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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.

6
votes
1answer
129 views

Statue Park: Five

This is a Statue Park puzzle (originally constructed for the 2019 24-Hour Puzzle Championship, as part of a Tarot card themed set -- no prizes for guessing which rank this puzzle was). Rules of ...
3
votes
2answers
120 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. ...
21
votes
2answers
269 views

Untitled, for Now

As you step into the gallery, you notice an interesting piece of art hanging on the wall. "I like the piece, but what's with the title?" you ask the docent. "I'm used to obscure titles in modern art, ...
-7
votes
2answers
135 views

The Guys - Logic #3 - The Casino

Oh boy, the guys went to the casino.. Let's see what these three are up to tonight. I wonder if going to the casino was a good idea?? Maybe for a couple of them. Start the two minute timer... The ...
-5
votes
1answer
92 views

The Guys - Logic #2 : Ways to work

So the guys are back. This time, they decide to change up their way to work. Let's see what they're up to... Start the two minute timer... 1. Since Anthony and Charles weren't taking the bus today, ...
17
votes
3answers
962 views

Hexagonal Grid Filling

Fill in each blank white hexagon with a digit from 1 to 9. Each of the grey hexagons is the sum of the white hexagons around it, and all of the white hexagons that are around the same grey hexagon ...
5
votes
4answers
200 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: ...
60
votes
4answers
4k views

Gerrymandering Puzzle - Rig the Election

The following graphic is a map of the country Mathlandia: You are currently running for reelection, but the polls aren't exactly in your favor. Each square in this grid is a county. Counties with a ...
-4
votes
10answers
877 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 is. ...
5
votes
2answers
189 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 ...
15
votes
2answers
2k views

Virus Detected - Please execute anti-virus code

Virus Detected!!! Your computer, which is represented by the grid pictured, has been infected. The bugs are clearly marked. It's your job to inject your awesome anti-virus code in the proper computer ...
1
vote
3answers
221 views

Can someone solve this kakuro?

Can someone solve this? Please tell me how you did it. Source: Puzzle Page app
12
votes
2answers
529 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 ...
5
votes
1answer
258 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. ...
3
votes
1answer
197 views

Square Spin #1: Sun and Moon

Defining Square Spin Lets play a game! The aim of this game is to transform one image into another using the least amount of moves possible. Here is what a move consists of: ...
6
votes
2answers
284 views

Swap — A Puzzle I Created

This puzzle is called Swap. Let's find out why! Suppose you are given a random $\rm N\times N$ matrix (grid) with all the integers from $1$ to $\rm N^2$ each belonging in every grid square (a.k.a. ...
11
votes
3answers
478 views

Intersection Puzzle

I have invented a new puzzle called Intersection. Let's find out what it is! Intersection You are given an $n\times n$ grid with circles and boxes inside arbitrary squares. A circle cannot be in the ...
8
votes
2answers
261 views

Masyu puzzles with many circles

The rules of Masyu: 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 cell ...
3
votes
1answer
333 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 ...
5
votes
1answer
185 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 $\{C,M,N,P,R,T\}$ ...
9
votes
2answers
729 views

How will you save Mike?

A direct hint: this question. Question starts from here: You are Dr. Nathaniel - a renowned archaeologist, and involved in a research about an ancient site. But, there is only one problem - the ...
3
votes
1answer
203 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 ...
11
votes
1answer
526 views

Distance Puzzle

The rules are: 1. Draw two circles (O) in the empty cells in every row and column. 2. The numbers in the black cells indicate the space between the 2 circles in the black cells' row or column, in ...
5
votes
1answer
260 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, ...
0
votes
1answer
101 views

Slitherlink failure - help needed

I have player "slitherlink" (or "Loopy" as it is sometimes called) generally on a 20x25 grid, so I don't finish too quickly. However I have come across a puzzle (seed was not recorded), that MUST be ...
5
votes
4answers
916 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?...
2
votes
2answers
71 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
166 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 ...
5
votes
1answer
107 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 ...
5
votes
2answers
244 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 ...
12
votes
2answers
332 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 "...
5
votes
2answers
657 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 ...
3
votes
1answer
235 views

An unknown Cryptogram

I would like to say : vyycd gow mcgr uuey
0
votes
1answer
96 views

Heyawake - how to continue?

Can you help me find the next move. (The cells marked with dots must be white).
15
votes
1answer
323 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 ...
2
votes
1answer
94 views

Heyawake - help continue puzzle (2)

Hint needed. The cells marked with dots must be white.
1
vote
1answer
78 views

Heyawake - help continue puzzle

This is my first try on Heyawake and I am stuck. Can you give a hint for the next move. The cells marked with dots must be white.
7
votes
2answers
188 views

Which number goes in the square with the question mark?

My friend, who loves puzzles as much as me, gave me this image this afternoon. My friend game me a hint: Skyscraper, which, as Daniel Mathias pointed out in the comments, is a type of grid puzzle.
5
votes
3answers
224 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. ...
17
votes
1answer
266 views

Diabolical Deceptions: A 333rd Birthday Tribute to J.S. Bach

Johann Sebastian Bach is one of the most famous composers from the Baroque period. If he was still alive today, he’d be 333 years old. So, let’s celebrate 3 of his most famous works with a 33x33 loop ...
6
votes
1answer
190 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 ...
10
votes
4answers
736 views

A new 4 x 4 arrow puzzle

Can anyone help me with solving this puzzle: Draw arrows in all fields around the diagram in a way that every arrow is pointing at least one number inside. The numbers inside the boxes equal the ...
0
votes
1answer
117 views

Another hard level of the game „Flow Mania”

Can you, please, help me to solve this level?
4
votes
1answer
290 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.
5
votes
2answers
199 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
votes
1answer
281 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 ...
1
vote
2answers
136 views

5 subjects and their marks

The following partially-filled table shows the marks scored by 5 students named A, B, C, D and E in five different subjects, namely P, C, M, B and S. The marks scored by all students in all subjects ...
7
votes
1answer
166 views

Color Star (Semi - Instructionless Sum - Star)

Color Star - a semi-instructionless variation of Sum Star Known Rules of Sum Star Fill cells with numbers and shade all remaining cells such that Each dodecagon contains the numbers 1-9 exactly ...
-5
votes
1answer
158 views

Statue Park (Loop)

Place each of the twelve pentominoes into the grid once, with rotations and reflections allowed. No two pentominoes can overlap or be orthogonally adjacent, and all cells not occupied by the ...
8
votes
4answers
376 views

A “Find the Path” Puzzle

I invented a puzzle, inspired by Simon Tatham's Portable Puzzle Collection. Is there anything that it could improve on? Was it too easy, or was it too hard? Anything I could add? What must I call it? ...