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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15
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2answers
705 views

3D Masyu - A Die

Fold this net into a cube and solve this 3D Masyu. The original Masyu rules apply. In addition, question mark '?' should be replaced by either a black or white circle. Side note: Yeah, it's almost ...
15
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5answers
1k views

A problem about Yin-Yang puzzles

In a Yin-Yang puzzle, one must fill every cell with either a black circle or a white circle according to the following rules: All cells with black circles form an edge-connected region. All cells ...
15
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3answers
314 views

Curve Data: A-hint for A-thin

I just recently know about Curve Data puzzles from Logic Masters India. Here I tried to write two simple puzzles to introduce them to you. They should be easy though as I still can't write a harder ...
15
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2answers
1k views

3D nonogram – Name the object

This is a 3D nonogram. The first five boxes represent the five layers of a $5\times5\times5$ cube, and the last box shows the enumerations for the Z-axis. (Note that 11 means two stretches of length ...
15
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1answer
418 views

Oriental HAISU - An unoriginal grid-deduction challenge

TheGreatEscaper comes up with several inventive (and original) grid-deduction genres, so I thought I'd try my hand at combining two of them. HAISU The rules are simple - draw a path from the O to ...
15
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2answers
986 views

25x25 slitherlink puzzle

Basic rules Form a loop using the dots (so, by joining orthogonally adjacent dots) such that a number N is surrounded by exactly N segments of the loop. Here's a tutorial puzzle and its unique ...
15
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2answers
1k views

Four-dimensional light bulbs

In reaction to Three-dimensional light bulbs - rules are same (almost) This is a four-dimensional Akari puzzle (also known as Light Up). The nine squares represent the layers of a $3\times3\...
15
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1answer
320 views

Statue View: 2, 3, 5, 7

This is another Statue View puzzle. It's easily the hardest of the three I've made, so I recommend trying the other two as practice first. Rules of Statue View: Shade some cells of the grid to form ...
15
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1answer
392 views

Kropki Sudoku – Sudoku based on the relation between neighbouring numbers

This puzzle is named Kropki Sudoku. The classic sudoku rules apply: Place numbers on the grid below such that each row, column and 3×3 box contain the numbers 1 to 9. A white dot indicates that the ...
15
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1answer
667 views

HAISU with a twist

HAISU is a grid-deduction puzzle designed by this site's very own TheGreatEscaper. To quote them: HAISU is a portmanteau of three Japanese words - 'hairu', to enter, 'su', number, and 'hausu', an ...
15
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1answer
1k views

Sum in A Sudoku

Color Blind version: Here's a sudoku puzzle with a twist! The numbers given in the squares are actually the sum of the numbers in that region. For example: 18= Sum of the numbers in the 4 yellow ...
15
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2answers
810 views

Tetromino Sudoku

An entry in Fortnightly Topic Challenge #32: Grid Deduction Hybrids The grid below, when filled in, forms a valid Sudoku grid. It can also be filled in like a LITS (nuruomino) puzzle without the 1x4 ...
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1answer
588 views

Mini Ripple Effect puzzles

I enjoyed this puzzle so much that I created some mini versions of it for fun. I signed up to share them with everyone. The rules are the same: Each region with n cells contains all the numbers from 1 ...
15
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1answer
353 views

“Is dot a fact?”

You're presented with a five-by-five grid of dots. Each dot is assigned a label from 1 to 25 going across the rows and down. Thus, the top-left dot is number 1; the bottom-left dot is 21. Your job ...
15
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1answer
532 views

Finding the hidden path (new grid puzzle concept?)

I was toying around with grid-based puzzles, and I can up with a format that I'm not sure exists yet, and from my testing leaves only one solution. (If it exists or is broken, please let me know so I ...
14
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3answers
1k views

A King's Hamiltonian Tours

a) Place the numbers 1 to 25 in the cells of a 5 x 5 board in such a way that consecutive numbers occur in adjacent cells either vertically, horizontally, or diagonally, and so do cells with numbers 1 ...
14
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2answers
951 views

(1 of 11: Numberlink) What is Pyramid Cult's Favorite Activity?

Dear PSE users and moderators, I’m new here in PSE, but I really need your help. There was this person who gave me a black envelope consisting 10+1 pages of puzzles, and also a scribble saying: “Find ...
14
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2answers
513 views

Adderlink: Almost symmetrical

Rules: Hey, this looks like slitherlink! In fact, it is two slitherlinks added together. So both of the two slitherlinks have clues in exactly the same locations as this grid below. Furthermore, a 2 ...
14
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2answers
434 views

(Indonesian) Fill-In Puzzle

I made this seasonal puzzle to celebrate the upcoming Eid al-Fitr in Indonesia. So actually there are four thematic hidden phrases that can be found after solving the puzzle. But because they are ...
14
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3answers
421 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. ...
14
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2answers
660 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
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1answer
300 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
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2answers
746 views

Trapezoids Compound Hidden Puzzle

UPDATE To refute Sconibulus's answer, I drafted a second puzzle with identical rules. 7 months ago, I released a collection of variations of an original puzzle called Trapezoids, but never mentioned ...
14
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1answer
569 views

Why you shouldn't buy cheap puzzle books

Backstory contains important information, but nothing hidden. Also, tl;dr parts are bolded, but I can't guarantee I didn't forget bolding some part. Recently there's been a grid-deduction craze here ...
14
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1answer
403 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
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2answers
604 views

Double n-queen puzzle, with sudoku rules

Put 9 blue queens and 9 pink queens, with rules : If the blue queens removed, each pink queens do not attack each other. If the pink queens removed, each blue queens do not attack each other. Each 3×...
13
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2answers
683 views

Slitherlink Fillomino hybrid

This puzzle is a combination between a Slitherlink and a Fillomino. You should put a number in each square and draw a single closed loop over the grid such that the following properties are satisfied:...
13
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2answers
369 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, ...
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2answers
982 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 ...
13
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2answers
664 views

Sudoku variation: Using various chess moves, solve the grid from just two numbers

I've been watching a youtube channel hosted by puzzlers and attempting the sudoku variation they post each day. Today's I found particularly interesting and while sharing it around it proved quite the ...
13
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1answer
532 views

A Puzzle in The Two Towers

Our local used book store is going out of business, and I ran in to pick up another copy of Lord of the Rings. When I picked up a likely copy, a scrap of paper fell out of The Two Towers...I've done ...
13
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1answer
344 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
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1answer
707 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
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2answers
453 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 "...
13
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2answers
559 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
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1answer
757 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 ...
13
votes
1answer
320 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 ...
13
votes
1answer
440 views

Tapa - Confluence

This is a Tapa puzzle. Rules of Tapa: Shade some cells of the grid. Shaded cells should form a single [orthogonally] connected group; no 2×2 square should be fully shaded. Some cells have ...
13
votes
1answer
359 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 ...
13
votes
1answer
476 views

On The Subject of X-Rays

(This is part of a series of puzzles written for Timwi for a Secret Santa puzzle exchange, themed around various custom modules for the game Keep Talking and Nobody Explodes. No KTaNE knowledge is ...
13
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1answer
501 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, ...
13
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1answer
620 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 ...
13
votes
1answer
658 views

Hexagonal Kurokuron

Kurokuron (クロクロ一ン: "black clone"), is a shading puzzle that first appeared in Puzzle Communication Nikoli issues 153-155. Identical rules apply to a hexagonal grid. Rules Shade some cells such that: ...
13
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1answer
230 views

Tribute to Clifford Possum Tjapaltjarri

The background text that follows is in this case not part of the puzzle, nor fictitious. The puzzle, which is self-contained, consists entirely of the image below; I have composed it as a genuine (...
13
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1answer
265 views

Unpainted Masyu

Exactly 3 of 7 circles here should be painted black to make the Masyu uniquely solved. Find them!
13
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1answer
253 views

Follow the path of relation through the grid #1

There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can ...
12
votes
5answers
2k views

Move the coin in the color grid

You need to move the Coin from the S(tart) cell to the END cell. Rules: From S you can move to cells 2,7 or 8. From BLUE cells you can only move ONE space diagonally. From YELLOW cells you can only ...
12
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3answers
729 views

3D Crossword, Cryptic, Statue View & Maze

The following image depicts the layers of a $5\times5\times5$ cube. Using 3-dimensional thinking, can you find the way out of the cube? Empty version with no crossword numbers Empty version ...
12
votes
2answers
854 views

The Peculiar File

So I was browsing through my computer files earlier and I found a file I'd not seen before. I was wondering if you guys could help me figure out what it's about. This is where I found it: This is ...
12
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3answers
590 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 ...

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