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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My Fill-the-circles puzzles (Set #3)

In each puzzle, fill the circles with the numbers 1, 2, 3, ... n, where n is the number of circles in such a way that consecutive numbers are NOT in circles that are joined by a line.
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1 vote
2 answers
238 views

9x9 Sudoku Puzzle

This is a standard 9x9 sudoku puzzle from a book I hope to publish:
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2 votes
1 answer
109 views

My Fill-the-circles puzzles (Set #2)

In each puzzle, fill the circles with the numbers 1, 2, 3, ... n, where n is the number of circles in such a way that consecutive numbers are NOT in circles that are joined with a line. I designed all ...
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6 votes
1 answer
138 views

My Fill-the-circles puzzles (Set # 1)

In each puzzle, fill the circles with the numbers 1, 2, 3, ... n, where n is the number of circles in such a way that consecutive numbers are NOT in circles that are joined with a line.
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1 vote
1 answer
133 views

More of my Find-the-stars puzzles (Set #2)

Find-the-stars instructions: A Find-the-stars puzzle is played on a square grid that is initially empty except some squares contain arrows. The goal of the puzzle is to fill some empty squares with ...
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9 votes
2 answers
337 views

Three of my Find-the-stars puzzles

Find-the-stars instructions: A Find-the-stars puzzle is played on a square grid that is initially empty except some squares contain arrows. The goal of the puzzle is to fill some empty squares with ...
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1 vote
1 answer
141 views

Honeycomb puzzle with hexagons [closed]

Can you place the numbers 1 through 9 in the honeycomb so that the sum of the numbers in the adjacent hexagons is a multiple of the number in the hexagons? This must be true in all hexagons. The top ...
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16 votes
2 answers
2k views

Colour in a 5 by 5 grid, with evolution rules, so that the starting grid is the same as the output grid

Colour in a 5 by 5 grid using the colours Red, Blue, Green and Yellow. Each cell is considered to have 4 neighbours (to the left, right, above and below.) The grid wraps, so e.g. the top right is a ...
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  • 193
10 votes
1 answer
757 views

How to solve this Pentomino puzzle?

The following Pentomino board has exactly one solution: The solution is known: I'm trying to solve this board manually, but it is so difficult that I came to believe it is impossible. I noticed ...
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  • 289
4 votes
2 answers
173 views

Rong-rong (ring-ring variation)

I was thinking about ring-ring puzzle. Suddenly, the 'word' rong-rong came to my mind and made me laugh for no reason. So, I'm messing around with ring-ring rules that fit the rong-rong 'word'. Rules:...
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  • 908
5 votes
2 answers
604 views

Next step in this Slitherlink puzzle?

I am playing this Slitherlink app on Android, and get stuck on this puzzle at the following state: I made a lot of progress on the right side, but after this I couldn't find anything that I can do, ...
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  • 3,461
18 votes
2 answers
838 views

A Simple Loop with A Poetry?

Who is he really? Please answer this question of mine Starting from the top-leftmost white cell and then You are still going clockwise by Taking the letters where you are turning left but Not, once ...
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  • 33.7k
7 votes
1 answer
2k views

Is the "rocket" pattern inversible?

The rocket pattern in slitherlink is when a 3 sees a 1 in a diagonal, with two crosses (the exhaust) on the opposite side. 3 x 1 x two lines can be added ...
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  • 295
6 votes
2 answers
344 views

How to prove Yin-Yang alternating 2 by 2 is not allowed

Yin-Yang is a puzzle where one needs to fill each cells with either black circle or white circle following these rules: Each color's circles must be connected to one another according to four-way ...
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  • 61
5 votes
3 answers
215 views

The Wrong Products

Rules: Place each number from 1 to 12 exactly once such that every row and column contains exactly two numbers. Clues outside the grid show the product of the two numbers in that row/column. However, ...
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  • 908
0 votes
0 answers
56 views

Can every Sudoku puzzle be solved without brute force? [duplicate]

So I wrote up an algorithm for generating Sudoku boards, and it generated the following board: I was trying to solve it on my own and got stuck, which prompted me to try putting it in this website. ...
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12 votes
1 answer
534 views

A massive synonym

Please explain how to assemble the puzzle. Yes, one is missing, but you can follow the >. No computers. Hint: Hint 2: Hint 3: Text version: ...
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  • 12.8k
11 votes
5 answers
4k views

What is the next move on this minesweeper board?

Here is the board I found an online minesweeper solver which can deduce what the next move is, so I know what the next move is and that it is logically obtainable. But it doesn't offer much help in ...
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3 votes
2 answers
227 views

SNES Super Picross - Mario SP-I

Currently stuck on Super Picross and looking for a hint for the next logical deduction on Mario stage SP-I.
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  • 33
13 votes
1 answer
590 views

Mega Circles And Squares

Since recently Athin showed Circles And Squares, a genre which I invented and am very proud of, I thought "Hey, why not give another one!" But this time, I'm sharing one that I made for both ...
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12 votes
2 answers
805 views

Circles and Squares - A Grid Puzzle

This relatively new grid puzzle genre is invented by Anonymus25. Rules of Circles and Squares: Shade some cells so that all shaded cells form one orthogonally connected area and each orthogonally ...
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  • 33.7k
3 votes
1 answer
278 views

A tough sudoku puzzle

Here is a tough sudoku puzzle from my blog
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-2 votes
1 answer
222 views

Easy Sudoku Puzzle

This is an easy sudoku puzzle (no. 90) from my blog.
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4 votes
2 answers
782 views

Tic-Tac-Collatz

Have you ever heard of the Collatz conjecture? Just in case you haven't, I'll summarize it for you! Take any positive integer $n$, if it is even then simply divide it by $2$; however, if it is odd, ...
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-6 votes
1 answer
174 views

Two Day Slitherlink [closed]

I recently learned what a Slitherlink puzzle is; from here, so I tried my hand at making one! This is a normal 7x7 slitherlink, but with the added restriction that the loop must form the number 2 in ...
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  • 3,771
-5 votes
1 answer
153 views

Slitherlink #1 - Very Simple [closed]

This is a simple slitherlink, which is very easy. The rules are as follows (suggested by @bobble and @PuzzlingFerret): There can be multiple loops. The final solution should be a shape. Congrats to ...
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22 votes
1 answer
886 views

Snakes and Adders - A New Grid Puzzle

So, literally last night, I dreamt of this new grid puzzle genre, so I'm just giving it a shot... Rules of Snake and Adders: Put some snakes into the grid on the white cells. Each snake forms a ...
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  • 33.7k
34 votes
1 answer
2k views

Can you solve this gogen puzzle?

I created this gogen puzzle myself: Add the 25 letters between A and Y to the grid above. Each one should appear exactly once. When you have finished, you must be able to spell the following words ...
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11 votes
1 answer
696 views

→Triple Hokuro←

Hokuro is a grid deduction puzzle inspired by Kakuro. Basic Hokuro rules Each cell contains one of the following symbols: Each arrow indicates a step in that direction, while the dot indicates no ...
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  • 4,298
6 votes
1 answer
779 views

Binary Sudoku Puzzle

The rules of Binary Sudoku are quite simple. It is very similar to regular Sudoku, except here we try to fill a 9x9 board with only black and white tiles following the below rules: Every row, column, ...
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2 votes
2 answers
192 views

Mario's Super Picross - Stage Mario 9-K

I'm playing through Mario's Super Picross currently and after nearly 200 puzzles this one finally has me stumped as to how it is intended to be solved. What is the next step to solving this? Notes: ...
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  • 13.8k
15 votes
1 answer
411 views

Cartological Cats: A Snaky-Loop Grid Puzzle with Cat-Shaped Matchmaking Clues

This is written for calica for a Secret Santa puzzle exchange. The original version in a printable PDF format can be found here. Dear calica, Thank you so much for being an amazing person this year! ...
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  • 33.7k
0 votes
1 answer
110 views

Is X-Sudoku easier to solve than classic Sudoku [closed]

X-Sudoku has extra rule for diagonals which give extra hints for diagonal cells. Does this implies that solving X-Sudoku puzzles are easier than classic Sudoku puzzles?
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26 votes
1 answer
2k views

What is this puzzle?

$$\huge\text{This puzzle is _______}$$
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4 votes
3 answers
932 views

Finding a Kakuro trick

The following screenshot is taken from the Android app Kakuro++ (level 9 riddle 12) And I verified the current status within the app. I managed to solve the puzzle by guessing a 50/50-number and ...
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10 votes
1 answer
254 views

Snowcaps - A grid deduction puzzle

This winter-themed puzzle is basically an upside-down Aquarium, the idea being that instead of fish tanks being filled with water, the areas are mountains being covered with snow. The goal is to shade ...
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  • 23.9k
20 votes
1 answer
558 views

PSE Advent Calendar 2021 (Day 24): The Witneys - Your Comfy Puzzles

This puzzle is part of the Puzzling StackExchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 200 reputation.< Previous Door Your great-grandmother ...
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  • 33.7k
28 votes
1 answer
686 views

PSE Advent Calendar 2021 (Day 20): Candy Cane Sudoku

This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door > So I was ...
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  • 23.9k
11 votes
1 answer
507 views

PSE Advent Calendar 2021 (Day 19): Santa's Dilemma

This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 100 reputation.< Previous Door Next Door > It was ...
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  • 1,559
12 votes
1 answer
454 views

PSE Advent Calendar 2021 (Day 17): That's the way the cookie crumbles

This puzzle is part of the Puzzling StackExchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door > In our house,...
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  • 23.9k
17 votes
2 answers
579 views

PSE Advent Calendar 2021 (Day 15): Optics Experiment

This puzzle is part of the Puzzling StackExchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door > Optics ...
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  • 484
9 votes
2 answers
482 views

Christmas tree LITSO

Inspired by PSE Advent Calendar 2021 (Day 13): A Christmas Hokuro, I challenged myself to create a Christmas tree-shaped puzzle. Unfortunately I had to edit the shape a little bit because... reasons. ...
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  • 10.6k
15 votes
1 answer
633 views

PSE Advent Calendar 2021 (Day 13): A Christmas Hokuro

This puzzle is part of the Puzzling StackExchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door > Hokuro is a ...
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  • 4,298
7 votes
3 answers
203 views

Place digits from 1 to 7 into each row and each column of the grid once. Numbers in the circles give the product of the four surrounding digits

What is the way to resolve the following puzzle? Link to source. It's from a taiwanese math olympiad held in 2005.
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  • 71
13 votes
2 answers
628 views

PSE Advent Calendar 2021 (Day 4): Decorating with Ingrid Deduction

This puzzle is part of the Puzzling StackExchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 50 reputation. < Previous Door Next Door > "...
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  • 23.9k
15 votes
2 answers
725 views

PSE Advent Calendar 2021 (Day 3): Tentai Show

This puzzle is part of the Puzzling StackExchange Advent Calendar 2021. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door > Divide the ...
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  • 67k
5 votes
1 answer
263 views

10x10 Fillomino

Interactive solving website For help/rules on solving, please look at the website's "help" section, which lists fillomino rules. Please use the website to solve the puzzle unless you are ...
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16 votes
2 answers
1k views

The Golden Age of Sudoku

Rules: Each cell contains one of the following symbols: A23456789TJQK. No two cells in the same row or column have the same symbol. The grid is divided into 11 square regions of different sizes. A ...
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  • 6,569
4 votes
1 answer
807 views

Am I able to mark mines with the bottom row of 3's?

Am I able to use the bottom row of 3's to know what some of the squares around it are?
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  • 183
4 votes
2 answers
469 views

Very close to solve the sudoku puzzle but yet not solved

I found an X-Wing pattern using 1's on r29c48 and eliminated the 1's on r1c8, r3c8, r7c8, and r3c4. Lots of elimination but that was not helpful for me to crack it. I think I am very close to solving ...
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