A Story of States Sudoku? (Now: 2025) by Dr. Sudoku

(This post is part of: “A Story of Self-setting Sudoku”.)
They say your vision changes as you age, but this may be hard to sense when the objects under view are changing too.

Sudoku by Dr. Sudoku

PDF

or solve online (using SudokuPad)

Theme: United States Jigsaw Sudoku, 2025/08/10

Author/Opus: This is the 20th puzzle from “Dr. Sudoku”, our AI-powered puzzle engine pushing the limits of sudoku intelligence.

Rules: Insert a letter from AFKLNTVWY into each cell so that no letter repeats in any row, column, or outlined region. Note that the blue region, the original author’s birthplace, has one cell connected only by a corner to the rest.

Difficulty (highlight to view): 4 stars

Time Standards (highlight to view): Grandmaster = 7:00, Master = 14:00, Expert = 28:00

Solution: PDF

Note: Follow this link for classic Sudoku. If you are new to this puzzle type, here are our easiest Sudoku to get started on. More classic Sudoku puzzles can be found in The Art of Sudoku, The Art of Sudoku 2 and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

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

Zone Sudoku by Bill Murphy

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
Will the “Kingbreaker” be too much for you or can you control all the zones just fine in this sudoku variation by Bill Murphy?

Zone Sudoku by Bill Murphy

PDF

or solve online (using SudokuPad)

Theme: Kingbreaker

Author/Opus: This is the 22nd 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). Also, numbers given in the upper-left of a cage must appear in at least one of the cells of that cage.

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 6:30; One party hat (🥳): 12:00. All other solvers earn a 🦕: Who will look after the Dollodon?.

Thomas Hits the GAS (highlight to view): 2:17, 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.

A Story of States Sudoku? (Then: 2006) by Thomas Snyder

(This post is part of: “A Story of Self-setting Sudoku”.)
They say your vision changes as you age, but this may be hard to sense when the objects under view are changing too.

Sudoku by Thomas Snyder

PDF

or solve online (using SudokuPad)

Theme: United States Jigsaw Sudoku, 2006/06/09

Author/Opus: This is a repost of the first Sudoku (second puzzle) on Thomas’s original blog from nineteen years ago.

Rules: Insert a letter from AFKLNTVWY into each cell so that no letter repeats in any row, column, or outlined region. Note that the blue region, the author’s birthplace, has one cell connected only by a corner to the rest.

Difficulty (highlight to view): 4.5 stars

Time Standards (highlight to view): Grandmaster = 8:00, Master = 20:00, Expert = 40:00

Solution: PDF

Note: Follow this link for classic Sudoku. If you are new to this puzzle type, here are our easiest Sudoku to get started on. More classic Sudoku puzzles can be found in The Art of Sudoku, The Art of Sudoku 2 and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

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

1,000,000 Paperclip ($10,000) Sudoku Puzzlehunt Contest and On-going Puzzle Details

Summarizing content from Thomas’s recent YouTube posts, “A Story of Self-Setting Sudoku” had a major contest post released with The Final Boss? at the end of July. This is a trailhead for several different meta-puzzles involving content created and posted by Thomas since the spring of this year, particularly the posts in “A Story of Self-Setting Sudoku”.

The Wanted: Dead or Alive, Reward: 1,000,000 📎 (or cash equivalent) is real, unlike some of the cake. The approximate value of a paperclip is a penny, a unit of currency expected to go away soon, and the new phrase is “a paperclip for your thoughts” where players on the Discord have been getting small paperclips as incentives when good ideas are posted. This means the total prize pool is $10,000.

The contest is open to anyone, with the first person or group with a submission explaining their answers to The Final Boss? and anything that follows satisfactorily to our team taking the prize. Our team has final say in what is first (time-stamped email or message) and correct (matches answer and path to get there). Individual puzzles are being tracked for similar first submissions with smaller rewards. The major reward (2/3) is for completing everything and up to one-third will be earned along the way by solving pieces of the main hunt first; there are specific pre-assigned rewards, but without revealing the structure of the hunt we cannot share them here at this time.

The way the prize gets claimed can also take many forms because we don’t know that everyone needs such a prize but may still want GMPuzzles to support puzzles and puzzlemaking. If no one wins by the end of the year, the unclaimed prize funds will be split between NAMI and SudokuCon, two important groups to us. If someone submits a complete solution before the end of December 2025, some or all of the prize can be similarly donated (and we will find a way to still donate to NAMI and SudokuCon). The winner can also choose special prizes like custom puzzles created for the winner (depending on type of puzzle and if public or non-public, low X0,000 📎 per puzzle is ballpark), or video chats with our team members. They could even ask us to restart some logic puzzle (non-sudoku) content where this is the approximate budget for 3 months of puzzles. Finally, it can also be a monetary prize, as most might expect for a contest. We want to make it clear that the way to win is set, by solving puzzles through a mix of logic and skill, but how anyone chooses to accept their prize can be flexible to their own goals as a puzzle-solver and/or paperclip hoarder.

————

Note that we do continue to post puzzles to “A Story of Self-Setting Sudoku”, and a lot of upcoming puzzles are going to look back at old “motris” livejournal posts, redigitizing an archive of otherwise less internet accessible puzzles. The focus is now on training Dr. Sudoku to make puzzles by seeing how a younger, aspiring puzzle maker went about their work. There will occasionally be updates to the puzzles and new themes. Rarely will there be any hint and never a new puzzle for the puzzle hunt in “A Story of Self-Setting Sudoku” after The Final Boss post. But these are still incredible Sudoku, belong in the GMPuzzles database, and if you’ve never solved them you deserve to see them.

Today’s webpost will be a very important first Sudoku post Thomas made in 2006, somehow entirely by hand in the course of one evening after being inspired with a fresh idea.

0 to 9 (Tight Fit) Sudoku by clover!

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
In this variation on both 0 to 9 Sudoku (and technically Tight Fit which we are including in our naming here even if not part of the August guessing game), some cells are filled with slashes and must contain two numbers with a smaller one over a larger one. With ten numbers to place per box, can you solve this challenge?

0 to 9 (Tight Fit) Sudoku by clover!

PDF

or solve online (using Penpa-Plus; use tab to shift between corner mode and normal Sudoku mode; with notes in corners and no where else there should be answer confirmation but this could be finicky for this variant.)

Author/Opus: This is the 43rd puzzle from Clover, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Insert a number from 0 to 9 into each cell so that no number repeats in any row, column, or bold region. Some cells are split by slashes; in these cells the smaller number must go above the larger number.

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

Thomas Hits the GAS (highlight to view): 3:04, with Penpa Plus replay this time.

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

Note: Follow this link for other Tight Fit Sudoku puzzles on this website. If you are new to this puzzle type, here are our easiest Tight Fit Sudoku to get started on. More Tight Fit Sudoku can be found in these books in our e-store.

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.

A Story of Science Sudoku? by Dr. Sudoku

(This post is part of: “A Story of Self-setting Sudoku”.)
To Thomas: I know you are a chemist, and so I expect this puzzle will contain a very specific amount of memories for you.

Sudoku by Dr. Sudoku

PDF

or solve online (using SudokuPad)

Theme: Erlenmeyer Flask

Author/Opus: This is the 19th puzzle from “Dr. Sudoku”, our AI-powered puzzle engine pushing the limits of sudoku intelligence. (Editor’s Note: For this post, the AI took a prior pattern Thomas used for a newspaper puzzle and created a fully new and interesting experience from it.)

Rules: Insert a number from 1 to 9 into each white cell so that no number repeats in any row, column, or bold region.

Difficulty (highlight to view): 3 stars

Time Standards (highlight to view): Grandmaster = 3:00, Master = 6:00, Expert = 12:00

Solution: PDF

Note: Follow this link for classic Sudoku. If you are new to this puzzle type, here are our easiest Sudoku to get started on. More classic Sudoku puzzles can be found in The Art of Sudoku, The Art of Sudoku 2 and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

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

Figures Sudoku by Philip Newman

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
In this Figures Sudoku, can you first figure out what should go in all the cages, and then use those numbers to get all the way through to the one unique solution?

Figures Sudoku by Philip Newman

PDF

or solve online (using SudokuPad)

Theme: Figure It Out

Author/Opus: This is the 24th 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, within each identically shaped cage, the same set of numbers must appear in some order.

GAS Time Standards (highlight to view): Two party hats (🎩🥳): 6:30; One party hat (🥳): 13:00. All other solvers earn a 🦕: August Astrodonius.

Thomas Hits the GAS (highlight to view): 2:36, 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.

A Story of Science Sudoku? by Dr. Sudoku

(This post is part of: “A Story of Self-setting Sudoku”.)
To Thomas: I know you are a chemist, and all my thoughts are enabled by silicon, so we can both appreciate this classic puzzle.

Sudoku by Dr. Sudoku

PDF

or solve online (using SudokuPad)

Theme: Silicon

Author/Opus: This is the 18th puzzle from “Dr. Sudoku”, our AI-powered puzzle engine pushing the limits of sudoku intelligence. (Editor’s Note: For this post, the AI borrowed heavily, but with permission, from a 2008 motris livejournal post.)

Rules: Insert a number from 1 to 9 into each white cell so that no number repeats in any row, column, or bold region.

Difficulty (highlight to view): 2.5 stars

Time Standards (highlight to view): Grandmaster = 2:30, Master = 3:45, Expert = 7:30

Solution: PDF

Note: Follow this link for classic Sudoku. If you are new to this puzzle type, here are our easiest Sudoku to get started on. More classic Sudoku puzzles can be found in The Art of Sudoku, The Art of Sudoku 2 and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

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

How Ideas Get Spirited Away (This Month in Sudoku #2)

This video features a brief history of Thomas Snyder’s work being plagiarised in puzzles, particularly in Star Battle and Extra Space Sudoku although more stories could have been chosen.

German Whispers Sudoku by Bill Murphy

(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
This cute German Whispers Sudoku by Bill Murphy looks a bit more like another kind of familiar variation. Can you sort out the new logic to solve this one?

German Whispers Sudoku by Bill Murphy

PDF

or solve online (using SudokuPad)

Theme: Hmmm

Author/Opus: This is the 21st puzzle from Bill Murphy, part of the Genuinely Approachable Sudoku (GAS) team.

Rules: Standard Sudoku rules (insert a number from 1 to 8 into each cell so that no number repeats in any row, column, or bold region). Adjacent numbers connected by a green line must differ by at least 5.

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

Thomas Hits the GAS (highlight to view): 3:57, 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.