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.
332
questions
21
votes
1answer
988 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
112 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
366 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
605 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 ...
9
votes
2answers
557 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
330 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
312 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
406 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
370 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
169 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
393 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
435 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
310 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
593 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
497 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
232 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
383 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
384 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
431 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
250 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
853 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
259 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
299 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
336 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
264 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
573 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
310 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
151 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
97 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
173 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
352 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
102 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
210 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
100 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 ...
29
votes
2answers
758 views
Magic Maze Puzzle
Inspired by the board game, Magic Maze
Set-up:
Cut out each 4x4 tile, and the four small tokens (orange, yellow, green and purple), from the provided image below. Place tile 1 on a flat surface with ...
7
votes
2answers
319 views
Quick Yajilin Puzzles: Scatter and Gather
Yajilin (adapted from Nikoli)
Draw a line to make a single loop.
Lines pass through the centers of cells, horizontally, vertically, or turning. The loop never crosses itself, branches off, ...
6
votes
1answer
162 views
What's the next step in this Unequal (Futoshiki) puzzle?
I'm currently stuck on this puzzle from Simon Tatham's website (he calls it "Unequal", although the standard name according to Wikipedia is Futoshiki). My progress so far is:
I've even tried a few "...
12
votes
3answers
519 views
Quick Kurodoko Puzzle: Threes and Triples
Kurodoko (taken from Nikoli)
Colour cells black according to the following rules.
The numbers on the board show the number of white cells from the number to the nearest black cell or to the ...
8
votes
1answer
164 views
Nurikabe minicubes: the Headache, the Panache, the Apache
These are three-dimensional Nurikabe puzzles. In each case, the four squares represent the layers of a $4\times4\times4$ cube. The goal is to shade some cells in each layer so that the resulting space ...
5
votes
1answer
183 views
Piece de Resistance - Eight Doubled Tetrominoes Make a Tetronogram
Eight Doubled Tetrominoes Make a Tetronogram
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 ...
Time for ...
11
votes
1answer
140 views
Geisterbahn 2.0
This puzzle was inspired by the ruleset of Round 3 of the German Logic Masters 2019: Geisterbahn 2.0
Place the numbers 2 or 3 in some cells such that all the numbers are connected orthogonally, no ...
7
votes
2answers
202 views
Quick Shikaku Puzzle: Stars and Stripes
Shikaku (taken from Nikoli)
Divide the grid into rectangles with the numbers in the cells.
Each rectangle is to contain exactly one number and it's showing the number of cells in the ...
7
votes
1answer
144 views
Quick Nurikabe Puzzle: $4$s
Nurikabe (taken from Nikoli)
Fill in the cells with black under the following rules.
You cannot fill in cells containing numbers.
A number tells the number of continuous (adjacently) white ...
7
votes
3answers
245 views
Quick Ripple Effect Puzzle: $70$ Empty Cells
Ripple Effect (taken from Nikoli)
The areas divided by bold lines are called "rooms". Fill in all empty cells with numbers under the following rules.
Each room contains consecutive numbers ...
5
votes
1answer
473 views
Heyawake - why is this wrong solution
Dear people,
Why does this particular android game not accept the solution on the right side?
Rules in the app:
5
votes
1answer
150 views
Quick Moon-or-Sun Puzzles: 2x1-Dominoes and 1x1-Checkerboards
Moon-or-Sun (adapted from Nikoli)
Draw a line to make a single loop.
Lines pass through the centers of cells, horizontally, vertically, or turning. The loop never crosses itself, branches ...
14
votes
3answers
384 views
Instructionless: Sieve of Eratosthenes
This is an instructionless puzzle: work out the rules and then solve the main puzzle. An example and its unique solution have been given to you, as well as two failed solutions with errors marked.
...
7
votes
2answers
294 views
Quick Slitherlink Puzzles: KPK and 123
Slitherlink (taken from Nikoli)
Connect adjacent dots with vertical or horizontal lines to make a single loop.
The numbers indicate how many lines surround it, while empty cells may be ...
9
votes
2answers
318 views
Quick Tilepaint Puzzles: Corridors and Corners
Tilepaint (adapted from Nikoli)
The areas enclosed by bold lines are called "Tiles" and color the tiles with the following rules.
The cells of a tile must all be colored with black or left ...
13
votes
1answer
356 views
Sandwich Sudoku: First 12 digits of pi
Sandwich Sudoku, or "Between 1 and 9 Sudoku", is a variant of Sudoku. A YouTube channel introduced this variation.
Rules:
Standard Sudoku rules. Place numbers from 1 to 9 in every row, column, ...
