Rey's Puzzles

Difficulties are marked according to the Logic Masters Germany scale. These are just my best guesses, so please let me know if you have a different opinion!

All OctoPuzzles links come with walkthroughs if you need help at any point. (Not all puzzles have OctoPuzzles links.)

KailOVER #

Published on November 7, 2023.

Difficulty: 3

Tags: Sudoku, Region Sum Lines, Circle Counters, Diagonal

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CTC

Penpa

Circular Whispers #

Published on October 22, 2023.

Difficulty: 2

Tags: Sudoku, Circle Counters, German Whispers, Odd/Even

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CTC

Penpa

River #

Published on July 27, 2023.

Difficulty: 2

Tags: Sudoku, Renban, Killer Cages

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CTC

Penpa

Pointer Fillomino #

Published on July 24, 2023.

Difficulty: 4

Tags: Fillomino

Divide the grid into orthogonally connected regions such that no two regions of the same size share an edge. Also place a number in each cell indicating the size of the region it is in.

Arrows indicate that the nearest cell with value n in the indicated direction is n cells away, where n is the digit in the arrow.

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CTC

Penpa

An example puzzle is shown below.

Image of 'Pointer Fillomino' example puzzle

Image of 'Pointer Fillomino' example puzzle solution

Example

Wiring #

Published on July 3, 2023.

Difficulty: 2

Tags: Sudoku, German Whispers, Kropki

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CTC

Penpa

F-Puzzles

Last Stand #

Published on June 17, 2023.

Difficulty: 3

Tags: Sudoku, Thermometers

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CTC

Penpa

F-Puzzles

LMD

Fillomino Chaos Construction 2 #

Published on June 5, 2023.

Difficulty: 5

Tags: Sudoku, Chaos Construction, Fillomino, Sightlines

Divide the grid into 9 orthogonally connected regions of size 9, and place the digits 1-9 in the grid such that each row, column, and region has one copy of each digit.

Then, divide each region into some polyominoes such that no two polyominoes of the same size share an edge.

Digits in a circle indicate the size of the polyomino it is in, and digits in a square indicate the number of polyominoes in its region.

A digit in a clued cell indicates the number of cells seen in the indicated directions combined (including itself). POLYOMINO borders obstruct vision.

Penpa solvers only: Answer check requires all digits to be filled out, green edges for region borders, and double edges for pentomino borders that are NOT region borders. (All region borders are also pentomino borders because of the rules.)

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CTC

Penpa

LMD

WXV #

Published on May 24, 2023.

Difficulty: 2

Tags: Sudoku, Renban, German Whispers, XV

This was a gift for my high school Macroeconomics teacher.

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CTC

F-Puzzles

Mind The Gap #

Published on May 24, 2023.

Difficulty: 3

Tags: Sudoku, X-Sums, Diagonal

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F-Puzzles

OctoPuzzles

Push #

Published on May 24, 2023.

Difficulty: 2

Tags: Sudoku, Killer Cages, Kropki

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F-Puzzles

Fillomino Chaos Construction #

Published on May 22, 2023.

Difficulty: 5

Tags: Sudoku, Chaos Construction, Fillomino

Divide the grid into 9 orthogonally connected regions of size 9, and place the digits 1-9 in the grid such that each row, column, and region has one copy of each digit.

Then, divide each region into some polyominoes such that no two polyominoes of the same size share an edge.

Digits in a circle indicate the size of the polyomino it is in, and digits in a square indicate the number of polyominoes in its region.

Penpa solvers only: Answer check requires all digits to be filled out, green edges for region borders, and double edges for pentomino borders that are NOT region borders. (All region borders are also pentomino borders because of the rules.)

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CTC

Penpa

LMD

Tepper #

Published on May 8, 2023.

Difficulty: 2

Tags: Sudoku, Renban, Arrows

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CTC

Penpa

F-Puzzles

First Burn #

Published on May 3, 2023.

Difficulty: 4

Tags: Suguru, Chaos Deconstruction, German Whispers, Ambiguity, Odd/Even

Suguru: Fill some cells in the grid with the digits 1-9 such that no digit repeats in a row or column. All digits must belong to a region, which is a collection of orthogonally connected cells. A region of size n contains the digits 1 through n once each. Regions may not touch each other orthogonally, although they may touch each other diagonally.

Whisper/Scream Lines Ambiguity: Each line is either a Whisper or a Scream; the solver must determine which. Adjacent digits on a Whisper line differ by 5 or more. Adjacent digits on a Scream line differ by 2 or more, and furthermore, every digit on a Scream must be high (6789).

If two cells along the same Whisper line are not on an orthogonally connected path along the line, then they must not be in the same region. This rule does NOT apply for Scream lines.

All branches of a line are considered the same line.

Odd/Even: Digits in a gray circle are odd. Digits in a gray square are even.

Any cell containing a line, Odd, or Even clue must have a digit in it.

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CTC

Penpa

F-Puzzles

OctoPuzzles

LMD

Silent Suguru #

Published on April 24, 2023.

Difficulty: 5

Tags: Suguru, Chaos Deconstruction, German Whispers, Odd/Even

Suguru: Fill some cells in the grid with the digits 1-9 such that no digit repeats in a row or column. All digits must belong to a region, which is a collection of orthogonally connected cells. A region of size n contains the digits 1 through n once each. Regions may not touch each other orthogonally, although they may touch each other diagonally.

German Whispers: Adjacent digits on a German Whisper line differ by 5 or more.

Two cells along the same German Whisper belong in the same region if and only if they are on an orthogonally connected path along the line.

Odd/Even: Digits in a gray circle are odd. Digits in a gray square are even.

Any cell containing a German Whisper, Odd, or Even clue must have a digit in it.

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CTC

Penpa

F-Puzzles

OctoPuzzles

LMD

Quadrants #

Published on April 22, 2023.

Difficulty: 2

Tags: Sudoku, Arrows, Quads

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CTC

F-Puzzles

6:13 #

Published on April 16, 2023.

Difficulty: 3

Tags: Sudoku, Anti-Knight, Killer Cages

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CTC

Penpa

F-Puzzles

OctoPuzzles

Conjoined #

Published on April 4, 2023.

Difficulty: 2

Tags: Sudoku, Killer Cages

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CTC

Penpa

F-Puzzles

9x9 Skyscraper Thermos #

Published on March 23, 2023.

Difficulty: 4

Tags: Sudoku, Skyscrapers, Thermometers

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CTC

Penpa

LMD

6x6 Skyscraper Thermos #

Published on March 22, 2023.

Difficulty: 2

Tags: Sudoku, Skyscrapers, Thermometers

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CTC

Penpa

Minutia #

Published on March 21, 2023.

Difficulty: 1

Tags: Sudoku, Killer Cages, Diagonal

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CTC

F-Puzzles

Pointy #

Published on March 19, 2023.

Difficulty: 2

Tags: Sudoku, Arrows

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CTC

F-Puzzles

LMD

Wings #

Published on March 18, 2023.

Difficulty: 2

Tags: Sudoku, Killer Cages, Diagonal

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CTC

Penpa

F-Puzzles

LMD

Zoom #

Published on March 13, 2023.

Difficulty: 2

Tags: Sudoku, Renban, Kropki

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CTC

F-Puzzles

Monster Without A Name #

Published on March 11, 2023.

Difficulty: 4

Tags: Sudoku, Chaos Construction, Monster Cages

This puzzle is a chaos construction. Cages indicate the product of each region sum contained in a cage. For instance, if a 4-cell cage contained 1,2 in one region and 3,4 in another region, its total would be (1+2)x(3+4)=80. Cages may be contained in one region, in which case, the total is just the sum of the cells. Digits may not repeat in a cage.

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CTC

Penpa

F-Puzzles

LMD

Cars #

Published on March 5, 2023.

Difficulty: 2

Tags: Sudoku, Killer Cages, Kropki

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CTC

F-Puzzles

Monster Cages #

Published on March 4, 2023.

Difficulty: 2

Tags: Sudoku, Chaos Construction, Monster Cages

This puzzle is a chaos construction. Cages indicate the product of each region sum contained in a cage. For instance, if a 4-cell cage contained 1,2 in one region and 3,4 in another region, its total would be (1+2)x(3+4)=80. Cages may be contained in one region, in which case, the total is just the sum of the cells. Digits may not repeat in a cage.

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CTC

Penpa

F-Puzzles

Intersections #

Published on February 27, 2023.

Difficulty: 2

Tags: Sudoku, X-Sums, Diagonal

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CTC

Penpa

F-Puzzles

Starry Sums #

Published on February 21, 2023.

Difficulty: 2

Tags: Sudoku, Diagonal, Star Battle

Shade a square in each row, column, and region such that each digit 1-9 is shaded once and no two shaded squares touch, not even diagonally. Digits outside the grid indicate the sum of the digits it sees before the shaded square.

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CTC

Penpa

F-Puzzles

OctoPuzzles

LMD

QT #

Published on February 17, 2023.

Difficulty: 1

Tags: Sudoku, Thermometers, Quads

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CTC

F-Puzzles

OctoPuzzles

LMD

X-Lines Sudoku #

Published on February 14, 2023.

Difficulty: 4

Tags: Sudoku, X-Lines, Killer Cages

On an X-Line, if X is on the line then so must 10-X. Digits may repeat on a line, so 1159 would be a valid X-Line.

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CTC

Penpa

F-Puzzles

LMD

Class of '23 #

Published on February 11, 2023.

Difficulty: 3

Tags: Sudoku, Killer Cages

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CTC

Penpa

F-Puzzles

OctoPuzzles

LMD

El Corazón #

Published on February 8, 2023.

Difficulty: 2

Tags: Sudoku, Killer Cages, Thermometers

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CTC

Penpa

F-Puzzles

Stairs #

Published on February 6, 2023.

Difficulty: 2

Tags: Sudoku, Killer Cages, Diagonal

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CTC

Penpa

F-Puzzles

Sandwich Stars #

Published on February 5, 2023.

Difficulty: 1

Tags: Star Battle, Sandwiches

Two stars must be placed in every row and column. No two stars may touch, even diagonally.

Additionally, it must be possible to place some digits in cells without stars that signify the number of adjacent stars (diagonally adjacent cells count) and digits do not repeat in a row or column. Also, clues outside a row or column indicate the sum of the digits between the stars.

Cells with a circle must have a digit in them.

Determining where every digits goes is not part of the puzzle; it merely must be possible to place them. (In other words, the placement of the digits is not necessarily unique; only the placement of the stars must be.)

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Penpa

Latin Stars #

Published on February 4, 2023.

Difficulty: 1

Tags: Star Battle, X-Sums

Two stars must be placed in every row and column. No two stars may touch, even diagonally.

Additionally, it must be possible to place some digits in cells without stars that signify the number of adjacent stars (diagonally adjacent cells count) and digits do not repeat in a row or column.

Also, some digits are given as clues are outside each row and column. The first X squares in a row or column in the direction of a clue, where X is the first digit seen in that row or column (which is not necessarily in the first square of the row or column), must add to the indicated sum. (Any square without a digit does not contribute to the sum.)

Determining where these digits go is not part of the puzzle; it merely must be possible to place them. (In other words, the placement of the digits is not necessarily unique; only the placement of the stars must be.)

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Penpa

Highway #

Published on February 1, 2023.

Difficulty: 2

Tags: Sudoku, Killer Cages, Diagonal

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CTC

Penpa

F-Puzzles

LMD

Genome #

Published on January 31, 2023.

Difficulty: 2

Tags: Sudoku, German Whispers, Renban, Kropki

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CTC

Penpa

F-Puzzles

Star Battle 1 #

Published on January 27, 2023.

Difficulty: 1

Tags: Star Battle

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Penpa

Bird #

Published on January 19, 2023.

Difficulty: 3

Tags: Sudoku, German Whispers, Little Killers, X-Sums

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CTC

Penpa

F-Puzzles

LMD

Kakuro Sudoku #

Published on January 11, 2023.

Difficulty: 2

Tags: Sudoku

Each number in a shaded cell is either the sum of the two digits below or to the right of it (possibly both).

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CTC

Penpa

F-Puzzles

Equations #

Published on January 7, 2023.

Difficulty: 2

Tags: Sudoku, Equations

Digits in cells separated by +, x, and = signs form valid arithmetic operations. (All arithmetic operations involve only one-digit numbers.) Classic sudoku rules apply.

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CTC

Penpa

F-Puzzles

Uzumaki #

Published on January 6, 2023.

Difficulty: 1

Tags: Sudoku, Classic Sudoku

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CTC

Penpa

F-Puzzles

Hooks and Swipes #

Published on January 4, 2023.

Difficulty: 1

Tags: Sudoku, Thermometers

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CTC

Penpa

F-Puzzles

Snowflake #

Published on January 3, 2023.

Difficulty: 1

Tags: Sudoku, Classic Sudoku

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CTC

Penpa

F-Puzzles

Distant Neighbors #

Published on January 2, 2023.

Difficulty: 2

Tags: Sudoku, Dutch Neighbors

Every number must be adjacent to at least one number 4 away from it. For example, 4 must share a side with either a 8 or a 9 (possibly both).

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CTC

Penpa

F-Puzzles

Close Neighbors #

Published on December 31, 2022.

Difficulty: 1

Tags: Sudoku, Consecutive Neighbors, CTC Features

Every number must share a side with at least one other consecutive number. For example, 2 must share a side with either a 1 or a 3 (possibly both).

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CTC

Penpa

F-Puzzles

That's What I Mean #

Published on December 28, 2022.

Difficulty: 2

Tags: Sudoku, Killer Cages, Averaging Cells

Numbers in a blue circle are the arithmetic mean of its orthogonal neighbors.

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CTC

F-Puzzles

7-Eleven #

Published on December 8, 2022.

Difficulty: 3

Tags: Sudoku, Killer Cages

The digits orthogonally adjacent to a 7 must sum to 11.

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CTC

Penpa

F-Puzzles

LMD

5 #

Published on December 3, 2022.

Difficulty: 2

Tags: Sudoku, German Whispers, CTC Features

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CTC

Penpa

F-Puzzles

LMD

Alphabet Soup #

Published on November 4, 2022.

Difficulty: 5

Tags: Sudoku, Thermometers

Each thermo displayed in the right grid must be placed in a unique region on the left grid. Moreover, the position of each thermo must not change with respect to its region (meaning no rotation or translation within the region).

Also note that the answer check will only work when the right side is cleared of digits (though you, of course, may consider yourself finished at the time you place the last digit in the left side of the grid).

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Penpa

LMD

An example puzzle is shown below.

Image of 'Alphabet Soup' example puzzle

Image of 'Alphabet Soup' example puzzle solution

Example

Hint 1
Exactly three 1’s are in the bottom row of their box. (The same holds true for any other digit, any other row, or any other column.)
Hint 2
You need to consider at most how many 1’s and how many 2’s can be in the bottom row in conjunction, according to the thermos. Then you need to ask how many there are, according to sudoku rules. (Use Hint 1 for the latter part!)

X Marks the Spot #

Published on October 28, 2022.

Difficulty: 3

Tags: Sudoku, Thermometers, Arrows

Image of 'X Marks the Spot' puzzle

CTC

Penpa

F-Puzzles

LMD