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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9
votes
1answer
54 views

Didn't you ask me for a crossword?

An entry in Fortnightly Topic Challenge #forty-seven: "Wacky Sudokus" Here's that crossword you asked for... Sorry, what's that - you didn't ask me for a crossword?? TASK: Solve the puzzle ...
9
votes
1answer
70 views

Skyscrapers in Sudoku!!! - SS#10

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the tenth puzzle in this series! For more information about the series, see the first ...
21
votes
1answer
1k views

A Puzzling Sudoku (Warning: Hot!)

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" A Sudoku with an oddly familiar shape. Here's a Penpa Link. Rules: Normal Sudoku rules apply (Special) Thermometers: The ...
8
votes
1answer
256 views

A 7x7 Suguru - SS#9

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the ninth puzzle in this series! For more information about the series, see the first ...
10
votes
1answer
337 views

Nurikabe: The Super-Kabe Attacks!

This puzzle is another Nurikabe, but with a new twist for me: it's a gigantic Super-Kabe! It's also, in my opinion, quite tricky and has some interesting deductions. I hope you enjoy! Rules of a ...
23
votes
1answer
1k views

The Blank Sudoku

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" (h/t to Beastly Gerbil, whose 1,2,3... Trinary!!! puzzle provided inspiration for this puzzle) This puzzle is a normal Sudoku, ...
10
votes
1answer
429 views

A Difficult Wacky Sudoku - SS#8

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the eighth puzzle in this series! For more information about the series, see the first ...
11
votes
1answer
208 views

A Scrumptious Sudoku Sandwich - SS#7

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the seventh puzzle in this series! For more information about the series, see the first ...
10
votes
1answer
242 views

Sudoku… with 10 digits? SS#6

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the sixth puzzle in this series! For more information about the series, see the first ...
7
votes
2answers
632 views

Are there any games like 0hh1 but with bigger grids?

I am loving 0hh1 but I got bored by the largest grid 12x12. Are there similar games but with much larger grids?
15
votes
1answer
209 views

Compoundoku wants REALLY BIG and WACKY!

This is an entry for Fortnightly Topic Challenge #47: Wacky Sudokus. Rules of Compoundoku: Solve both left and right Sudokus. In addition, the board below them is the Compound Board of both Sudokus. ...
10
votes
1answer
294 views

Nurikabe: The Twisty Corridors

This puzzle is a Nurikabe. It is a little tougher than my previous one, which was designed for newer solvers, and it has a particularly squiggly solution that I found pleasing enough to post - hence ...
7
votes
1answer
120 views

A Mosaic Sudoku - SS#5

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the fifth puzzle in this series! For more information about the series, see the first ...
15
votes
1answer
880 views

Stop BorgBot before it's too late!

There was a deafening metallic thunk as the rogue AI locked the door of the PuzzlingCorp server room, trapping the engineers inside. A countdown appeared on the computer screen... and began counting ...
3
votes
1answer
87 views

Sudoku + Nurikabe = Sudokabe

The following Sudoku has a nice little twist: after solving, use the numbers in the green squares as a basis for a Nurikabe puzzle. You can create a new grid for the Nurikabe (a 9x9 grid with the ...
13
votes
1answer
183 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 ...
11
votes
1answer
162 views

Greener Grasses: Nusi's Birthday

Here is another Greener Grasses puzzle. Also, happy happy birthday to my fellow Indonesian puzzler, Nusi! I'm sorry that I realize the puzzle was broken in the last-minute checking so a single letter ...
7
votes
1answer
121 views

Shattered Webs - SS#3

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the third puzzle in this series! For more information about the series, see the first ...
10
votes
2answers
346 views

1, 2, 3… Trinary!!! (SS#2)

An entry in Fortnightly Topic Challenge #47: "Wacky Sudokus" Other puzzles in this series Welcome to the second puzzle in this suduko series! For more information about the series, see the ...
16
votes
0answers
183 views

Stupendous Sponge

General Notes This puzzle takes the form a 9×9×9 level-one Menger sponge whose surface is divided into 648 1×1 cells. The aim is to draw a single non-crossing loop along its surface by connecting the ...
13
votes
1answer
476 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 ...
2
votes
1answer
396 views

My sister has gone Puzzled again

I once got a letter from my younger sister. It reads :- Hello brother, How are you? I am fine. I have seen you have given me a lot of gifts, thank you for that. Here's a present from my side. Since I ...
20
votes
1answer
529 views

2021 Unpainted Masyu

Paint some white circles to black such that the Masyu will be uniquely solvable and: Exactly 2 of 11 white circles on the left forming '2' should be painted black. Exactly 0 of 12 white circles on ...
-8
votes
1answer
126 views

Shikakui Hebi: Similarities

Introduction puzzle: here So, my first Shikakui Hebi puzzle didn't go well, so I'm trying again! Only this time, no more arrows. Instead, it's now a nonogram-like! This is a Shikakui Hebi puzzle. ...
8
votes
1answer
145 views

Sashi Park: an introduction

This is a Sashigane-Statue Park hybrid. The rules might look complicated, but they're just the two rulesets smushed together. Familiarity with both genres will help. Rules Statue Park (adapted from ...
9
votes
1answer
145 views

Tetrikabe: Parallelogram

Rules: (Nurikabe section shamelessly stolen from an earlier puzzle by @jafe) Numbered cells are unshaded. Unshaded cells are divided into regions, all of which contain exactly one number. The number ...
13
votes
1answer
233 views

Nurikabe: A Gentle Walk in the Hall of Giants

This puzzle is a Nurikabe that is designed to be a gentle introduction to the genre, with a learning curve of progressively harder deductions. It is encouraged for first-time solvers and those who ...
-1
votes
1answer
178 views

Shikakui Hebi: Introduction

Shikakui Hebi is a new grid deduction puzzle I invented. It translates from Japanese which means "Square Snake". It quite sounds like Slitherlink, but trust me, it isn't. Rules of Shikakui ...
-3
votes
2answers
195 views

Kyudoku :- Merry Christmas?

Previous Puzzle:- Kyudoku :- Introduction There will be numbers in a grid. You just have to circle nine unique numbers (1 to 9) such that each row and column has sum of 9 or less. In some puzzles, one ...
11
votes
2answers
604 views

Kyudoku :- Introduction

This is a Kyudoku Puzzle. I have made the rules myself. There will be numbers in a grid. You just have to circle nine unique numbers (1 to 9) such that each row and column has sum of 9 or less. In ...
9
votes
1answer
208 views

Embassy Park - A Grid Deduction Puzzle

An entry in Fortnightly Topic Challenge #45: Flags This grid deduction puzzle is a variation on the OP's previous Office Park puzzle. You are given a set of seven buildings, which are tetracubes, 3-...
10
votes
1answer
183 views

Easy As LITS: Lots of “S”s

This is an Easy as LITS puzzle (LITS variation), where you shade cells to form tetrominoes Rules taken from Grandmaster Puzzles: Shade exactly four connected cells in each outlined region, to form an ...
12
votes
1answer
733 views

If 2020 Were A Sudoku

A bit of light relief to round out the year. No special genius required :-)
12
votes
2answers
289 views

A sudoku that's already filled in for you

The usual rules of sudoku apply: each row and column must have one of each digit; plus, if you divide the whole nine-by-nine grid into nine three-by-three subgrids, then each subgrid has one of each ...
10
votes
1answer
205 views

Hokuro Puzzle 10x10

After introducing this new puzzle type, here is a slightly more challenging Hokuro puzzle. Hokuro is a grid deduction puzzle inspired by Kakuro with the following rules: Each cell contains one of the ...
29
votes
1answer
809 views

A flag-packing problem

An entry in Fortnightly Topic Challenge #45: Flags You are provided with a 9x9 grid of squares and 21 minimalistic flags (pictured below, all shown to scale). TASK: Assign a colour (Black, Blue, ...
10
votes
1answer
202 views

Sashigane: 5 arrows + 1 six

This is a Sashigane puzzle, where you divide the grid into L shapes. Rules taken from Nikoli: Divide the grid into L shaped blocks - one block wide. All blocks must be L shaped. Cells with open ...
14
votes
1answer
358 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 ...
3
votes
1answer
111 views

Nurikolor (Level 9)

Previous Level: Nurikolor (Level 8) It's been almost two months since I've last done this. Don't worry, I'm not dead, I was just working on this. RULES: There are colored numbers on the grid, which ...
15
votes
1answer
400 views

Cross-Pollination

This puzzle is a hybrid of three different puzzles: Cross the Streams (h/t to athin for recalling this excellent puzzle type), Nurikabe, and Tapa. In this puzzle, as with all three of its progenitors, ...
7
votes
1answer
180 views

The First No L Sudoku

Normal Sudoku rules apply. In addition no L-shaped tetromino can contain four consecutive digits (for instance you can't have r2c9=5,r4c9=8). The little killer clue indicates cells on the indicated ...
15
votes
1answer
416 views

Neighbors Grid Puzzle: A Puzzling SE

This is an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the community. Here is a standard Neighbors puzzle. Rules of Neighbors: Place one of the digits 1, 2, or ...
6
votes
2answers
266 views

Holiday Madness: Draw a line through all the gifts

Can you collect all the gifts? The rules: Start from the star At each intersection are arrows. You can only move through the intersection in accordance with the direction of the arrow. (e.g If you ...
12
votes
1answer
245 views

Light and Shadow: Equal and Antisymmetric

This is an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the community Light and Shadow is a puzzle where you divide the grid into regions painted either white or ...
11
votes
1answer
308 views

Cross the Streams: Three?

This is an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the community. Here is a standard Cross the Streams puzzle. The genre is invented by Grant Fikes which ...
11
votes
1answer
267 views

Less than 6 Sudoku

In the following sudoku the numbers on the borders indicate the first number less than 6 seen in that row/column. So for example, the 4 at the bottom means that the first number less than 6 seen from ...
13
votes
1answer
269 views

Fighting Fish: An Aquarium-Star Battle Hybrid

This is an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the community. UPDATE NOTE: The original image had the upper right indicator that there are two fish per ...
13
votes
1answer
337 views

Greener Grasses: Around the Trees

This is an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the community. Greener Grasses is apparently a new genre of grid puzzle. Pitched by Joseph Howard and ...
17
votes
1answer
296 views

Sashigane: The Fives Have It

This is an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the community This is a Sashigane puzzle, where you divide the grid into L shapes. Rules taken from ...
2
votes
1answer
119 views

Stuck on a minesweeper supposedly solvable through pure deduction

I'm playing minesweeper on a website that says you can win using pure deduction without guessing, and I am currently stuck in the top left corner of the map. It's a 30x16 grid with 170 mines and the ...

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