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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5
votes
1answer
297 views

Election Day is upon us!

Some election mayhem! Any puzzlers here or regulars excited? This is a picross or nonogram, for information about it and how to approach, please go here. Wanted to make my first short and easy ...
5
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1answer
81 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 ...
5
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2answers
261 views

Word Rectangle #2

As with my previous puzzle, this is an unfinished word rectangle: Can you fill in the blanks? When completed, every row will contain a common English word with five letters, and every column will ...
5
votes
3answers
254 views

Fill $N$ by $M$ grid with numbers in such a way that any given cells' neighbors are different

Create an $N$ by $M$ grid with numbers in such a way that satisfies following conditions: numbers should be integers that range from $1$ to $r$. for any cell $C$, all its adjacent neighbors (i.e. ...
5
votes
1answer
170 views

Sums to a square number

arrange the numbers 0 to 9 in the circles below, following these rules : Every row of 3 or 4 circles sums to a square number. Every diagonal of 3 circles sums to a square number. Every green circle ...
5
votes
1answer
999 views

Difference square logic (5x5)

Rules : Arrange numbers 1 to 25 to the squares, and each number only occurs once. Green squares are the difference from its left square and its right square. Green squares are also the difference ...
5
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1answer
204 views

Is ambiguity prevention sufficient reason to infer a clue?

I decided to work my way through Simon Tatham's puzzle collection to broaden my puzzling skills, and have reached the game Dominosa I have a subboard below, where I've eliminated the possibility of 9/...
5
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1answer
143 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 ...
5
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2answers
281 views

A game of cricket

This puzzle is part 14 of Gladys' journey across the globe. Each part can be solved independently. Nevertheless, if you are new to the series, feel free to start at the beginning: Introducing Gladys. ...
5
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2answers
203 views

SafeCracker #2 - The Mission Continues

Thanks to an alert StackE user, we were able to get the first safe open. Mission Details This next safe is in a former employee's house. He is gone for now, so we have no time to spare. We weren't ...
5
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1answer
302 views

Modified Intersection Puzzle

This is a slightly modified version of the Intersection Puzzle introduced by user477343 here. In this case, you are given a $7 \times 8$ grid with circles and boxes provided in some of the cells. ...
5
votes
1answer
339 views

Stuck in 6x6 skyscraper puzzle

I don't know how to continue, can anyone tell me which next number am I able to add? Here is the puzzle (there are clues at edges), and below are possibilities. Feel free to tell me if I made mistake, ...
5
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2answers
226 views

Where did my uncle go?

That damned uncle of mine! Running out without telling us has become too commonplace in our house. I did manage to find these two nonograms and a note this time though. "Fear not nephew! I am ...
5
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1answer
162 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 ...
5
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1answer
131 views

Masyu turned vanilla

Tried to make something clever, but it didn't work out so you're getting a vanilla masyu instead. Normal masyu rules apply.
5
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3answers
384 views

Haisu: MathGrant

HAISU is a portmanteau of three Japanese words - 'hairu', to enter, 'su', number, and 'hausu', an English borrow word meaning house, of course. Together, we get a meaning of 'enter number house', ...
5
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1answer
192 views

Triple (Almost) Gaps - Schezo's Edition

Today (Mar 16) is Schezo's birthday! Happy birthday my little creeper boi~ <3 Clarifications: $C$ may or may not be equal to $1$. The set actually tells you that at least one of $\{C,M,N,P,R,T\}$ ...
5
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1answer
264 views

Haisu: Pink Rose

HAISU is a portmanteau of three Japanese words - 'hairu', to enter, 'su', number, and 'hausu', an English borrow word meaning house, of course. Together, we get a meaning of 'enter number house', ...
5
votes
1answer
209 views

Square Spin #3: Hickory Dickory Dock

Square Spin History: #1>#2>#3 Recap of the Rules Basic rules from #1 Ambiguity, Un and Re squares from #2 Problem #3: Hickory Dickory Dock The mouse ran up the clock. ...but ...
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2answers
196 views

Bullet Drop™ #1

Concept Here is a basic example grid: AB 1\/ 2\/ ×× The player must first modify the grid by switching the slashes \ and <...
4
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1answer
304 views

Can someone, please, help me to solve this level of the game „Flow Mania”?

It's very hard for me to solve this level. I just can't figure it out! Rules: Draw a lines to connect like-colored dots. A complete solution will utilize every empty square in the grid.
4
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1answer
156 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 ...
4
votes
2answers
324 views

Find the ? in this grid

Find question mark in this grid with numbers. csv version: 9,6,7,3 2,4,7,6 4,1,5,8 3,0,3,? Hint: You use all numbers to find ? and it is much more simple ...
4
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2answers
201 views

Modified Futoshiki

This is a modified Futoshiki Place the numbers 1 to 5 such that each row, and column contains each of the digits 1 to 5. Squares with same color, contains each of the digits 1 to 5 too.
4
votes
1answer
838 views

Can you solve this kakuro puzzle?

This kakuro puzzle comes from the newest edition of Topple, an indie puzzle magazine I run. For those who are unfamiliar with kakuro, here are some instructions: Kakuro consists of a blank grid with ...
4
votes
2answers
88 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 ...
4
votes
1answer
118 views

The revenge of 3D light bulbs

This is a three-dimensional Akari puzzle (also known as Light Up). The five squares represent the layers of a $5\times5\times5$ cube, top to bottom. The objective is to add light bulbs into any number ...
4
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1answer
299 views

Treasure of the fancy island

The colored rectangle below is the map of a fancy island. There is a treasure hidden there, but instead of the usual X on the map to depict the location of the treasure you have the following clues ...
4
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1answer
134 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 ...
4
votes
1answer
91 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 ...
4
votes
2answers
236 views

Sto-stone puzzle

Sto-stone is a puzzle made by Nikoli. Here are the rules: You must color the cells with black with the following rules: There are rooms enclosed in bold lines. The number on the room shows the ...
4
votes
1answer
126 views

RPS Trinity - Teddy and Her Ribbon

The Rules of RPS Trinity: You are given a board with its tiles colored either black or white. Put Rocks (denoted by letter R), Papers (denoted by letter P), and Scissors (denoted by letter S) on ...
3
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4answers
688 views

Flow Free Favourites

Recently, I have been amusing myself with the interesting puzzles provided by the excellent Flow Free puzzle app. Since I couldn't find a way to bookmark my favourite puzzles, I took up a habit of ...
3
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2answers
405 views

Another Determinant Sudoku

sudoku-determinant have been described well here : The Determinant Sudoku I have created another one. Number in the center is the value of the determinant Numbers 0 to 10 are the values of the ...
3
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1answer
118 views

Fill up the grid with the letters 'P', 'U', and 'Z' in the following way

Fill up the grid, , so that the letters '$P$', '$U$', and '$Z$' occur the same number of times both column-wise and row-wise, as well as diagonally for all diagonals with a number of cells that is a ...
3
votes
1answer
361 views

What in this world is she trying to say?

I happened to meet one of my friends after about a couple of years. Obviously we both were very happy, but still, she didn't leave her habit of challenging me to decipher what she was saying. I ...
3
votes
2answers
474 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 ...
3
votes
1answer
1k views

What is the answer to this IQ test problem?

What is the answer to this IQ test problem? Justify your reasoning.
3
votes
1answer
189 views

Fill the table so every consecutive 3 numbers sums to 50 or 100

Arrange numbers 1 to 40 to the table with rules: Multiple of 4 Numbers and some perfect square numbers are already there as guide. Every 3 consecutive numbers with pattern white-yellow-white, must ...
3
votes
1answer
272 views

Albrecht Durer Inspired Magic Square

A magic square is an n-dimensional matrix in which each row, column, and main diagonal sums to the same 'magic number' (denoted by s). A normal magic square uses each of the numbers from 1 to n ...
3
votes
1answer
242 views

An unknown Cryptogram

I would like to say : vyycd gow mcgr uuey
2
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5answers
827 views

Very tricky nonogram - where to go next?

I've become somewhat addicted to Simon Tatham's "Pattern" (nonogram) puzzles recently. I thought I was becoming fairly adept with them, but this unusually difficult one has me stumped. I've got as far ...
2
votes
1answer
684 views

Move 2 or 3 spaces in this 5 by 5 grid

You have a 5 by 5 Board as shown. You start from the S (Center) position. You can: 1 Move TWO or THREE spaces only 2 You can move Vertically or Horizontally or Diagonally but only in a straight ...
2
votes
2answers
79 views

Does it exist a way to solve visually by using a grid or to find the truth among a set of five people telling different statements?

I am having problems with trying to solve this riddle therefore I am looking for help. The situation is as follows: At a semiconductor laboratory in Hsinchu a security guard caught five ...
2
votes
1answer
110 views

4x4 square mapping to tick

I cannot see any pattern in how the top left box maps to the top right box.
2
votes
1answer
190 views

Solve the pattern! (game)

Okay, so this is based off of https://www.chiark.greenend.org.uk/~sgtatham/puzzles/js/pattern.html And, my cousin made a random pattern and gave it for me to solve. Unfortunately, the logic is ...
2
votes
1answer
390 views

Numberlink strategy

Note: This is not asking for a general strategy, you can find that here. Is the following a valid strategy in solving Numberlink (Flow Free) puzzles (I like to call it 'unwrapping the grid'): ...
2
votes
1answer
181 views

Arrangement at the puzzling class

PSE open a puzzling class. 16 students join the class. the classroom have 16 chairs arranged in (4 x 4) grid. ...
2
votes
1answer
190 views

Fixing a Binairo Mistake

The rules of Binairo are simple: 1) Each row and column must have an equal number of black and white circles. 2) There can be no horizontal/vertical line of three like-color circles. Starting ...
2
votes
1answer
107 views

Heyawake - help continue puzzle (2)

Hint needed. The cells marked with dots must be white.