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GMPuzzles is now cooking with GAS

TL;DR: Our goal to step into more things in Sudoku means working with some of the important new voices in Sudoku. Starting today, Grandmaster Puzzles is partnering with the Genuinely Approachable Sudoku (GAS) team to publish their daily puzzle on this site, helping to gain more visibility and a wider audience for this great sudoku series, and setting the stage for more joint projects in the future to showcase the art of sudoku. I’m quite excited to welcome Clover, Philip, Bill, and their puzzles to our community!

Genuinely Approachable Sudoku logo by 8th

Long form: Over the last year, the GMPuzzles team has become involved in making daily games for other partners, primarily easier logic games that still demonstrate all the potential of hand-crafted design. These games have become a part of the daily routine for a large audience including casual solvers who have never experienced a lot of puzzle types before. However, we haven’t been able to have regular content on this blog because of the time it takes to create and edit these puzzle projects.

Still, the focus on daily puzzles sparks a question: “Thomas, if you had to choose a puzzle to do every day, not from GMPuzzles, what would it be?” Here I have an immediate answer: Genuinely Approachable Sudoku.

Whatever you think of the pandemic-era Sudoku boom, that made Sudoku streaming and very difficult stunt puzzles more common, that made “Snyder notation” a terminology even if not applied like I did to win three world titles, the “second boom” didn’t change much about the way I think about Sudoku or why I love certain puzzles. That is because it takes a lot more than passion alone, or computer tooling and assisted generation that make publishing easier, to achieve a great puzzle. Almost anyone can mash a subset of a hundred variation ideas together in random ways and have something “new”, but the steps to make a masterpiece are harder. It takes human creativity matched with editing feedback and the instinct to think like the solver, to make a puzzle beautiful in all the ways a puzzle can be when you were first getting into puzzles, and not only making the next puzzle for yourself which is crazy hard and misses the audience.

I’ll admit that I haven’t tracked the dozens of individual authors that have popped up since 2020 very much. And no solver has shared a Sudoku from Logic Masters Deutschland with me because they found it super cool and thought I should see it. So a lot of the pandemic boom has just passed me by, much as the 2005 Sudoku boom probably passed all of Japan by because nothing “new” came out of it for the Japanese nanpure/Sudoku audience.

But I have been watching out for the first effort that set out and achieved an interesting and important goal: making an easy sudoku variation every day that can get more people into solving Sudoku of all kinds. That takes a lot more than basic puzzle making to pull off.

The Genuinely Approachable Sudoku (GAS) project was started by Clover four years ago today (June 7, 2021). Since week two it has comprised a group of three authors/editors/superstars working together, originally Clover, Philip Newman and Sam Cappleman-Lynes; since late 2022, Bill Murphy has replaced Sam. Every day they have made an approachable puzzle that may help a new/unfamiliar variation make sense to an audience that hasn’t seen it before, or they may bring something fresh to a regular style whether it is the solver’s first or one hundredth solve. They have created an on-going series and a devoted audience, and recently they added me to those ranks.

I was curious to learn how the GAS team gained their “editing” prowess, since that usually takes outside / experienced voices. I won’t reveal their approach, but I was able to work with some of the team at SudokuCon both in writing puzzles and running events. I usually have a lot of comments when first working with a puzzle author; that I had “no notes” for Clover’s Just One Cell puzzles which have posted here on the blog over the last few weeks is one sign of my respect for these next-generation authors. They have found a way to do something similar in spirit but different in execution to my own goals for GMPuzzles.

GAS chooses variations I love, and also chooses variations I wouldn’t touch (sometimes for good reasons and sometimes where I have judged too soon the value of a rule set and should look again). They usually do it with elegant “Just One Cell”-like simple break-ins that are unique to the individual puzzles and add to the fun as Ahas that confirm you understand the rules and designer intent.

While GMPuzzles will be posting the puzzles here, GMP is not going to add our own editorial decisions/processes unless asked. We want the full breadth of GAS ideas to come in for awhile as is, exposing our audience and me to some new ideas. I’ll be solving every day alongside you to see what pops up, sharing my blind solve times and steps in SudokuPad and sometimes my comments. Some days I will be slow (solving online in SudokuPad without Snyder notation is hard but I’ll try to get used to it, maybe by making new notations that are possible there). Other days I might solve faster than you expect because I’m in the author’s head as they are constructing something I’ve thought about before. For sure, we don’t know all the ways we’ll be able to support each other across Sudoku projects yet, but this collaboration should let us do more things for the good of Sudoku.

Just One Cell Qualifier PDFs and Upcoming Schedule

The 24 main puzzles for the Just One Cell Competition at SudokuCon that have been featured over the last two weeks are here:

Qualifier Test PDF

Qualifier Solutions PDF

After 36 minutes, there was one perfect finisher and several other high scores on that qualifier that moved onto the playoffs where two groups of four matched up to determine a final four and then just one winner. Starting tomorrow we will feature the semifinal puzzles, while today we have some extras kept as back-ups.

While our Just One Cell posts end on June 6th, we have some exciting things coming June 7th, so keep coming back to see what is next for the future of Sudoku on GMPuzzles.

How to Solve Sudoku Like a World Champion

At SudokuCon, I brought together a lot of my stories and talks from 2006-2011 to tell my story of “How to Solve Sudoku Like a World Champion”. This video should tell you a lot about me and my journey to winning three world championships as well as some of unexpected things that go alongside that. The video should also (A) give you insights into ways to scan and notate Sudoku and when to apply them, (B) show you how to train for competitions and know you are making progress, and (C) offer up some other interesting ideas on geometry, sudoku construction, and more. On YouTube, there are many chapter marks to help explore the video for specific topics.

A Sudoku Proposal for GMPuzzles

Summary and Schedule:
Starting tomorrow, we are going to return to having daily posts here, focused on Sudoku. This will begin with content prepared for the first-ever SudokuCon in Boston and then expand out in other ways as we explore some different opportunities in this remarkable number placement genre.

Over three weeks we will have ~40 Just One Cell Sudoku puzzles prepared for a competition at SudokuCon that was organized by Clover and Thomas Snyder, with at least two “puzzles” a day:

  • May 19-24: 12 classic sudoku JOC grids from the qualification test
  • May 26-31: 12 variant sudoku JOC grids from the qualification test
  • June 1-6: Playoff puzzles and other extra puzzles (classics and variant JOCs)

On May 25th, we’ll also have a link to a 2.5+ hour video on “How to Solve Sudoku Like a World Champion”. Here is a summary for this curious and entertaining talk:

  • Thomas Snyder, aka Dr. Sudoku, won three world sudoku championships (’07, ’08, ’11) in the early years of the Sudoku craze. In this video you’ll hear stories from many years of competing, including what different sudoku championships entail, how to identify your strengths and weaknesses in solving sudoku, and ultimately train to get faster at solving under pressure. From tales of catching a sudoku cheater to the origins of Snyder’s own solving notation, this talk will take you deep inside the world of speed-solving and how top competitors think.

After that, we have additional ideas to continue to showcase the best that Sudoku has to offer, including more than just puzzles. Sudoku will stay our focus for awhile here on the blog as we continue to work with our partners on other logic puzzles.

A message from Thomas (Dr. Sudoku):
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Come hear Dr. Sudoku at SudokuCon in Boston, April 3-6

I wanted to share a quick note to this community that I am a speaker at the first (to my knowledge) sudoku convention, SudokuCon, to be held in the Boston area early in April.

I will be contributing to two sessions:

Just One Cell Sudoku on Friday the 4th at 2 PM:
Like chess puzzles compared to full games of chess, Just One Cell Sudoku are short, bite-sized snacks of Sudoku logic where each grid has just one cell where a logical placement can be made. The “winning move” can be anything from a basic single to a more advanced chain of logical steps that finally unlocks the answer. We’ve created a playful set of these puzzles as a contest for everyone to enjoy.

and also
How to Solve Sudoku Like a World Champion closing out Saturday the 5th from 5:30-7 PM:
Thomas Snyder, aka Dr. Sudoku, won three world sudoku championships (’07, ’08, ’11) in the early years of the Sudoku craze. Come hear stories from many years of competing, including what different sudoku championships entail, how to identify your strengths and weaknesses in solving sudoku, and ultimately train to get faster at solving under pressure. From tales of catching a sudoku cheater to the origins of Snyder’s own solving notation, this talk will take you deep inside the world of speed-solving and how top competitors think.

See more info including the full schedule at sudokucon.com. While I’m not as connected with the sudoku streamer community organizing the convention as you might expect, I look forward to meeting old friends and making some new ones in Boston.

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In terms of other site news, we’re still working hard on some external projects that will launch later this year, and we also hope to get back to releasing a few GMPuzzles collections of unreleased puzzles in ebook form in 2025 too. So keep occasionally checking here for news on what we are doing!

Message to the GMPuzzles Community

After twelve years and over three thousand puzzles worth of free entertainment, the GMPuzzles team has made the hard decision to bring the “blog era” of this site to a close. Despite many attempts through the years, we have not been able to make either the community or the business model work in a blog format to unlock the best from our puzzles. There might still be some posts here from time to time with bonus puzzles, and we intend to maintain this website indefinitely given the incredible library of puzzles here. But there should be no expectation of new “daily content” again in the future.

For 2025, GMPuzzles will focus on several of our partner projects bringing daily puzzles to hundreds of thousands of solvers on other platforms. We will also explore alternate ways to package our content for new audiences. In future years, we might find ways to radically redesign this website and launch a new puzzle platform, but our current ambitions are mostly to be the world’s best puzzle designers and to publish through other platforms where they work for our goals.

While our founder, Thomas Snyder, found an unusual way to say goodbye, he hopes the spirit of beautiful puzzles and pushing the limits of sudoku and other puzzle construction continue in those who were drawn to the site. Thomas will be starting a new place for his own blogging, and we the team echo his thoughts that it has been a great 12 years and we’re still excited for the future of Grandmaster Puzzles in whatever shape that takes.

Thanks to all who have been fans, and we hope you run into our puzzles again in the future.

Announcing: The Twelve Days of Sudoku

Twelve Days of Sudoku by Thomas Snyder

Early reviews that chatGPT was probably prompted enough times to finally hallucinate include:

  • “The best thing Snyder’s done to improve understanding of logic puzzle construction since Puzzlecraft
  • “Mostly clueless, certainly too focused on the number forty-five which isn’t the answer to anything, but fun nonetheless”.

Join the discussion on the GMPuzzles Discord.

Note: The puzzle in the image above, a perfect combination of ideas we’ve explored in 2024 (one-star Queens/Star Battle and creative Sudoku), is a Christmas favorite from 2018.

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Added (2:05PM) Several people have asked what kind of sudoku might appear, people who are interested in puzzles and wanted to check in on me as we tend to do at the end of the year (I turn 45 in January and have had a good year, thanks for asking!).

Well, the main series is going to be Classic Sudoku as you know it. Because it is interesting to me for a lot of reasons including testing approaches to competition and puzzle setting / design rules and searching for unexpected things where people have stopped looking.

But I have been thinking of other interesting ideas to share for those who aren’t into classic sudoku puzzles but like other puzzles and things. Ideas that might pop up when I’m also thinking about the silly “is AI coming to take my job” question as I got in a recent interview on LinkedIn. As a creative thinker and problem solver, I can do more with a broken pencil than an AI in puzzle design even if I prefer to work digitally and with software tools and even AI sometimes.

Today, I challenged myself to write the most interesting sudoku I could with just one missing digit. It is a fun prompt to give a puzzle constructor and/or AI because it might not make sense. The image below isn’t my answer. But it is a start.

Twelve Days of Sudoku by Thomas Snyder

I didn’t go smaller, as it turns out I can’t outdo Randall’s Binary Sudoku but that doesn’t have proper regions anyway so I argue this is the absolute smallest for a 1-cell blank puzzle.

And in terms of what is coming, I have written the most interesting 80-given Sudoku-ey thing in history with one missing cell I’d love to see how you’d fill. But it’s not ready to share yet. It is the Ulysses of 1-cell missing Sudoku and before today you didn’t even think about those.

End of Season 4 Preview Week

We hope you enjoyed the recent “preview week” of puzzles for Season 4 of Grandmaster Puzzles.

Click here for a PDF of all the preview week puzzles.
Click here for a PDF of all the solutions.

Starting tomorrow will be the first subscribers-only week of this season, featuring Star Battle puzzles and variations. The easier warm-up puzzles will still be here for everyone to see but the main blog puzzles and the interesting Sunday Specials will be for subscribers only. Overall there will be 12 weeks and about 100 subscriber only puzzles in Season 4. Subscriptions can be purchased in our e-store at this link.

We also have a special deal for people who purchase before the end of September: Get (a maximum of) $4 off any other book/subscription on the GMPuzzles store by adding that item to the same cart when you purchase Season 4. This is a great way to pick up another GMPuzzles book, or to catch up on prior subscriptions where you’ll be able to get access to all puzzles and blog posts right away.

Season 4 – Free Preview Week

We’re back for a fourth season of our elegant hand-crafted logic puzzles on Grandmaster Puzzles. This next week will be a free preview of what a subscription week is like. From Monday to Saturday there will be 2 daily puzzles, starting with a warm-up puzzle on the easier end and then a regular puzzle (scaling difficulty through the week). During the season itself, the warm-up puzzle will be free for everyone but the regular puzzle will be for subscribers only.

Subscribers will also get access to a Sunday Surprise every week, things like larger puzzles, extra hard stumpers, puzzle hunt puzzles, experiments with new genres, contests, and more. All puzzles have digital solving options and PDF files, as well as solution animations to help you understand steps where you might get stuck.

The schedule for the free preview week is:
Monday: Aqre
Tuesday: Math Path
Wednesday: Yajilin
Thursday: Star Battle
Friday: Fillomino (Non-consecutive)
Saturday: Consecutive Pairs Sudoku
Sunday: Masyu (giant but gentle)

Starting next Monday, the main puzzles will be for subscribers only. Subscriptions to Season 4 are $12 (only $4 per month) for about 100 puzzles.

We also have a special deal for people who purchase before the end of September: Get up to $4 off any other book/subscription on the GMPuzzles store by adding that item to the same cart when you purchase Season 4. This is a great way to pick up another GMPuzzles book, like our Starter Pack for Star Battle, or to catch up on prior subscriptions where you’ll be able to get access to all puzzles and blog posts right away.

End of Season 3 Preview Week

We hope you enjoyed the recent “preview week” of puzzles for Season 3 of Grandmaster Puzzles.

Click here for a PDF of all the preview week puzzles.
Click here for a PDF of all the solutions.

Starting tomorrow will be the first subscribers-only week of this season, featuring Fillomino puzzles and variations. Overall there will be 12 weeks and greater than 150 puzzles in Season 3. Subscriptions can be purchased in our e-store at this link.

We also have a special deal for people who purchase before the end of June 15th: Get (a maximum of) $4 off any other book/subscription on the GMPuzzles store by adding that item to the same cart when you purchase Season 3. This is a great way to pick up another GMPuzzles book, or to catch up on prior subscriptions where you’ll be able to get access to all puzzles and blog posts right away.