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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14
votes
1answer
636 views

(Re-)Introducing KPK Puzzle!

Rules of KPK: Put the letter K or P on every empty cell. Clues outside the grid on the first row/column show how many letters ordered as "KPK" can be seen on the corresponding row or column....
14
votes
2answers
630 views

Now you're Packing with Portals #2: Hashtag

Place the colored shapes into the white area, without rotations or reflections, so that they fill it perfectly. The gray walls don't just block shapes, though - they act as portals! When you place a ...
14
votes
2answers
696 views

A Trip to Ripple Islands

All aboard! All aboard! You have won an ALL-EXPENSES PAID TRIP to the magnificent Ripple Islands! Now, the only price of admission is to solve this little puzzle. It is a Ripple Effect puzzle based ...
14
votes
1answer
723 views

Up like a rocket ship

This is a Palisade (or 6 Cells) puzzle. The rules are: Thicken some of the pentagons' sides so the thick borders outline regions of six pentagons apiece. Any pentagon with a number in it indicates ...
14
votes
1answer
447 views

Double Chocolate: Happy Valentine's Day!

Hikouki (@flight_float) over on Twitter issued a challenge to make a Double Chocolate logic puzzle with a fixed grid pattern, and lots of logic puzzle makers responded to that challenge! Here's my ...
14
votes
2answers
669 views

Distance Puzzle

The rules are: 1. Draw two circles (O) in the empty cells in every row and column. 2. The numbers in the black cells indicate the space between the 2 circles in the black cells' row or column, in ...
14
votes
1answer
674 views

Ripple Effect ... with Inequality Sign

I was making ripple effect but failed on uniqueness. That leads me to think of using inequality signs to fix the puzzle. Then, I'm wondering, what if, I make a new one with intentional inequality ...
14
votes
3answers
368 views

Cross ALL the Streams

This grid deduction puzzle is a hybrid of three puzzle types: Cross the Streams, Tapa and Star Battle; rules for each are summarized below. In this grid, every cell is to be shaded either red, blue, ...
14
votes
1answer
642 views

Bobblie Statue Park

This is a Statue Park puzzle. Rules of Statue Park: (shamelessly stolen from an earlier puzzle by @Deusovi) Shade some cells of the grid to form the given set of pieces. Pieces may be rotated or ...
14
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2answers
1k views

Wait, so how many mines are there? A tetromino minesweeper

Here's another tetromino minesweeper. I have bolded where the rules differ between this one and my first tetromino minesweeper Rules: A number indicates how many adjacent (including diagonally ...
14
votes
1answer
373 views

Statue View: Raindrops

This is a Statue View puzzle, an original invention combining two logic puzzle genres: Statue Park and Canal View. It is harder than my previous Statue View, so you may want to start there. Rules of ...
14
votes
2answers
617 views

The Terrible Twos of Slitherlink

This question is aimed at people who have a really good grasp of standard Slitherlink puzzles. This is a standard, square cell, 10x10 Slitherlink puzzle I designed. It isn't what I would call a "...
14
votes
1answer
586 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 ...
14
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2answers
1k views

A Shingoki Puzzle

This is a Shingoki puzzle. Rules of Shingoki: Draw lines between the dots to form a single loop without crossings or branches. The loop should pass through every circled number in the grid. For ...
14
votes
1answer
899 views

Heyacrazy: Crosses

This is a Heyacrazy puzzle. Heyacrazy is an original genre, inspired by the "two border" rule of Heyawake and Heyawacky. Rules of Heyacrazy: Shade some cells of the grid. Shaded cells ...
14
votes
1answer
347 views

Broken Masyu: Quartered

Below is an 8x8 Masyu puzzle (rules can be found here), but the puzzle has been broken into four pieces! Can you put the pieces back together to make a proper Masyu puzzle with a unique solution? (The ...
14
votes
1answer
510 views

Trichain: A Bottle of Rum

This is a Trichain puzzle. The rules of Trichain are as follows: Numbers must be white, and match the size of their white islands. Each white island can only contain at most one number. Some white ...
14
votes
1answer
633 views

Pentominous - P is for…

This is a Pentominous puzzle. Rules of Pentominous: Dissect the grid into regions of 5 cells each. No two regions of the same shape can be adjacent (but they may touch at a corner). Rotations and ...
14
votes
1answer
655 views

The Blind Killer - a new series! SS#1

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to a new sudoku series! This series will run for the duration of the current Fortnightly ...
14
votes
1answer
527 views

Pento-Doku: Pentominous + Sudoku

Intended for Fortnightly Topic Challenge #47: Wacky Sudokus, but I was too slow making it... not for lack of trying, I assure you This puzzle is both* a Pentominous and a Sudoku**. Rules Solve the ...
14
votes
2answers
590 views

Slitherlink with crossing allowed

In a Slitherlink puzzle, you need to construct a single closed loop connecting points of a grid such that each number clue counts the number of adjacent loop segments. Normally, a Slitherlink puzzle ...
14
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2answers
370 views

Sub Battle Sudoku

Please find below a variant Sudoku which incorporates elements of Star Battle. The Sudoku is a standard irregular Sudoku, and the clues outside the grid are sandwich clues: the sum of digits strictly ...
14
votes
1answer
373 views

Sum-until-1 Fillomino: Odds, Fibonacci, and Pi

Fillomino rules (taken from Nikoli): Fill in all empty cells with numbers under the following rules. Divide all of the board into blocks. Fill each block with the same number horizontally or ...
14
votes
1answer
252 views

This is an Odd Sudoku - SS#4

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the fourth puzzle in this series! For more information about the series, see the first ...
14
votes
1answer
476 views

Hey! Wake Up! Look At This Grid Puzzle!

The grid is divided into rooms, though some are wibbly-wobbly weird-shaped. Hey, aren't these normally supposed to be blocks? What should the title of this puzzle really be? ...
14
votes
1answer
659 views

Partiti : solve this new type of puzzle

These are puzzles similar to Kakuro, which is the creation of a friend of mine whom I met last year: Rules: Place one or more digits from 1 to 9 in arbitrary order in each empty cell, such that a ...
14
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2answers
671 views

Double n-queen puzzle, with sudoku rules

Put 9 blue queens and 9 pink queens, with rules : If the blue queens are removed, the pink queens do not attack each other. If the pink queens are removed, the blue queens do not attack each other. ...
14
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1answer
482 views

Sudoku - less than 6 and knight's move

In the following sudoku, the numbers on the outside indicate the first number less than 6 seen in that row/column. In addition, a number in the sudoku cannot be a knight's move from an identical ...
14
votes
1answer
337 views

Tapa on a Penrose Tiling

An entry in Fortnightly Topic Challenge #51: Non-rectangular grids. This is a standard Tapa puzzle, on a non-standard Tapa grid...the "grid" is a Penrose tiling! Since the grid is not ...
14
votes
1answer
205 views

Domatic lights - 4 colors

You must add red, green, blue and yellow light bulbs to the grid to satisfy these rules. Each white hex must contain either a red, green, blue or yellow light bulb. Light bulbs of the same color ...
13
votes
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
2answers
576 views

Jewel Cave - A Statue Park-Cave Hybrid

The goal of this puzzle, a hybrid of Statue Park and Cave, is to place the given shapes into the grid, subject to the following rules. As in both original puzzles, all unshaded squares must form a ...
13
votes
2answers
419 views

The entrapment of Beastly Gerbil

Part 1: The disappearance of Beastly Gerbil Part 3: The escape of Beastly Gerbil I've been trapped here for what feels like forever. This is all I've known. Darkness. The occasional flash of light, ...
13
votes
2answers
526 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 ...
13
votes
1answer
516 views

3D nonogram – What's in the box?

This is a three-dimensional nonogram. The first six squares depict the layers of a $6\times6\times6$ cube. The final square gives the enumerations for the Z-axis, top to bottom. Some rules: The grid ...
13
votes
1answer
1k views

Strategy for solving 0hh1 and Unruly?

Q42's game 0hh1 and Simon Tatham's game Unruly are two almost identical logical deduction games. In each one, we're given a square grid which is to be filled by tiles of two colours, and a certain ...
13
votes
1answer
407 views

Piece de Resistance - Jack in all Tags... But Master in All?

Jack in all Tags... But Master in All? This puzzle is part of the "Piece de Resistance" series. Go back to Part 1 (Ace) for the story.Ace Two Three Four Five Six Seven Eight Nine Ten Queen King... ...
13
votes
2answers
312 views

Let's Play Tetris!

Fill the whole grid with Tetrominos. Every cell must be part of exactly one Tetromino. Tetrominos can be rotated as necessary. The colored clue cells must be part of the indicated type of ...
13
votes
1answer
746 views

A bicolour masyu

This is a bicolour masyu puzzle. Instead of making one continuous loop, the goal is to make two separate loops, one blue and one red. The coloured circles must be used for the loop of the same colour, ...
13
votes
2answers
586 views

A spiral Ripple Effect puzzle

I'd say the rules to a ripple effect puzzle are best explained here. Anyways, I was making a bunch of Ripple Effects and decided to do a big one which didn't work out as I'd hoped, in that I needed ...
13
votes
1answer
463 views

Pipelink: A Cat for jkittykitkat

Rules of Pipelink: Draw a loop through the centers of all cells. Two perpendicular line segments may intersect (cross) each other, but not turn at their intersection or otherwise overlap. Clues show ...
13
votes
1answer
849 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 ...
13
votes
1answer
526 views

Heteromino: Introduction

Heteromino is an area-dividing puzzle with very simple rules. I encountered this puzzle type on puzz.link, and seeing there's none posted here, I decided to give it a try. Here is an example puzzle ...
13
votes
1answer
434 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 ...
13
votes
1answer
894 views

A walk after dark

This is a Palisade (or n-Cells) puzzle. The rules are: Thicken some of the squares' sides so the thick borders outline cells. One such cell comprises just one square; one cell comprises precisely two ...
13
votes
1answer
412 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:...
13
votes
1answer
278 views

Maserlink - A Masyu-Slitherlink Hybrid

Both Masyu and Slitherlink puzzles have as their target a single closed loop that does not touch or intersect itself. So it seems natural to create a hybrid that uses both Masyu and Slitherlink clues. ...
13
votes
2answers
669 views

Tetromino minesweeper: the Amphitheater

This is a minesweeper puzzle with a tetromino twist. The goal is to place mines in the grid, following a few constraints. Rules: A number indicates how many adjacent (including diagonally adjacent) ...
13
votes
1answer
474 views

Nurikabe: Hindsight in 2020

This is a Nurikabe puzzle. The goal is to shade some cells so that the resulting grid satisfies the following rules.1 Numbered cells are unshaded. Unshaded cells are divided into regions, all of ...
13
votes
1answer
399 views

Colombian Sudoku

Fill each empty cell of the board on the left with a digit between 1 and 6. Each column and row must contain all digits. The dots outside the board on the right indicate how many cells in the ...

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