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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6
votes
1answer
426 views

ASCII Art Painting

I've been taking an art course recently, and I met someone who was proficient with grid ASCII art paintings. However, the teacher of the class always seemed to think there was something wrong with his ...
6
votes
1answer
287 views

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 ...
6
votes
1answer
176 views

Restoring 3D Tetromino Puzzle

You won't believe this. I worked all night to make a new 3D tetromino puzzle, and just as I was about to save the final version there was a power outage! Now I can't remember what the final clues were ...
6
votes
1answer
175 views

3D nonogram – The one-thousander

This is a three-dimensional nonogram. The first ten squares depict the layers of a $10\times10\times10$ cube. The final square gives the enumerations for the Z-axis, top to bottom. Some rules: If a ...
6
votes
1answer
303 views

My featured entry

Mosaic is a Minesweeper-like puzzle based on a grid with a pixel-art picture hidden inside. Using logic alone, the solver determines which squares are painted and which should remain empty until the ...
6
votes
1answer
202 views

3D tetromino placement

The following image depicts a $5\times5\times5$ cube. Insert any number of the pictured 3D-tetromino pieces into the cube to satisfy the conditions listed below. Pieces may be rotated in any direction....
6
votes
2answers
205 views

You Sign Me Right Round (Extended Edition)

I wanted to ask more questions about variations on This Problem. If you hadn't seen that one, check it out. It's required reading (and probably more fun). In the original problem, these were the ...
6
votes
1answer
197 views

Academic Snake Pit

One day, you get lost in the corridors of your new school and accidentally wander into a pit full of venomous snakes. Unfortunately, the pit is deep and you have hurt your leg in the fall, so there is ...
6
votes
1answer
137 views

The Terrible Twos of Slitherlink Part Deux

Please read and understand my first question before proceeding. This one should be worse. pdf files I uploaded to Dropbox: Slitherlink of Twos Their solutions These puzzles were generated by ...
6
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1answer
200 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 ...
5
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2answers
668 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 ...
5
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4answers
963 views

Sum in a sudoku with sum total of 15 and 45

I have created a sudoku puzzle with the following restrictions: Each row and column sum to $45$. Each row and column in the nine $3$ by $3$ sub-grids sum to $15$. Is such a sudoku unique?...
5
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4answers
240 views

Fill the grid (pattern)

Can you guess what comes in place of the question mark? Here's a text-based version of the table: ...
5
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2answers
134 views

3D Nonogram - Spinoff of the Reboot

This puzzle is inspired by recent 3D nonogram puzzles by Jafe and Omega Krypton. Check those out if you want, but they are not required to understand this puzzle. This 3D nonogram has clues with two ...
5
votes
2answers
782 views

Special Sudoku, with windows pattern

Solve this Sudoku, with rules : Every blue square means, it is the left-top of a 3x3 block with each numbers [1 to 9] appearing only once there. There is only one unique solution. Check the example. ...
5
votes
2answers
440 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: ...
5
votes
1answer
293 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
votes
2answers
255 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
247 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
984 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
votes
1answer
201 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
votes
2answers
269 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
votes
2answers
199 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
votes
1answer
296 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
277 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
220 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
125 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
379 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
votes
1answer
191 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
259 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', ...
4
votes
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
votes
1answer
297 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
votes
2answers
323 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
votes
2answers
200 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
768 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
1answer
103 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
votes
1answer
294 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
votes
1answer
48 views

Ambitious Puzzler's Masyu

Contrary to the lazy puzzler, the creator of this masyu is too ambitious that he adds not only one but two extra stones, so the puzzle is unsolvable. Finish his job for him by removing those ...
4
votes
2answers
194 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
122 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 ...
4
votes
1answer
33 views

Heyacrazy: Forks

This is a Heyacrazy puzzle. Rules of Heyacrazy: Shade some cells of the grid. Shaded cells cannot be orthogonally adjacent; unshaded cells must be orthogonally connected. When the puzzle is ...
3
votes
4answers
682 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
votes
2answers
400 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
votes
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
355 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
462 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
239 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 ...