(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
Don’t leave anything to chance; it will take more than a roll of the dice to make the numbers add up in this Region Sum Lines Sudoku.

PDF

or solve online (using SudokuPad)

Theme: 2D6

Also enjoy a bonus 4×4 Region Sum Lines puzzle “Nessie” created by Philip at SudokuCon a couple weeks ago (note: this is not GAS relative to its size!): PDF or solve online (using SudokuPad)

Author/Opus: This is the 145th 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). Along each line, the numbers in every region it passes through have the same sum.

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

Thomas Hits the GAS (highlight to view): 2:55, 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 bonus; solving video with explanation to be added later 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 regions in this Surplus Sudoku are breaking out with repeated digits. No treatments exist yet for this illness, so it must simply run its course. Can you determine where the pesky duplicates will pop up?

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or solve online (using SudokuPad)

Theme: Hyperdigitosis

Author/Opus: This is the 144th puzzle from Philip Newman, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Standard Surplus Sudoku rules, with numbers from 1-7: Insert a number from 1 to 7 into each cell so that no number repeats in any row or column. Some regions appear with more cells than there are numbers in the indicated range. Some number(s) repeat in these regions, but all numbers in the indicated range must appear at least once within each of these regions.

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 9:00; One party hat (🥳): 20:00. All other solvers earn an 🦕: Irish Iuticosaurus.

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

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 Deficit Sudoku puzzle suffers from number deficiency anemia and needs a numeral infusion — stat!

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or solve online (using SudokuPad)

Theme: Anemia

Author/Opus: This is the 143rd puzzle from Philip Newman, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Standard Deficit Sudoku rules, with numbers from 1-7: Insert a number from 1 to 7 into each cell so that no number repeats in any row or column. Some regions appear with fewer cells than there are numbers in the indicated range. No number repeats in these regions, but not all numbers will appear in each of these regions.

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 5:00; One party hat (🥳): 11:00. All other solvers earn a 🦕: Hippopotamic Hypselosaurus.

Thomas Hits the GAS (highlight to view): 1:35, 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

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.)
Will your Fortress Sudoku solving stand, or will it be swept away like a kid’s seaside palace?

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or solve online (using SudokuPad)

Theme: Sandcastles in the Sand

Author/Opus: This is the 142nd 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). A number in a gray cell must be larger than any number in an adjacent white cell that shares an edge. (To assist solvers, this is shown like a greater than/less than shape in how the gray cells are drawn.)

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 9:00; One party hat (🥳): 20:00. All other solvers earn a 🦕: Gauche Garumbatitan.

Thomas Hits the GAS (highlight to view): 4:02, 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

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.)
Live, from SudokuCon 2026, it’s a Slow Thermo!

PDF

or solve online (using SudokuPad)

Also enjoy a bonus earlier version of this puzzle that is more difficult: PDF

or solve bonus online (using SudokuPad)

Theme: SudokuCon ’26

Author/Opus: This is the 141st 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). Some thermometer shapes are in the grid; numbers must either increase or stay the same in each cell going from the round bulb to the flat end. (For instance, a thermometer might contain the sequence 233577888 in that order.)

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

Thomas Hits the GAS (highlight to view): 2:06, with SudokuPad replay file and 3:42 for bonus with replay as well; shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).

Solution: PDF and for bonus; solving video with explanation to be added later 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.)
Philip’s wife: 🎵 Math-y birthday Sudoku! Math-y birthday Sudoku! 🎵 This X-Sums Sudoku quite literally has Philip’s numbers written all over it. Happy 44th, love!

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or solve online (using SudokuPad)

Theme: Birthday Maths

Author/Opus: This is the 140th 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). Also, the clues outside the grid indicate the sum of the first X numbers placed in the corresponding direction, where X is equal to the first number placed in that direction (e.g., if R9C2 is 5, then the five numbers in R9C2, R8C2, and on to R5C2 all add up to 26).

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 7:29; One party hat (🥳): 44:44. All other solvers earn an 🦕: English Europatitan.

Thomas Hits the GAS (highlight to view): 3:25, 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; solving video with explanation to be added later 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.)
Much like a boomerang, Kropki Pairs just keeps coming back.

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or solve online (using SudokuPad)

Theme: Boomerang

Author/Opus: This is the 139th 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). 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 (🎩🥳): 7:30; One party hat (🥳): 14:00. All other solvers earn a 🦕: Down-Under Dreadnoughtus.

Thomas Hits the GAS (highlight to view): 4:52, 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; solving video with explanation to be added later 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 Classic Sudoku was set late at night. Better late than later.

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or solve online (using SudokuPad)

Theme: Better Late

Author/Opus: This is the 138th 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).

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 7:30; One party hat (🥳): 14:00. All other solvers earn a 🦕: Casual Campananeyen.

Thomas Hits the GAS (highlight to view): 2:46, 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; solving video with explanation to be added later from GAS team.

Note: Follow this link for other classic Sudoku. If you are new to this puzzle type, here are our easiest Sudoku to get started on. More Sudoku including variations can be found in these books in our e-store. Also, visit this page to purchase all of the puzzles from the 16th World Sudoku Championship including classic 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 Arabic numerals 1 to 9 are each given exactly once, but plenty of Roman 5s and 10s add up to lots of fun in this XV Pairs Sudoku.

PDF

or solve online (using SudokuPad)

Theme: nvmeri, non verba

Author/Opus: This is the 137th 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.)

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

Thomas Hits the GAS (highlight to view): 3:53, 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; solving video with explanation to be added later 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.)
You’ll need to crank your puzzle skills all the way up to solve this Thermo-Sudoku.

PDF

or solve online (using SudokuPad)

Theme: These Go to 11

Author/Opus: This is the 136th puzzle from Philip Newman, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Standard Thermo-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 thermometer shapes are in the grid; numbers must be strictly increasing from the round bulb to the flat end.

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 8:30; One party hat (🥳): 16:00. All other solvers earn an 🦕: Anthropologist Andesaurus.

Thomas Hits the GAS (highlight to view): 4:01, 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; solving video with explanation to be added later from GAS team.

Note: Follow this link for more Thermo-Sudoku puzzles. If you are new to this puzzle type, here are our easiest Thermo-Sudoku to get started on. More Thermo-Sudoku puzzles can be found in these books in our e-store. Also, visit this page to purchase all of the puzzles from the 16th World Sudoku Championship including some Thermo-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.