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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4
votes
1answer
54 views

Filling numbers in a grid

Here's the problem and the diagram that goes with it Fill in each empty space of the grid in the image below with a number from 1 to 8 so that every row & column contains each of these digits only ...
10
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1answer
105 views

Statue Park: Spare Parts

I've been doing a bunch of shape-placing puzzles lately, and I found some spare parts leftover. I figured I'd make a Statue Park out of them! The grid: Solver Note I know there are a lot of squares ...
11
votes
1answer
192 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. ...
3
votes
2answers
222 views

Is this N=3 Star Battle unsolvable?

Recently I've been solving some puzzles known as Star Battle, but I've come across a puzzle that no matter how many times I restart, I always seem to arrive at a contradiction. Star Battle is played ...
18
votes
3answers
1k views

Statue Park: Self-portrait!

This is a Statue Park puzzle. Rules of Statue Park: (adapted from an earlier puzzle by @Deusovi) Shade some cells of the grid to form the given set of pieces. Pieces may be rotated or reflected. ...
7
votes
1answer
130 views

Nonorasu - A Nonogram-Kakurasu Hybrid

Both Kakurasu (or see this puzzle for a description) and Nonogram puzzles require the solver to shade certain cells in a square grid by providing clues to the shading pattern of individual rows and ...
7
votes
0answers
128 views

How to prevent overcluing in a Statue Park?

I'm interested in making some Statue Park puzzles. This genre seems easy to accidentally overclue. I have read Deusovi's grid-deduction creation guide, but all it had to say was this: When placing ...
-2
votes
1answer
195 views

Nurikolor (Level 7)

Previous Level: Tapa-Nurikolor (Level 6) I saw that the last $2$ levels had a lot of flaws and were not unique. Hence this time I am giving an easy puzzle with uniqueness , with an 8x8 grid and 6 ...
-2
votes
1answer
177 views

Tapa-Nurikolor (Level 6)

Previous level: Massive NuriKolor (Level 5) (Red-Fury) Next level: Nurikolor (Level 7) We now have Tapa involved in the Nurikolor puzzle, and this is the 6th one (if you include a spinoff.) There ...
10
votes
1answer
289 views

Trichain: The Capital “A”

Previous: Trichain: Going Higher Trichain is a puzzle type I invented. It is somewhat similar to Nurikabe, but it uses a chain of L-trominoes instead of a continuous wall. Example puzzle with ...
12
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2answers
990 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 ...
4
votes
1answer
124 views

Another Nutakapa

This puzzle is another Nurikabe-Tapa hybrid puzzle, similar to one of the poster's previous puzzles. In this grid, your task is to create a single fully-connected shaded path with no 2-by-2 blocks ...
-6
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1answer
205 views

Massive NuriKolor (Level 5) (Red-Fury)

Previous Level: Nurikolor (Level 4) Next Level: Tapa-Nurikolor (Level 6) Level 5 introduces a 11x12 grid, and this time we have 9 colors. (Colours used here are Red, Blue, Green, Ivory, Brown, Orange,...
2
votes
3answers
226 views

Nurikolor (Level 4)

Previous Level: Nurikolor (Level 3) Next Level: Massive NuriKolor (Level 5) (Red-Fury) Level 4 introduces a 9x9 grid, but we still have 8 colors to work with. There are colored numbers on the grid, ...
6
votes
1answer
299 views

Nurikolor (Level 3)

Previous Level: Nurikolor (Level 2) Next Level: Nurikolor (Level 4) Level 3 has arrived, and the grid gets larger, now being an 8x8. The rules still apply. There are colored numbers on the grid, ...
5
votes
1answer
190 views

Nurikolor (Level 2)

Previous level: Nurikolor (Level 1) Next level: Nurikolor (Level 3) Level 2 of Nurikolor is now here. As a recap, here are the rules, but changed "X" to colors. There are colored numbers on ...
11
votes
2answers
440 views

Slitherlink (Sheep & Wolves)

Apply Slitherlink rules. In addition, all sheep must be inside the loop and all wolves must be outside the loop.
6
votes
1answer
210 views

Nurikolor (Level 1)

Next level: Nurikolor (Level 2) Welcome to my new puzzle: the NURIKOLOR, which is essentially the colored version of Nurikabe, but not exactly, with a few twists. The rules are simple: There are ...
2
votes
0answers
271 views

Not a sudoku, but still fun?

Context: I was trying to solve some of the puzzles on this site, when it occurred to me to make a puzzle variant myself. I immediately could construct one with my additional rule. Making an ...
7
votes
1answer
400 views

A sudoku with only four given digits and some more rules

Ok so this is one of the hardest sudokus (and one of the best sudoku) I have ever seen, with only $4$ given digits. There are some more rules too :- $(i)$ First, normal sudoku rules apply here. $(ii)$ ...
13
votes
1answer
457 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 ...
16
votes
1answer
394 views

Ingrid Deduction pops by with a puzzle

The other night I was sat at home in Providence when the doorbell rang. To my surprise, my very good friend Ingrid Deduction stood on the step, a huge grin on her face and a piece of paper held out ...
10
votes
2answers
323 views

Nutakapa: A Nurikabe-Tapa Hybrid

Nurikabe and Tapa puzzles have the interesting property that the target shading is identical for both: a fully-connected shaded region with no 2-by-2 blocks. The difference is the cluing, so there ...
6
votes
1answer
267 views

Trichain: Three Times Ten

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
373 views

Trichain: Going Higher

Previous: Trichain: Introduction | Next: Trichain: The Capital "A" Trichain is a new puzzle type I invented. It is somewhat similar to Nurikabe, but it uses a chain of L-trominoes instead ...
11
votes
2answers
610 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) ...
17
votes
1answer
445 views

Trichain: Introduction

Next: Trichain: Going Higher Trichain is a new puzzle type I invented. It is somewhat similar to Nurikabe, but it uses a chain of L-trominoes instead of a continuous wall. Example puzzle with ...
17
votes
1answer
898 views

Take a look at my aquarium

This is intended as a gentle introduction to one of my current favourite grid-deduction puzzle types: Aquarium. The puzzle is played on a rectangular grid divided into regions called "aquariums&...
7
votes
1answer
152 views

Raindrops revisited

I made a big mistake with my last post, and the puzzle I presented did not have a unique solution...many thanks to Deusovi for pointing it out, and many apologies to Deusovi and any others who spent ...
7
votes
2answers
497 views

Tribute to Eugene Varshavsky bwahhahahahahahahah

Each cell in the lower-right 9x9 grid must contain a positive integer or be left blank. Numbers on the outside of the grid indicate the sums of one or more adjacent digits in that row or column, in ...
36
votes
1answer
1k views

This new puzzle type needs a name {EXTREME EDITION}

A companion puzzle to the 'This new puzzle type needs a name' series, and inspired in part by @JeremyDover's answer to a recent question. Usually, puzzles in this series comprise a mash-up of two ...
2
votes
0answers
394 views

A robot moving on a grid. Part 2

This is an extension of the discussion A robot is placed on a grid point. At each move the robot must take three steps along the edge of the grid. After each step the robot must turn right. Lengths of ...
13
votes
1answer
551 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 ...
17
votes
1answer
309 views

Pentominous - Niftily

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 ...
12
votes
1answer
201 views

An invitation to tapas for you, plus one

Alas, this is not an invitation to a tasty meal for you and your sweetie, but rather an invitation for you to try out these two Tapa puzzles. And the plus one? That's how the puzzles are related: if a ...
14
votes
1answer
189 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 ...
5
votes
1answer
180 views

A Nurikabe-Kakurasu study

This puzzle is another study for a (hopefully) upcoming puzzle, which I think has an interesting solution path. This puzzle contains a Nurikabe and a Kakurasu (see a previous puzzle for details). The ...
12
votes
1answer
367 views

Domatic lights - with Xs

You must add red, green and blue light bulbs to the grid to satisfy these rules. Each white hex must contain either a red, green or blue light bulb, or an X. You can't add Xs yourself. Light bulbs of ...
10
votes
1answer
271 views

No Numbers Sudoku: The Ball of Queens

Those are all of the numbers you need. No, I did not forget any. Normal sudoku rules apply. All numbers, except for 1's and 9's, are queens with respect to themselves. E.g. 2's have the queen's ...
8
votes
1answer
273 views

Domatic lights puzzle - an introduction

Rules: Each white hex must contain either a red, green or blue light bulb. Light bulbs of the same color cannot be in neighboring hexes. Each white hex must be lit by all three colors of light (...
4
votes
1answer
180 views

Another logic study

I'm working on another idea for a combination logic puzzle, and as before I've been gearing up by creating some studies. This first one came out decently, I think, so I figured I'd share it. This ...
10
votes
1answer
304 views

Gokigen Naname - 1 and 2

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 in a circle ...
37
votes
2answers
2k views

Q: What kind of logic puzzle would you like? A: Yes

A recent post and Stiv's answer provided inspiration for a new puzzle. I posted a study for this puzzle earlier; this is the bigger effort envisioned. I hope you enjoy! This puzzle consists of four ...
12
votes
1answer
523 views

Nurikabe-Slitherlink

Yesterday's post and Stiv's answer provided inspiration for a new puzzle. What I envision will be a big effort, so I spent part of yesterday creating a study, a sample part of the bigger puzzle to get ...
17
votes
2answers
976 views

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 ...
15
votes
1answer
292 views

Letter Scrabble - Indonesia's Independence Day Special

August 17 is Indonesia's Independence Day! On this special occasion, I'm constructing a puzzle to honor all 7 Indonesian presidents. :) The rules of Letter Scrabble: Place each of the given words ...
4
votes
1answer
190 views

Fill in the letter cycles

ITM . NDR . EAU . ULT . TEN . TDP . YMH . RYI . SHM . PED . ODP . HIT . AKL . NPT . UKT . UTS . ESA . PRT . DOR . YMT Fill each of the empty circles above with a unique letter. Each of the three ...
5
votes
3answers
802 views

Will you be the first to get free?

It is your first day in prison and you are approached by a guard having a hunch for puzzles. He tells you that he gives every new prisoner the chance to be freed if they can present him with a version ...
12
votes
1answer
621 views

Linesweeper (Knight)

Draw a single loop which does not intersect itself by connecting pairs of cells which share an edge. The loop may not pass through any clue cells. Numbers indicate how many of the cells which the clue ...
15
votes
1answer
245 views

Compoundoku wants REALLY BIG!

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) the number ...

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