one solution. Also the solver of this puzzle can put up a Yin Yang puzzle if they wish to start a series. Rules of Yin-Yang: Fill each empty cell with either a black ...
6
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1answer
140 views

Three-and-Two (Santoitchi variant): Confused Knights

Three-and-Two is a variant of Santoitchi, where the shaded cells ("monominoes") are replaced by shaded dominoes. Rules: Shade some cells. The shaded cells should form dominoes (contiguous ...
13
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2answers
461 views

Slitherlink - A0, B1, C2, D3

The standard Slitherlink rules apply. However, first replace $A_1$, $A_2$, $B_1$, $B_2$, $C_1$, $C_2$, $D_1$, and $D_2$; such that the Slitherlink is uniquely solvable. Moreover, these equations must ...
14
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2answers
1k views

A slitherlink with only 3's

As we know, 3's seems to be very rare in slitherlinks. This is the slitherlink with only 3's.
38
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3answers
2k views

Animal Cross(word)ing

An entry in Fortnightly Topic Challenge #43: Variety Crossword Grids Each of the 40 clues listed below (a mix of pop culture and science/nature) yields the name of an animal. Your task is to solve ...
2
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1answer
152 views

Lost in this Loopy puzzle

I got this Loopy (Cairo) puzzle, but got stuck here: I have no idea how to proceed without guessing with backtracking. Are there any local deductions possible here?
12
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1answer
272 views

A Cryptic Hourglass

An entry in Fortnightly Topic Challenge #43: Variety Crossword Grids The answers to ten cryptic clues need to be entered in the grid below. Words start in their numbered rectangles, and proceed down ...
1
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2answers
408 views

Another Yin-Yang puzzle

I saw someone post a ying-yang puzzle on here recently and I thought I might challenge people here with another one! Rules of Yin-Yang: Fill each empty cell with either a black circle or a white ...
32
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2answers
1k views

Self-contained math crossword with if-then-else clues

An entry in Fortnightly Topic Challenge #43: Variety Crossword Grids Since I'm not good with with words and crosswords, here is a math crosswords: to know all the operands for the calculations you ...
13
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2answers
1k views

Yin-Yang: All-White

Here is a standard Yin-Yang puzzle. Rules of Yin-Yang: Fill each empty cell with either a black circle or a white circle. All white circles should be orthogonally connected, so do all black circles. ...
13
votes
1answer
372 views

Hetero-F(our|ive)-Cells

This is a hybrid of Four Cells and Five Cells (uses pentominoes instead of tetrominoes), with a global no-repeated-piece rule. Rules: The grid is to be divided along the grid lines into areas ...
7
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2answers
492 views

An altered MineSweeper

I've been searching for an old project I did in college about a computer program to create and solve a special variation of the popular game MineSweeper where, instead of always one, you could have ...
8
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1answer
367 views

Four Cells: No Threes!

Four Cells is an area dividing puzzle. You may see an introduction to this puzzle here: Four Cells: An Introduction Rules of Four Cells: The grid is to be divided along the grid lines into areas ...
12
votes
1answer
597 views

A true no-no-gram

This is a nonogram with the usual rules. That is, you must fill white squares in with black so that the numbers at the head of each row or column indicate, in order, the respective lengths of ...
16
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1answer
401 views

Chain Puzzle: Tabletop Games #08 - Targui, or not Targui

This is the eighth Chain Puzzle in the Tabletop Games series, in which all puzzles are themed around board games, card games, tile games, and the like. The answer to this puzzle is a thematic word or ...
11
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1answer
289 views

Four Cells: An Introduction

This is a Four Cells puzzle, an area-dividing puzzle. Rules of Four Cells: The grid is to be divided along the grid lines into areas containing exactly four cells. A number in a cell indicates how ...
5
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1answer
93 views

Sjudoku II - A greater challenge in the world where 9 is 7

This is more difficult instance of a puzzle posted here. Rules similar to Sudoku applies: In each disk, the numbers 1,2,...7 should appear exactly once. No line may contain duplicate digits (note ...
20
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2answers
302 views

Tackling The Triptych

Normal Sudoku rules apply. Numbers on thermometers must increase, starting from the bulb end. Killer clues indicate the sum of three digits in a cage, which cannot include repeated digits. In columns ...
2
votes
2answers
107 views

Next step/strategies for an Area 51 (Slitherlink variant) puzzle

I've been doing quite a few Slitherlinks recently (and puzzles containing Slitherlink elements, such as Area 51). I'm familiar with all the patterns described in the Wiki article but I feel like there'...
13
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1answer
426 views

Shingoki: An Exploration of Unicode

An entry in Fortnightly Topic Challenge #42: Wordless Connecting Walls-- wait, what? This is a Shingoki puzzle. The rules (paraphrased from puzzle-shingoki.com) are as follows: The aim is to form a ...
7
votes
2answers
386 views

Santoitchi: Crowded?

Santoitchi is yet another genre involving trominoes. The name seems to mean Three-and-One in Japanese with a deliberate misspelling (イッチ instead of the usual イチ for "one"). Here is an ...
24
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9answers
3k views

Is there a puzzle that is only solvable by assuming there is a unique solution?

Is it possible to construct a puzzle that is: Solvable if you assume there is a single unique solution Not solvable if you do not make this assumption My intuition says that the answer is "No&...
9
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2answers
270 views

A 5-out-of-9 shading Nurikabe

Rules of Nurikabe: (copied from here) Numbered cells are unshaded. Unshaded cells are divided into regions, all of which contain exactly one number. The number indicates how many unshaded cells there ...
35
votes
4answers
2k views

Sjudoku - in a world where 9 is replaced by 7

Sjudoku (sju = seven in Swedish). Rules similar to Sudoku applies: In each disk, the numbers 1,2,...7 should appear exactly once. No line may contain duplicate digits (note that there are lines in 3 ...
7
votes
2answers
329 views

A half-shading Nurikabe

Rules of Nurikabe: (copied from here) Numbered cells are unshaded. Unshaded cells are divided into regions, all of which contain exactly one number. The number indicates how many unshaded cells there ...
12
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1answer
390 views

Tetrikabe: Socially Distanced Fours

Pentomino Nurikabe is still elusive, but here is another Tetromino Nurikabe! I'm not sure if the 4s are actually socially distanced enough. (The ones on the right and bottom are doing better than the ...
4
votes
1answer
127 views

5x5 suko puzzle

Okay, an easy one. From 1 to 25, without repetition, fill the numbers into the grids. Rules of Suko: The four cells around each boxed number should add up to that number Each set of colored cells ...
10
votes
1answer
407 views

A Chaotik-Evil Encrypted Doppelblock

This is a birthday gift for my friend: Ivan a.k.a. chaotic_iak! ^^ As noted, you may need this clue if you want to solve this logically (otherwise, challenge yourself like Ivan):
11
votes
2answers
539 views

An experimental sudoku

(Here is an experimental Sudoku created by me, however, the "box" constraint is not originally mine, but it'd be fun to try out this constraint.) Rules: Normal Sudoku rules apply. ...
7
votes
2answers
583 views

The physicist's puzzle

An unknown physic1st left behind this puzzle with his belongin9s and he can no longer Be found. Here is the puzzle he left with u5 before disappEaring. Can you figure who this mysterious physicist was ...
3
votes
1answer
195 views

Lasers: Cross through the bridges (Level 3)

Previous Level:- Lasers: The Reflection (Level 2) Rules : There will be lasers which are shaped like an arrow. The arrows pointing in the respective direction shows where the laser goes and the ...
6
votes
1answer
250 views

How to solve this Loopy puzzle efficiently with little backtracking?

I would like to solve this Loopy (Cairo) puzzle: But I would like to do so with as little backtracking as possible. By this I mean that I want to have at most one pending guess at a time; I do not ...
3
votes
1answer
219 views

Lasers: The Reflection (Level 2)

Previous Level:- Lasers : Introduction (Level $1$) So here is my lasers level 2 continued, and I have something new, mirrors! Rules: There will be lasers which are shaped like an arrow. The arrows ...
11
votes
1answer
301 views

Tetromino Nurikabe: Five Fours

I enjoy combining polyominos with grid-deductions. My current plan is to create a Pentomino Nurikabe. But that sounds hard, so I made this Tetromino Nurikabe as practice first. I think it came out ...
12
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1answer
560 views

Solve this algebraic equation

Wait what? Is there any equation?
17
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1answer
390 views

Connect Wall - Grid Puzzles Edition!

This is an entry for Fortnightly Topic Challenge #42: Wordless Connecting Walls. Huge thanks to bobble and Deusovi for playtesting! >< And hey, this one may also mark my 100-day puzzle here in ...
8
votes
2answers
168 views

Bridges of Carcass County

This is a Carcass Walking puzzle. The objective is to place the given cities into the grid, connect them with roads, draw one river across the grid, and find places for the given number of cloisters. ...
21
votes
1answer
961 views

What's going on with this puzzle?

What is going on with this slitherlink puzzle with clues $2^3$?
10
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2answers
780 views

Slitherlink with so many 2's

Normal slitherlink rules apply.
15
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2answers
589 views

Chain Puzzle: Tabletop Games #06 - So Sorry

This is the sixth Chain Puzzle in the Tabletop Games series, in which all puzzles are themed around board games, card games, tile games, and the like. The answer to this puzzle is a thematic word or ...
17
votes
1answer
571 views

Chain Puzzle: Tabletop Games #05 - It's Yahtzee, Jim, but not as we know it

This is the fifth Chain Puzzle in the Tabletop Games series, in which all puzzles are themed around board games, card games, tile games, and the like. The answer to this puzzle is a thematic word or ...
11
votes
1answer
443 views

Santoitchi: Introduction

Santoitchi is yet another genre involving trominoes. It appears to be invented by Inaba Naoki, and then picked up by Bram de Laat, who uses the name Sandwich (blame Google Translate for the possible ...

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