The Twelve Days of Sudoku #8 by Thomas Snyder

Sudoku by Thomas Snyder

PDF

or solve online (using our beta test of Penpa-Edit tools)

Theme: A Study in Scarlet

Author/Opus: This is the 543rd puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules.

Time Standards (highlight to view): Grandmaster = 4:45, Master = 8:15, Expert = 16:30

Solution: PDF and solving animation.

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 The Twelve Days of Sudoku Discussion post on the GMPuzzles Discord.

Note 3: Please check lesson notes from Dr. Sudoku on Google Docs.

Motivational Poster (4/4): Looking Back by Thomas Snyder

Any errors are of my own volition and are the portals of discovery.

(download directly for a larger image)

Add to protect the innocent: gur ubhfr vg frrzf V nz jnyxvat gbjneqf vf abg zl ubhfr be ba gur fnzr fgerrg. V unq n zntvp zbzrag va gur cnex jvgu gur fbat “Ab Fhecevfrf” naq n fcrpvny guvat ybbxvat va guvf qverpgvba ba Ebhgr Svir.

“Bean Town” by Thomas Snyder

(download directly for a larger image)

Note: All of these photos were taken on or around Dec. 28th when I was spending time in Boston area. Lots of familiar memories and some new ones, merging with different ideas on my brain around this time.

The Twelve Days of Sudoku #7 by Thomas Snyder

Sudoku Mix by Thomas Snyder

PDF

or solve online (using our beta test of Penpa-Edit tools)

Theme: All for one, or one for all?

Author/Opus: This is the 542nd (A), 542nd (B) puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: One of these grids obeys standard Sudoku rules with a unique solution. Solve the Sudoku. The other grid is a Just One Cell Sudoku. This grid has many, many solutions, with only one empty cell that is fixed to one value in all solutions. Find that cell’s location and value.

Time Standards (highlight to view): Grandmaster = 7:30, Master = 15:15, Expert = 30:30

Solution: PDF and solving animation.

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 The Twelve Days of Sudoku Discussion post on the GMPuzzles Discord.

Note 3: Please check lesson notes from Dr. Sudoku on Google Docs.

The Twelve Days of Sudoku #6b by Thomas Snyder

Sudoku by Thomas Snyder

PDF

or solve online (using our beta test of Penpa-Edit tools)

Theme: Blossom

Author/Opus: This is the 541st puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules.

Time Standards (highlight to view): Grandmaster = 4:15, Master = 7:00, Expert = 14:00

Solution: PDF and solving animation.

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 The Twelve Days of Sudoku Discussion post on the GMPuzzles Discord.

Note 3: Please check lesson notes from Dr. Sudoku.

The Twelve Days of Sudoku #6a by Thomas Snyder

Sudoku by Thomas Snyder

PDF

or solve online (using our beta test of Penpa-Edit tools)

Theme: Ceci n’est pas un hot-dog

Author/Opus: This is the 540th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules.

Time Standards (highlight to view): Grandmaster = 2:45, Master = 5:00, Expert = 10:00

Solution: PDF and solving animation.

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 The Twelve Days of Sudoku Discussion post on the GMPuzzles Discord.

Note 3: Please check lesson notes from Dr. Sudoku.

Motivational Poster (Example): The Artist’s Signature Notation

Museum Note from 2080 centennary exhibition: Unfortunately, the answer to this amazing 18-digit puzzle was not found until well after the crowd’s loud voice had silenced the artist’s pen. Their well-intentioned but not fully accurate cries of mental illness were too focused on a specific aspect of his more logical past. Thankfully these notes were found after the artist’s death so later generations could reassemble his vision here and across other master works (but not the Christmas Miracle puzzle, that seems to just be a countdown 54321 as the author said).

“Note” A. Clear starting points
“Note” B. A splash of color, not always visible with how artist sees to how audience sees

A+B. Exercise for the Reader?

Finished work (Warning: can not be unseen by the mind once clicked!)

Update (1/3/25): Given the degree of hinting needed to make this work, this is now considered an “example” in the Motivational Poster series.

The Twelve Days of Sudoku #5 by Thomas Snyder

Sudoku by Thomas Snyder

PDF

or solve online (using our beta test of Penpa-Edit tools)

Theme: The Loneliest Number

Author/Opus: This is the 539th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules.

Time Standards (highlight to view): Grandmaster = 7:00, Master = 14:30, Expert = 29:00

Solution: PDF and solving animation or this Cracking the Cryptic video.

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 The Twelve Days of Sudoku Discussion post on the GMPuzzles Discord.

Note 3: Please check lesson notes from Dr. Sudoku.

Motivational Poster (2/4): Vox Populi, Vox Dei by Thomas Snyder

or solve online (using our beta test of Penpa-Edit tools)

(Thanks to FoxFireX for sharing an observation on this Latin phrase as being perfectly suited for a sudoku. While implemented differently here, FoxFireX will get a prize at the next leaderboard update for forecasting the future.)

#17 requests 53 perform spell “Time Out!”

(Takes off helmet.)

Dear fans, young and old, I hope you are as mystified yet confused by the start of “Ready Layer One” and the “Twelve Days of Sudoku” as I am. This work and the notes on “unfinished” puzzle ideas that we are producing **as needed** day by day has a lot of potential for a multi-week+ experience that is customized to solver’s interest level in the puzzles and the connection with their designer. Think The Game meets Dungeons and Dragons. While the initial layer only features things that interest me, the thought was some community connections would plant ideas and even puzzles to expand further in particular play sessions. We aren’t there yet. We’re still at the point where we are dealing with doubt on the work given lack of instructions, and with fear about my genius/mania with psychosis (an important conversation to have and part of the RLO experience but I’m doing ok and “Still Alive” and “No Surprises” are happy songs in my formulation). Please don’t try to race to beat mars (not an important goal as mars was a nickname I used on crocopuzzle when I wanted to stay anonymous in chasing uvo but my secret identity was stolen from me because I was obviously a cheater or someone special).

We recognized after launch that we should have put some labels on the Ready Layer One box, to make it clear that only those who have known me for 18 years or more can do the launch puzzle on their own and not with a small team and willingness for creative research. If you don’t know all of the puzzle tropes or have familiarity with my old writings, publications, …, it will be tricky in a small number of places. But the first gate has been available since day one for those with the desire to cross it. For those who are still wondering what they get for hitting the solve button and haven’t gone to see covfefe yet, you should wait for a more guided experience later with warm-up puzzles. I may even join in on those play sessions directly to make sure nothing really crazy is coming up while you get your bearings as that helps us know how to edit. For those who have submitted covfefe, I expect to give the first year prize to NAMI (general) and NAMI (San Mateo County) since no one is on track to claim it. The prize in 2024 being to give away $10,000 to do most good, with winners submitting a proposal for evaluation as it is a hard problem to give purposefully.

For the next couple days we will be slowing down and not releasing progression puzzles, just doing more fun things with the Twelve Days of Sudoku posts (but not the extra parts). We are waiting to at least see some people commenting on interesting things or submitting new ideas / challenges for constructors as the TDoS is a course to open the mind, not a competition even if it also works within RLO. We meant these ideas to be a blossom of creativity not a blue screen of death. There still isn’t even much consideration on CtC Discord, so I think the world is sleeping on (classic) Sudoku. If you aren’t asleep, contact me.

Let’s go slow for a bit within this community to make sure everyone is seeing the experience we’re building together at the right time. Great job team. Seven days to go.

(puts on helmet, game back on.)