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.
194 questions
5
votes
1answer
229 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
170 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
267 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
457 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
244 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
320 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
179 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
705 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
186 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
512 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
252 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
97 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
899 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
68 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
148 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
99 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
240 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
322 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
652 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
228 views
0
votes
1answer
93 views
Heyawake - how to continue?
Can you help me find the next move. (The cells marked with dots must be white).
14
votes
1answer
315 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
93 views
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
187 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
208 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. ...
16
votes
1answer
241 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
189 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
721 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
115 views
4
votes
1answer
286 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
193 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
278 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
133 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 ...
6
votes
1answer
157 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
149 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
369 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?
...
2
votes
1answer
103 views
4x4 square mapping to tick
I cannot see any pattern in how the top left box maps to the top right box.
14
votes
1answer
271 views
Finding the hidden path (new grid puzzle concept?)
I was toying around with grid-based puzzles, and I can up with a format that I'm not sure exists yet, and from my testing leaves only one solution. (If it exists or is broken, please let me know so I ...
4
votes
2answers
129 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 ...
17
votes
2answers
348 views
Unusual Kakuro Puzzle
Entry into Fortnightly Topic Challenge #38: Reusing Information 1
This puzzle sort of looks like a kakuro puzzle but there doesn't seem to be any sums. Figure out how this puzzle works and solve the ...
14
votes
1answer
327 views
HAISU with a twist
HAISU is a grid-deduction puzzle designed by this site's very own TheGreatEscaper. To quote them:
HAISU is a portmanteau of three Japanese words - 'hairu', to enter, 'su', number, and 'hausu', an ...
8
votes
1answer
198 views
Unusual Sudoku Puzzle
Find the solution to this Sudoku puzzle. The only problem is there aren't any normal Sudoku clues. Instead there are only some cryptic clues.
What is the solution and how does the puzzle work?
Edit: ...
28
votes
1answer
571 views
Pikurossword, or: Three-in-One
This is an entry into the Fortnightly Topic Challenge #36. [edit: i hope this wasn't too bad for my first puzzle here! let me know how i did :)]
The answer to this puzzle should answer the question: ...
57
votes
3answers
2k views
R.H.P.C. crossword puzzle
This is an entry into the Fortnightly Topic Challenge #36
I got a ticket to the Red Herring Puzzle Club in the middle of the street. There was just a guy giving them out, like some advertisement ...
38
votes
2answers
1k views
Circuit Diagram
An entry to Fortnightly Topic Challenge #35: Restricted Title 1 - based on the following xkcd.
Circuit diagrams can be quite difficult to understand, so here are some documents that will hopefully ...
23
votes
2answers
766 views
Slightly Odd Sudoku
Someone I find very trustworthy continues to insist that this is a valid Sudoku board. It's been a while since I've played, but surely there's a couple of things off here, right?
Alright, so that ...
21
votes
1answer
593 views
Snakes on a Plane! 2
An entry in Fortnightly Topic Challenge #35: Restricted Title 1. Inspired by the title of this xkcd comic.
Snakes ... on a plane ... again ...
This time 2 specimens of a huge unknown type of snakes ...
16
votes
1answer
558 views
Barrel - Part 1
An entry in Fortnightly Topic Challenge #35: Restricted Title 1. Title based on the very first xkcd. Continued in Barrel - Part 2, Barrel - Part 3, Barrel - Part 4, and Barrel - Part 5.
You manage a ...
15
votes
2answers
472 views
Hitchhiker's guide to Scrabble
I was working at My God, it's full of stars! puzzle, when a sudden realisation came into my head: that I have a friend, who is also an astronaut, and that I have an appointment with him! We were ...
