# 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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### 3D Statue Park: Daggers and dashes

This is a three-dimensional Statue Park puzzle.1 The five squares in the below image depict the five levels of a $5\times5\times5$ cube. The goal is to fit inside it the eight pieces shown in the ...
301 views

### Latin Square Puzzle - Difficult

Follow on puzzle from the introductory Latin square puzzle post. The rules It’s a Latin square like sudoku, so there must be the numbers 1-9 exactly once in every row and column. Notice that each ...
294 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. ...
472 views

### Simple grid deduction puzzle

I will let you figure the rules of this one yourselves. Here is the empty grid to assist solvers. Here is a text version of the grid: ...
305 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 ...
727 views

### Incomplete Word Rectangle

This is an incomplete word rectangle: When completed, every row will contain a common English word with four letters, and every column will contain a word with five letters. All of these are common ...
580 views

### 36-length snake in a 6x6 grid

Based on https://brilliant.org/weekly-problems/2017-05-29/advanced/?p=4 We need to fill a 6x6 grid using the numbers 1-36, each cell having a single unique number, such that: Every two consecutive ...
141 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 ...
971 views

### SafeCracker #3 - We've Been Blocked [closed]

Our Last Safe To Conquer Ok, team, this one might give us a little trouble. Nothing we can't handle though... let's go... This safe model is "The NevaCrak 9000" - the most secure safe there ...
1k views

### Help! Can you get my puzzle back?

Puzzling has a lot of really complicated stuff these days, so I just wanted to post a simple Boggle grid. You know that game, right? You form words by starting from one letter, then taking adjacent ...
1k 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&...
460 views

### Chain Puzzle: Tabletop Games #08 - Targui, or not Targui

This is the eighth Chain Puzzle in the Tabletop Games series, in which all puzzles are themed around board games, card games, tile games, and the like. The answer to this puzzle is a thematic word or ...
827 views

### On The Subject of Battleships

(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 ...
566 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 ...
648 views

### Chain Puzzle: Tabletop Games #06 - So Sorry

This is the sixth Chain Puzzle in the Tabletop Games series, in which all puzzles are themed around board games, card games, tile games, and the like. The answer to this puzzle is a thematic word or ...
728 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 ...
301 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 ...
633 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×...
602 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 "...
977 views

### A Shingoki Puzzle

This is a Shingoki puzzle. Rules of Shingoki: Draw lines between the dots to form a single loop without crossings or branches. The loop should pass through every circled number in the grid. For ...
300 views

This is a Slitherlink puzzle, being played on the surface of a 3D object, a Rhombicosidodecahedron. If you are not familiar with Slitherlink puzzles, I don't suggest starting on this one. Rules in ...
341 views

### Tetromino Nurikabe: Five Fours

I enjoy combining polyominos with grid-deductions. My current plan is to create a Pentomino Nurikabe. But that sounds hard, so I made this Tetromino Nurikabe as practice first. I think it came out ...
352 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 ...
711 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 (...
382 views

### Office Park: A Grid Deduction Puzzle

This is an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the community I had an idea for what I think is a new grid deduction puzzle which has some aspects of ...
769 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 ...
327 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 ...
256 views

### Lazy puzzler's masyu

The creator of this masyu forgot to add the final stone, so the puzzle remains incomplete. Finish his job for him by placing one additional stone (either black or white) on the board so that the ...
405 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 ...
555 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.) ...
436 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 (<...
293 views

### Akari: The Light

Rules (taken from Nikoli): Place light bulbs (circles) according to the following rules. Light bulbs may be placed in any of the white squares, the number in the square shows how many light ...
606 views

### Tetromi-nuri-doku

Note: This puzzle was inspired by the one here, by Mike Q. Every square in the grid above, when the puzzle is complete, has a number between 1 and 9 in it and either is shaded or is not. Each 3x3 ...
352 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 ...
483 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 ...
678 views

### Cryptic Crossword Sudoku

This puzzle is inspired by Matt’s excellent Cryptic Sucrosswordoku. Below is a sudoku as well as some cryptic clues. The clues lack enumeration and are in no particular order. The solutions to the ...
633 views

### I'm Bad at Naming Things, so Just Try to Solve this Patterned Masyu Puzzle!

The original Masyu rules apply. Make a single loop with lines passing through the centers of cells, horizontally or vertically. The loop never crosses itself, branches off, or goes through the same ...
392 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 ...
328 views

### Not Just Black and White

Answer for this puzzle is one word. Have fun! Highlighted parts are where I realised I have clued it wrong... Sorry for all this inconvenience! Hint: usefulness level 1 usefulness level 2 This ...
505 views

### The Knights and the Hounds

(With thanks and congratulations to Lee Leon) We rejoin our heroes several days after the events of The Knights' Gift, at the head of a pack of enormous staghounds, 1000 strong. Such a pack ...
384 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 ...
386 views

### Nono-cube - Ultimate Puzzle Giant

Prologue - Instructions Shamelessly copied and pasted the following from @jafe's puzzle :P This is a three-dimensional nonogram. The first square gives the enumerations for the Z-axis, top to ...
378 views

### Puzzles: Meander

I have come up with an interesting type of puzzle based on the mathematical concept of a meander. The concept, of course, is not original to me, but the type of puzzle is, as far as I know. A ...
232 views

### Nono-Cube: Approach at Your Own Risk

Inspired by jafe's 3D nonograms :) Answer is one word. This puzzle is a part of Ooohh, it all makes sense now! :D
408 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 ...
281 views

### Friday's Dominosa Problem

Dominosa is a logic puzzle with a similar feel to Sudoku, and I've recently added it to Donimoes, my collection of domino puzzles and games. Given a grid of numbers, you have to lay out the dominoes ...
282 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 ...
436 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 ...