(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
To get the numbers 19, 20, and 21 to work in an Advent puzzle, Philip has expanded this grid to 10×10 size and a lot of 0, 1, 2, and 9 values are given. Can you solve this extra large challenge?

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or solve online (using SudokuPad)

Theme: Short Day, Long Puzzle

Author/Opus: This is the 69th puzzle from Philip Newman, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Variation of Sudoku rules (insert a number from 0 to 9 into each cell so that no number repeats in any row, column, or bold region). If a white circle is given between two adjacent cells, then the two numbers in those cells must differ by 1. If a black circle is given between two adjacent cells, then the two numbers must have a ratio of 2. Pairs of cells without circles can have any relationship.

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 10:00; One party hat (🥳): 25:00. All other solvers earn a 🦕: Archaic Amphisaurus.

Thomas Hits the GAS (highlight to view): 6:22, with SudokuPad replay file shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).

Solution: PDF and solving video with explanation from GAS team.

Note: Follow this link for other less common variations of Sudoku.

Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Daily GAS discussion post on the GMPuzzles Discord. Not a member of the Discord? Click this link for basic access.

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
This puzzle combines some connected Renban sets with some Killer cages for another two-variant experience from clover!.

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or solve online (using SudokuPad)

Theme: Pinwheel

Author/Opus: This is the 87th puzzle from Clover, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Standard Sudoku rules (insert a number from 1 to 9 into each cell so that no number repeats in any row, column, or bold region). Numbers along each line must form a non-repeating consecutive set, in any order. (For example, a 4-cell Renban line could be 4352, but not 5679 or 2312.) Also, the sum of the numbers in each cage must equal the value given in the upper-left corner of that cage. Numbers cannot repeat inside a cage.

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 6:30; One party hat (🥳): 12:00. All other solvers earn a 🦕: spinning Sahaliyania.

Thomas Hits the GAS (highlight to view): 2:08, with SudokuPad replay file shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).

Solution: PDF and solving video with explanation from GAS team.

Note: Follow this link for other less common variations of Sudoku.

Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Daily GAS discussion post on the GMPuzzles Discord. Not a member of the Discord? Click this link for basic access.

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
This Star shape with six regions made out of nine triangles forms a fun geometric variation for today’s GAS.

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or solve online (using SudokuPad)

Author/Opus: This is the 65th puzzle from Bill Murphy, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Insert a number from 1 to 9 into each cell so that no number repeats in any bold region or row (including the two directions of diagonal rows). Rows extend across the empty center of this diagram when considering the no-repeat rule.

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 6:30; One party hat (🥳): 12:00. All other solvers earn a 🦕: Hexagonal Hesperosaurus.

Thomas Hits the GAS (highlight to view): 1:17, with Penpa Plus replay this time.

Solution: PDF and solving video with explanation from GAS team.

Note: Follow this link for other less common variations of Sudoku.

Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Daily GAS discussion post on the GMPuzzles Discord. Not a member of the Discord? Click this link for basic access.

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
Clover! is back with another two variant puzzle, this time merging XV Pairs and Quadruples thinking in one connected experience.

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or solve online (using SudokuPad)

Theme: XV and IVs

Author/Opus: This is the 86th puzzle from Clover, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Standard Arrow Sudoku rules: Insert a number from 1 to 9 into each cell so that no number repeats in any row, column, or bold region). Whenever an X or V, reflecting the Roman numerals for 10 or 5, is placed on the edge between cells, the numbers in the two adjacent cells must sum to exactly 10 or 5. (Pairs of cells without an X or V mark can have any sum value.) Also, numbers in white circles must appear in at least one of the four surrounding cells.

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 6:30; One party hat (🥳): 12:00. All other solvers earn a 🦕: Roman Rhabdodon.

Thomas Hits the GAS (highlight to view): 2:33, with SudokuPad replay file shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).

Solution: PDF and solving video with explanation from GAS team.

Note: Follow this link for other less common variations of Sudoku.

Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Daily GAS discussion post on the GMPuzzles Discord. Not a member of the Discord? Click this link for basic access.

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
Three more numbers (13, 14, 15) are here in this Advent Calendar edition of XV Pairs Sudoku.

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or solve online (using SudokuPad)

Author/Opus: This is the 67th puzzle from Philip Newman, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Standard Sudoku rules (insert a number from 1 to 9 into each cell so that no number repeats in any row, column, or bold region). Whenever an X or V, reflecting the Roman numerals for 10 or 5, is placed on the edge between cells, the numbers in the two adjacent cells must sum to exactly 10 or 5. (Pairs of cells without an X or V mark can have any sum value. Also, the cages surrounding some givens are just showing part of the visual theme and have no other meaning.)

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 8:00; One party hat (🥳): 15:00. All other solvers earn a 🦕: Dawdling Domeykosaurus.

Thomas Hits the GAS (highlight to view): 4:09, with SudokuPad replay file shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).

Solution: PDF and solving video with explanation from GAS team.

Note: Follow this link for other less common variations of Sudoku.

Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Daily GAS discussion post on the GMPuzzles Discord. Not a member of the Discord? Click this link for basic access.

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
The short palindrome sequences in this puzzle lead to some amazing deductions. Can you figure this GAS puzzle out?

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or solve online (using SudokuPad)

Theme: Spike Island

Author/Opus: This is the 64th puzzle from Bill Murphy, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Standard Sudoku rules (insert a number from 1 to 9 into each cell so that no number repeats in any row, column, or bold region). The numbers along each gray line form a palindrome (i.e., read the same forwards and backwards).

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 6:30; One party hat (🥳): 12:00. All other solvers earn a 🦕: Engaged Euhelopus.

Thomas Hits the GAS (highlight to view): 2:28, with SudokuPad replay file shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).

Solution: PDF and solving video with explanation from GAS team.

Note: Follow this link for other less common variations of Sudoku.

Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Daily GAS discussion post on the GMPuzzles Discord. Not a member of the Discord? Click this link for basic access.

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
This puzzle adds four more regions and that must make it extra hardcore (or at least really special for GAS).

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or solve online (using SudokuPad)

Author/Opus: This is the 63rd puzzle from Bill Murphy, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Insert a number from 1 to 9 into each cell so that no number repeats in any row, column, or bold region. The shaded regions must also contain 1 to 9 without repeats.

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 7:00; One party hat (🥳): 13:00. All other solvers earn a 🦕: December Dystrophaeus.

Thomas Hits the GAS (highlight to view): 2:27, with SudokuPad replay file shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).

Solution: PDF and solving video with explanation from GAS team.

Note: Follow this link for other less common variations of Sudoku.

Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Daily GAS discussion post on the GMPuzzles Discord. Not a member of the Discord? Click this link for basic access.

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
Today’s GAS features the full Battenburg dessert: the checkerboard clues show where an alternating even/odd pattern must appear and the absence of such clues indicates there is no such “pretty” pattern in that space.

PDF

or solve online (using SudokuPad)

Theme: Accentuate the Negative

Author/Opus: This is the 84th puzzle from Clover, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Standard Sudoku rules (insert a number from 1 to 9 into each cell so that no number repeats in any row, column, or bold region). Whenever a checkerboard clue appears at the intersection of four cells, the numbers in those cells must form a “checkerboard” pattern of odd and even (i.e., one diagonally opposite pair is odd and the other pair is even). All possible checkerboard clues have been given, so any sets of four cells without a clue cannot have a “checkerboard” pattern of odd and even.

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 8:00; One party hat (🥳): 15:00. All other solvers earn a 🦕: negative Neovenator.

Thomas Hits the GAS (highlight to view): 2:54, with SudokuPad replay file shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).

Solution: PDF and solving video with explanation from GAS team.

Note: Follow this link for other less common variations of Sudoku.

Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Daily GAS discussion post on the GMPuzzles Discord. Not a member of the Discord? Click this link for basic access.

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
An advent calendar helps us count consecutive days until Christmas, like the 789 here in Philip’s GAS for today.

PDF

or solve online (using SudokuPad)

Theme: Eight Nine, Seven Did

Author/Opus: This is the 65th puzzle from Philip Newman, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Standard Sudoku rules (insert a number from 1 to 9 into each cell so that no number repeats in any row, column, or bold region). Numbers along each line must form a non-repeating consecutive set, in any order. (For example, a 4-cell Renban line could be 4352, but not 5679 or 2312. Also, the cages surrounding some givens are just showing part of the visual theme and have no other meaning.)

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 7:00; One party hat (🥳): 13:00. All other solvers earn a 🦕: Sleepy Sauropodiform.

Thomas Hits the GAS (highlight to view): 2:56, with SudokuPad replay file shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).

Solution: PDF and solving video with explanation from GAS team.

Note: Follow this link for other less common variations of Sudoku.

Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Daily GAS discussion post on the GMPuzzles Discord. Not a member of the Discord? Click this link for basic access.

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
This puzzle might be just average — if you look at the numbers in the circled cells at least. Each arrow describes the average value along its length.

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or solve online (using SudokuPad)

Author/Opus: This is the 62nd puzzle from Bill Murphy, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Standard Sudoku rules (insert a number from 1 to 9 into each cell so that no number repeats in any row, column, or bold region). Some arrow shapes are in the grid; the number in the circled cell is equal to the average of all numbers along the arrow. (For example, as R2C3 = 2, the average of R2C4 and R2C5 is 2.)

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 6:30; One party hat (🥳): 12:00. All other solvers earn a 🦕: Uniformed Unescoceratops.

Thomas Hits the GAS (highlight to view): 2:08, with SudokuPad replay file shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).

Solution: PDF and solving video with explanation from GAS team.

Note: Follow this link for other less common variations of Sudoku.

Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Daily GAS discussion post on the GMPuzzles Discord. Not a member of the Discord? Click this link for basic access.