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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11
votes
2answers
448 views

Compoundoku wants 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) ...
23
votes
2answers
1k views

Introducing: Compoundoku!

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) ...
1
vote
1answer
167 views

What is the smallest number of lies needed to solve a Dragon Joust puzzle?

I recently watched this video which presents a deduction "riddle" about dragon jousting. The rules for the puzzle (from the video) are as follows: After centuries of war, the world’s kingdoms have ...
11
votes
1answer
392 views

Latin-Square Adjacent Puzzles

Here are two $5 \times 5$ Latin-Square Adjacent puzzles. For each cell, put a digit between $1$ and $5$ such that: Each row and column contains one occurrence of each digit $1$ to $5$. If two cells ...
18
votes
4answers
825 views

Another new puzzle type needs a name

For an example of how this type of puzzle works, see here... I believe I have invented another new type of puzzle... What is its name? Colour-blind-friendly version available here. Begin by ...
3
votes
4answers
378 views

Help with a sudoku puzzle

I would really appreciate some help because I spent more than hours finding another number. It is supposed to be a very hard one but I started well and according to the key, my numbers are correct. Do ...
7
votes
1answer
184 views

Captain Pun's favourite animals

My good friend Captain Pun's party was a truly excellent event. His new boat - the venue - was a beautiful thing to behold, decorated throughout with nonograms in frames (as anybody who knows him ...
5
votes
1answer
137 views

All That Remains Sudoku

. 2 . | . 7 . | . . 9 . 9 8 | . . . | . . . 3 . . | 9 . . | . . . ---------+---------+-------- 2 . 7 | . . . | . . . . 1 5 | 7 . . | . . . . . . | 1 5 8 | . ...
8
votes
1answer
231 views

Whirlwind of the Square Sudoku Table

. . . | . . . | . . . 6 . . | . . 1 | . 2 . . . . | . . . | . . . ---------+---------+-------- . . 7 | . . . | . . . . . . | . . . | . . . . . . | . . . | . ...
60
votes
1answer
4k views

This new puzzle type needs a name

I believe I have invented a new type of puzzle... What is its name? Colour-blind-friendly version available here. Begin by solving the 16x16 sudoku; each of the digits 1-16 must appear exactly ...
13
votes
1answer
186 views

Queens of the Square Sudoku Table

. 6 . | 8 . 3 | . 7 . . . 1 | . . . | . 6 9 7 . . | . . . | . . 5 ---------+---------+-------- . . . | 9 . . | . 1 . . . . | . . . | . . 4 . . 5 | . 1 . | . ...
7
votes
3answers
344 views

Organically Overhauling my Occupation

After secretly assassinating a wealthy doctor in the countryside, I found myself with surplus funds. Naturally, the best possible investment is investing in oneself, so I boarded a plane and went out ...
15
votes
2answers
2k views

An Ailing Assassin

Since moving to the countryside, I've taken up a side job as an assassin. While camping out with a doctor, they told me that I had contracted an illness. However, since I didn't take any money with me,...
8
votes
1answer
319 views

Party Time with Captain Pun

The other day my good friend Captain Pun invited me to a party on board his new boat. "What will the dress code be?" I asked. Captain Pun said he'd email me the details. Later that day I received ...
6
votes
1answer
258 views

Knights of the Square Sudoku Table

8 . . | . . . | . . 6 . . 4 | . . . | . . . . . . | . . . | 9 1 . ---------+---------+-------- . . . | . 2 . | . . . . . 9 | 3 . . | . . . . . . | . . . | . ...
13
votes
1answer
232 views

Unpainted Masyu

Exactly 3 of 7 circles here should be painted black to make the Masyu uniquely solved. Find them!
21
votes
1answer
1k views

Captain Pun's new boat

My good friend Captain Pun has bought a new boat. "And this is a picture of its sail!" he said, showing me this: "Solve the nonogram and you'll soon know what type of boat it is!" Can you solve ...
8
votes
1answer
131 views

Say “Herru” to Spatial Golf

Have a try with this 3D Herugolf puzzle! Rules of Herugolf: (Adapted from @Stiv's adaption of Nikoli) Move (hit) all circles (balls) one or more times, and bring them to a cell with a red ...
11
votes
1answer
417 views

Twelve Labours - #07 Cleats 'N' Balls

This puzzle is part of the ‘Twelve Labours’ series, but can be solved independently. Previous instalments can be found here: Prologue | 01 | 02 | 03 | 04 | 05 | 06 Emerging from the barbers with a ...
2
votes
4answers
619 views

Grid Puzzle - Paint

A student was found making Graffiti in the teacher's office. He was punished and was asked to repaint the wall of the room. The teacher gave him a grid to show which part of the wall should be painted ...
10
votes
2answers
577 views

Another Colombian Sudoku

Solve the Sudoku on the left, where the usual rules apply. The dots outside the board on the right indicate how many cells in the corresponding column or row of that board contain precisely the same ...
9
votes
2answers
342 views

Double feature: Bibliophile edition

This puzzle is part 12 of the Double feature series (first part here). The series will conclude in "Double features: The wrap-up". Rules of Tents and Trees1 Place a number of tents ...
9
votes
1answer
328 views

Grid Deduction Deduction: Cave or Tapa?

The following grids can be solved using either Cave or Tapa rules. First, determine what kind of puzzle each grid represents. (They can both be of the same kind, or there could be one of each kind.) ...
8
votes
1answer
418 views

Double feature: Computer problems

This puzzle is part 11 of the Double feature series (first part here). The series will continue in "Double feature: Bibliophile edition". Rules of Statue Park1 Insert eleven of the ...
6
votes
1answer
381 views

Double feature: Health shakes

This puzzle is part 10 of the Double feature series (first part here). The series will continue in "Double feature: Computer problems". Rules of Slitherlink1 Draw a single continuous ...
6
votes
1answer
173 views

More Crosses and Circles

Another case of circles and crosses. Place two crosses on two cells of each row and column of this 9×9 board, and circles elsewhere, so that the number on the right of each row indicates the number of ...
11
votes
1answer
399 views

Nurikabe: Roaring twenties

This is a Nurikabe puzzle. The goal is to paint some cells black so that the resulting grid satisfies the following rules.1 Numbered cells are white. White cells are divided into regions, ...
9
votes
1answer
449 views

Cryptic Battle: Welcome to PSE!

Inspired by jafe's Double feature series. The following is a hybrid Star Battle and diagramless cryptic crossword. Solve the clues and the grid, then place the clued words in the grid in a logical ...
13
votes
1answer
323 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 ...
11
votes
1answer
625 views

Double feature: Unpopular

This puzzle is part 9 of the Double feature series (first part here). The series will continue in "Double feature: Health shakes". Across 2. A victory is found in path leading to hardship (...
17
votes
1answer
519 views

Octagonal Kurotto

This is a Kurotto puzzle. Rules of Kurotto: Shade some cells to form connected groups of shaded cells. Circled cells are unshaded. If they have a number in them, that number tells you the sum ...
6
votes
1answer
237 views

Double feature: Going postal

This puzzle is part 8 of the Double feature series (first part here). The series will continue in "Double feature: Unpopular". Rules of Yajilin1 Shade some cells in the grid. The ...
9
votes
1answer
388 views

Double feature: Weightier

This puzzle is part 7 of the Double feature series (first part here). The series will continue in "Double feature: Going postal". Rules of Statue View1 Insert the four given pieces (<...
10
votes
1answer
391 views

Double feature: Legal trouble

This puzzle is part 6 of the Double feature series (first part here). The series will continue in "Double feature: Weightier". Rules of Hitori1 Shade some cells in the grid. No ...
9
votes
2answers
439 views

Double feature: In cold blood

This puzzle is part 5 of the Double feature series (first part here). The series will continue in "Double feature: Legal trouble". Rules of Nurikabe1 Shade some cells in the grid. ...
5
votes
1answer
257 views

Double feature: Hot stuff

This puzzle is part 4 of the Double feature series (first part here). The series will continue in "Double feature: In cold blood". Rules of Heyawake1 Shade some cells in the grid. ...
11
votes
2answers
919 views

Twelve Labours - #02 Lernaean Hydration

This puzzle is part of the ‘Twelve Labours’ series. Previous instalments can be found here: Prologue | 01 His first labour now complete, Hercules made his way up the street to the storage depot for ...
11
votes
1answer
270 views

Masyu keep making those 3D puzzles?

This is a three-dimensional Masyu puzzle. The five squares depict the layers of a $5\times5\times5$ cube. The goal is to make a single loop in 3D space which fulfills the following properties: ...
13
votes
1answer
312 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... ...
8
votes
2answers
343 views

Double feature: In concert

This puzzle is part 3 of the Double feature series (first part here). The series will continue in "Double feature: Hot stuff". Rules of Ripple Effect1 Fill the grid so that each cell ...
8
votes
1answer
278 views

Double feature: Russian desman

This puzzle is part 2 of the Double feature series (first part here). The series will continue in "Double feature: In concert". Rules of Masyu1 Make a single loop which goes through ...
12
votes
1answer
584 views

Double feature: Braaains

This puzzle is part 1 of the Double feature series. The series will continue in "Double feature: Russian desman". Rules of Akari (also known as Light Up)1 Insert light bulbs into any ...
8
votes
2answers
317 views

Spiral Stumper Series: Instructionless Puzzle

Spiral Stumper Series is a $5$-puzzles series taken from the Final Round of a local (national) contest, KPK, which has been ended recently and authored by me. The theme is spiral and each puzzle is ...
4
votes
1answer
155 views

Spiral Stumper Series: Ripple Effect

Spiral Stumper Series is a $5$-puzzles series taken from the Final Round of a local (national) contest, KPK, which has been ended recently and authored by me. The theme is spiral and each puzzle is ...
6
votes
1answer
100 views

A Curve of Pursuit Yajilin

Following on from my previous Yajilin, I wanted to make a harder one for your entertainment and amusement, and hopefully to keep @Deusovi occupied for more than 20 minutes. Rules (shamelessly ...
4
votes
1answer
177 views

Spiral Stumper Series: Fillomino

Spiral Stumper Series is a $5$-puzzles series taken from the Final Round of a local (national) contest, KPK, which has been ended recently and authored by me. The theme is spiral and each puzzle is ...
6
votes
1answer
358 views

A symmetrical Yajilin

Inspired by @Athin's efforts, I decided to try to come up with a Yajilin puzzle of my own for your entertainment and amusement. Rules (shamelessly stolen from @Athin's post) Draw a line to ...
4
votes
1answer
107 views

Spiral Stumper Series: Kurodoko

Spiral Stumper Series is a $5$-puzzles series taken from the Final Round of a local (national) contest, KPK, which has been ended recently and authored by me. The theme is spiral and each puzzle is ...
7
votes
1answer
211 views

Nurikabe: Sixes

This is a Nurikabe puzzle. The goal is to paint some cells black so that the resulting grid satisfies the rules1 of Nurikabe: Numbered cells are white. White cells are divided into regions, ...
4
votes
2answers
104 views

Spiral Stumper Series: Tilepaint

Spiral Stumper Series is a $5$-puzzles series taken from the Final Round of a local (national) contest, KPK, which has been ended recently and authored by me. The theme is spiral and each puzzle is ...