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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1answer
14 views

Where to pitch the next tent?

I am stuck solving this "Trees and Tents" puzzle. How to sovle the rest of the puzzle? For does who don't know the puzzle, these are the "Trees and Tents" rules: A tent must be placed next to every ...
3
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1answer
176 views

Another puzzle for who has long boring days

The rules: each row must have the digits from 0 to 9. The sum of the digits in the column is shown at the bottom of the column. The same number can appear more than once in a column. Adjacent boxes ...
9
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1answer
226 views

New puzzle for who has long boring days

This is a Sujiken puzzle ...
4
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2answers
161 views
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0answers
113 views

Need help for a sto-stone puzzle [closed]

I need help for this puzzle. The name is Sto-Stone, a friend sent me for geocaching.
11
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1answer
271 views

humans, vampires and mirrors

Here is a room composed of $10 \times 10$ squared cells. Some cells contain a double-faced mirror ( / or \ ) that reflects the light with an angle of $90°$ on both sides. The other cells can be empty (...
12
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2answers
294 views

The entrapment of Beastly Gerbil

Part 1: The disappearance of Beastly Gerbil I've been trapped here for what feels like forever. This is all I've known. Darkness. The occasional flash of light, but then back to darkness, always, ...
7
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2answers
347 views

Akari: Another Light

Rules (taken from Nikoli): Place light bulbs (circles) according to the following rules. Light bulbs may be placed in any of the white squares, the number in the square shows how many light ...
8
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0answers
257 views

Mosaic by Albrecht Dürer

This is a visual puzzle (known as "mosaic" or "fill-a-pix") with the same rules as MineSweeper: The grid is to be filled with colored and white tessera. Choose whatever color you like for the colored ...
12
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2answers
247 views

Let's Play Tetris!

Fill the whole grid with Tetrominos. Every cell must be part of exactly one Tetromino. Tetrominos can be rotated as necessary. The colored clue cells must be part of the indicated type of ...
8
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1answer
228 views

Nurikabe minicubes: the Boondoggle, the Lollygag, the Dillydally

These are three-dimensional Nurikabe puzzles. In each case, the four squares represent the layers of a $4\times4\times4$ cube. The goal is to shade some cells in each layer so that the resulting space ...
8
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2answers
155 views

I know I should solve this Masyu… But… How should I make this puzzle more colorful?

I know I should solve this Nurikabe variant... I know I should shade all Masyu circles... I know I should not let $2 \times 2$ unshaded squares appeared... I know I should solve this Masyu... ...
18
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2answers
527 views

A colorful metapuzzle (of a sort)

edit: realized two puzzles ended up being variants. Replaced subpuzzle 5 completely, and swapped subpuzzle 2 to the original version. Either version has the same solution. edit 2: my apologies. this ...
31
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1answer
3k views

MASTERING Sudoku

Fill the grid with letters M, A, S, T, E, R, I, N and G. Standard Sudoku rules apply. Additionally, the words on the right-hand side must appear in the given orientation (across/down). Each word ...
7
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1answer
112 views

A Grid with some Green Cells

So a friend wanted me to try out the reverse-puzzling riddle he created. It consisted of a 4x4 grid with a digit in each cell and a single closed loop drawn along the edges of its cells. Also some of ...
9
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1answer
219 views

Akari: The Light

Rules (taken from Nikoli): Place light bulbs (circles) according to the following rules. Light bulbs may be placed in any of the white squares, the number in the square shows how many light ...
4
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1answer
110 views

Hamiltonian Puzzle Algorithm

I know how to create a Hamiltonian path or circuit for a given grid size (in which all nodes are free). However I just wonder how to create specific type of puzzles like the ones given below. I'm ...
11
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3answers
726 views

Puzzle needs a name

Inspired by @Stiv's This new puzzle type needs a name series, what is the name of the puzzle below? Start by solving the (quite tough) Nonogram, then apply some grid-deduction-deduction and discover ...
12
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1answer
230 views

News of the world

Here's a quick little puzzle to keep busy.
23
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2answers
564 views

The disappearance of Beastly Gerbil

Part 2: The entrapment of Beastly Gerbil This is an unusual call in. As a private detective you have been asked to investigate several odd cases, but this you're still convinced this one is taking ...
3
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0answers
93 views

Splitting a Grid in 4 Equal Portions [closed]

I was wondering if someone could provide a solution to this. Instructions are provided. Thank you.
21
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1answer
1k views

This new puzzle type needs a name {6}

I believe I have invented** a new type of puzzle... What is its name? Begin by solving the Fillomino puzzle: Rules of Fillomino (taken from Nikoli) Fill in all empty cells with numbers ...
6
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1answer
161 views

Pandiagonal Magic Takuzu

Here's a puzzle type I call Pandiagonal Magic Takuzu. It's inspired by @Stiv's series "This new puzzle type needs a name", except you get the name up front. Can you solve it?
2
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1answer
133 views

Optimal number of moves in “magnetism” puzzle? [duplicate]

Once, I saw a puzzle on Puzzlopia (now a Chinese website, just put a .com in the bold text). I call this "Magnetism", where the board and rules are: Board: (recreation) Rules: 1) ...
14
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3answers
1k views

A King's Hamiltonian Tours

a) Place the numbers 1 to 25 in the cells of a 5 x 5 board in such a way that consecutive numbers occur in adjacent cells either vertically, horizontally, or diagonally, and so do cells with numbers 1 ...
14
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2answers
586 views

This new puzzle type needs a name {5}

I believe I have invented a new type of puzzle... What is its name? Colour-blind-friendly version available here. Begin by solving the 9x9 sudoku; each of the 9 symbols ...
5
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1answer
176 views

Just Another Sudoku for PSE

Crafted with love for PSE, <3
10
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1answer
255 views

Double Chocolate: Happy Valentine's Day!

Hikouki (@flight_float) over on Twitter issued a challenge to make a Double Chocolate logic puzzle with a fixed grid pattern, and lots of logic puzzle makers responded to that challenge! Here's my ...
17
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1answer
733 views

On The Subject of Battleships

(This is part of a series of puzzles written for Timwi for a Secret Santa puzzle exchange, themed around various custom modules for the game Keep Talking and Nobody Explodes. No KTaNE knowledge is ...
12
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1answer
806 views

This new puzzle type needs a name {4}

I believe I have invented a new type of puzzle... What is its name? Begin by solving the 16x16 sudoku; each of the digits 1-16 must appear exactly once in each row, column and thick-bordered 4x4 ...
18
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2answers
2k views

This Nonogram seems a bit… off

Hmm...... Did I miss something? The hidden word has six unique letters anyway...... Hint 1: Hint 2: Hint 3: Addendum: There is a (very) minor fix to ensure the puzzle "uniquely solvable", adding 1-...
17
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2answers
613 views

Another Rook's Tour

Place numbers 1 to 100 in the cells of this 10 x 10 board in such a way that consecutive numbers, and also numbers 1 and 100, occupy neighboring cells (either vertically or horizontally). Prime ...
13
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1answer
463 views

On The Subject of X-Rays

(This is part of a series of puzzles written for Timwi for a Secret Santa puzzle exchange, themed around various custom modules for the game Keep Talking and Nobody Explodes. No KTaNE knowledge is ...
19
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3answers
3k views

A rook's tour of the chessboard

Place numbers 1 to 64 in the cells of this 8 x 8 board in such a way that consecutive numbers, and also numbers 1 and 64, occupy neighboring cells (either vertically or horizontally). Shaded cells ...
10
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1answer
127 views

3D Slitherlink (Slithersurface)

Here is a 5 x 5 x 5 cube filled with numbers. It's a 3D adaption of standard slitherlink puzzles. You must create a solid 3D object such that the number in each sub-cube matches the number of adjacent ...
18
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1answer
384 views

Prime number snake (2)

This question is inspired by prime number snake. In the following grid, you have to place a number snake of numbers 1 to 100. Consecutive numbers have to go into neighboring cells. Numbers in grey ...
45
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5answers
4k views

Prime Number Snake

Place numbers 1 to 100 in the cells of the 10 x 10 board below in such a way that consecutive numbers occupy neighboring cells (either horizontally or vertically). Shaded cells should contain only ...
2
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1answer
190 views

Their mistake or mine?

I've found Pepper's Puzzles to be a very nice introduction to picross puzzles, with a cute anime girl to boot. While I've steadily improved in my deductive powers and the logic inherent to nonograms, ...
27
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1answer
1k views

This new puzzle type needs a name {3}

I believe I have invented** a new type of puzzle... What is its name? ** Well, 'adapted' an existing one, really... Colour-blind-friendly version available here. Those without colour-blindness ...
12
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2answers
528 views

Compoundoku wants BIG

Rules of Compoundoku: Solve both left and right Sudokus. In addition, the board below them is the Compound Board of both Sudokus. Each number on the Compound Board should tell either: (1) ...
23
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2answers
1k views

Introducing: Compoundoku!

Rules of Compoundoku: Solve both left and right Sudokus. In addition, the board below them is the Compound Board of both Sudokus. Each number on the Compound Board should tell either: (1) ...
2
votes
1answer
301 views

What is the smallest number of lies needed to solve a Dragon Joust puzzle?

I recently watched this video which presents a deduction "riddle" about dragon jousting. The rules for the puzzle (from the video) are as follows: After centuries of war, the world’s kingdoms have ...
11
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1answer
423 views

Latin-Square Adjacent Puzzles

Here are two $5 \times 5$ Latin-Square Adjacent puzzles. For each cell, put a digit between $1$ and $5$ such that: Each row and column contains one occurrence of each digit $1$ to $5$. If two cells ...
24
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4answers
1k views

Another new puzzle type needs a name

For an example of how this type of puzzle works, see here... I believe I have invented another new type of puzzle... What is its name? Colour-blind-friendly version available here. Begin by ...
3
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4answers
387 views

Help with a sudoku puzzle

I would really appreciate some help because I spent more than hours finding another number. It is supposed to be a very hard one but I started well and according to the key, my numbers are correct. Do ...
8
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1answer
218 views

Captain Pun's favourite animals

My good friend Captain Pun's party was a truly excellent event. His new boat - the venue - was a beautiful thing to behold, decorated throughout with nonograms in frames (as anybody who knows him ...
5
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1answer
149 views

All That Remains Sudoku

. 2 . | . 7 . | . . 9 . 9 8 | . . . | . . . 3 . . | 9 . . | . . . ---------+---------+-------- 2 . 7 | . . . | . . . . 1 5 | 7 . . | . . . . . . | 1 5 8 | . ...
8
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1answer
238 views

Whirlwind of the Square Sudoku Table

. . . | . . . | . . . 6 . . | . . 1 | . 2 . . . . | . . . | . . . ---------+---------+-------- . . 7 | . . . | . . . . . . | . . . | . . . . . . | . . . | . ...
77
votes
2answers
5k views

This new puzzle type needs a name

I believe I have invented a new type of puzzle... What is its name? Colour-blind-friendly version available here. Begin by solving the 16x16 sudoku; each of the digits 1-16 must appear exactly ...
7
votes
2answers
471 views

Pensive Nonogram - Two-Colour Puzzle

Fourth two-colour puzzle in the 32nd issue of Mega Pixel Puzzles by Puzzler.. I’ve made some progress, but I am stuck. Can you help me find my next move in it? (The puzzle is below)

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