(Copying a message below after a day where I’ve felt better than any time in the last 5 years having made a hard life decision. If I haven’t seen you in awhile or written in awhile, this is my commitment this year to share the love with my closest network, to detoxify myself and then to reconnect with my 1000 strongest connections to then see what we can do together on the problems we don’t even know to identify yet. The spark came from thinking about my move to 2014, the story of me ending my (f)unemployment from puzzles and relearning my love of science. It was a letter to Chad. I’ll not share his response unless he agrees, but I want you to know what I’m saying to my close network of people. Writing letters as with a postage stamp may not be a scalable thing to do, but I don’t care right now as it is a great way to share clear thoughts.)

Dear Chad,

There are not enough words (certainly not these 500+) that can say how much I appreciated your love last year, hearing your family connection to mental health while going through a challenging 2022 myself.

You might have seen Verily’s reduction in workforce news. Wednesday was a tough day for me after an exhausting JPM week. I drove to my college alma mater today and cleared my head and feel quite different. It’s added up to the decision in the header, I am taking a sabbatical from full-time work in 2023. I want to slow down parts of my life so that I can speed up my thinking. I want to help change the world, to coach the teams that might be able to.

My first innovative decision is to try life without a cell phone for this year, and connect back with the people I love. I may write a scientific paper after 12 months about the experience on my mental health and on others — I have lots of good measures and I am a data scientist so there could be a story there. Having gone through DBT therapy and being observant has made me recognize even just watching the homeless and mentally ill, or trying to talk to them and seeing how often I can get through — those observations from a person like me could make a difference. I think my main research goal might become tackling mental illness, but January is just about reading non-science books and trying other things.

So to keep me accountable — that this is a sabbatical and not a retirement — I commit this year, every couple months, to write you some thoughtful notes, with no rush for you to respond back (consider it a long letter sent with a postage stamp). I will be visiting different places sometime and I would love to get a set-up like a $1 and 0 equity advisor role just so I can have a badge back if I find myself in Seattle and want a place to sit and do some thinking and don’t need to send any emails to have an open door and a hotel desk. I don’t have an admin, I don’t want an admin. I want an open door like I loved having when I was at google so I could see a foreign city and get a quick snack before heading to an airport if needed. When it is a longer stay, we should certainly arrange an invited talk, a chance for lunch or other connection with you and Harlan.

I have strong connections in 10+ cities, but yours is the only one I want to start with for Seattle, because just talking about immunosequencing with some of its pioneers may revive what I felt in 2014, a time I consider one of the most stimulating in my life as I had access to all your data and to Tableau and could just play. I want my 1-2 day experiments to be things I can share anywhere, and we’ll discuss how this might be possible later. My message today was to just say I made a decision for me and am off the market but also not working anywhere deliberately. I’m going to celebrate my 43rd birthday next Thursday by being with my best friend, their partner, and child, in Boston who I haven’t seen enough since they moved away from SF during my post-hospitalization therapy.

I know we’re not genetically related, but I consider you a dear part of my family — I only use the term for closest connections and mentors/mentees in both directions. I do hope that you are managing these tough times. No rush to respond, but I look forward to a pleasant surprise in my inbox within the next 12 months. And I’ll stand by my commitment to write when I want to share a connection and fun life experience and maybe a new idea where something is connecting in a bigger picture I want to form.

With love,
Thomas

[This is a repost from our archives with new notes at the top: Just as with classic sudoku, themes that look quite unusual (like separations of kinds of digits, far fewer than just 8 digit types, …, are some rich places to explore Tight Fit Sudoku to come up with something that looks unique. Original link here.]

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between Sudoku = big digits and Number candidate = small entries in the corners of cells.)

Theme: This Tight Fit Sudoku has separate even/odd right/left sides.

Rules: Standard Tight Fit Sudoku rules. Range is 1-9.

Estimated Difficulty*: 3 stars

Time Standards (highlight to view): Grandmaster = 2:45, Master = 5:15, Expert = 10:30

Solution: PDF

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 our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli and in The Art of Sudoku 2.

[This is a repost from our archives with new notes at the top: This Nurikabe (original post) still draws from some aspects of Nikoli puzzles at the start, but by the end starts to apply more global constraints and visualization that is very rarely seen from that publisher. Whether this is that they have a different audience than mine or something else is an interesting discussion. Fifteen years ago I learned from many of the styles/ideas they published; one goal of mine is to see that future generations of solvers draw inspiration from my prior work and my own style of puzzle design.]

PDF

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

Theme: Imbalance – the lower-left is slightly heavier than the upper-right, and is distributed less evenly, affecting the solve.

Rules: Standard Nurikabe rules.

Estimated Difficulty*: 2.5 stars

Time Standards (highlight to view): Grandmaster = 1:30, Master = 3:00, Expert = 6:00

Solution: PDF

Note: Follow this link for classic Nurikabe and this link for Nurikabe variations. If you are new to this puzzle type, here are our easiest Nurikabe puzzles to get started on. More Nurikabe puzzles can be in The Art of Puzzles, in our beginner-friendly book Logic Puzzles 101, and in the e-book Nurikabe by Ashish Kumar.

[This is a repost from our archives with new notes at the top: Our second week of puzzles paired a puzzle type from another company (see yesterday’s post) with Tight Fit Sudoku, a style I originally created for the book Mutant Sudoku. The style actually framed the whole absent-minded scientist concept behind the mutations, as I “adopted” the Dr. Sudoku nickname for myself by telling a story in puzzle form of a chemist making mistakes that led to inventive puzzles. That book by Wei-Hwa Huang and myself (illustrated and edited by Francis Heaney) is one of the best I’ve been a part of, and one goal in 2023 is to start to republish these works that we have rights back for since they’ve been out of print. It looks like this early GMPuzzle is a bit harder than our standard Tuesday difficulties would become, but that is because I wanted the first puzzle to use a few occurrences of the different kinds of thinking that the “tight fit” rule allows. Enjoy!]

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between Sudoku = big digits and Number candidate = small entries in the corners of cells.)

Theme: Somewhere Over/Under the Rainbow

Rules: Standard Tight Fit Sudoku rules. Range is 1-8.

Estimated Difficulty*: 2.5 stars

Time Standards (highlight to view): Grandmaster = 1:30, Master = 2:45, Expert = 5:30

Solution: PDF

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 our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli and in The Art of Sudoku 2.

[This is a repost from our archives with new notes at the top: Our second week of puzzles started with Nurikabe — a style originally published by Nikoli which is a company that has influenced me and many other puzzle constructors a lot. I expect my inspiration for this first Nurikabe on the site was a lot of diagonal neighbor pair puzzles on Nikoli.com and trying to do some Nikoli-style construction in this genre before pushing to my own, fairly different themes by end of the week.]

PDF

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

Theme: Twin Islands

Rules: Standard Nurikabe rules.

Estimated Difficulty*: 2 stars

Time Standards (highlight to view): Grandmaster = 0:45, Master = 1:30, Expert = 3:00

Solution: PDF

Note: Follow this link for classic Nurikabe and this link for Nurikabe variations. If you are new to this puzzle type, here are our easiest Nurikabe puzzles to get started on. More Nurikabe puzzles can be in The Art of Puzzles, in our beginner-friendly book Logic Puzzles 101, and in the e-book Nurikabe by Ashish Kumar.

(I was intending to start some more 2023 planning thoughts here today including a bonus sudoku, but I haven’t had power at my home due to recent weather since last night. For now, enjoy the first Smashing the Sudoku I released yesterday on YouTube.)

(Update Jan 9, 2023 morning: I did get power restored last night, but effectively lost a lot of momentum on this project while I worked on others. So we’ll start again next weekend, life permitting; stay well!)

[This is a repost from our archives with new notes at the top: Just as I mentioned three days ago repeating prior Sudoku themes when I get back into writing in a puzzle style, “Rhyming clues” is one of the five or so “canonical” TomTom theme ideas I’d explore time and again in books like the original TomTom Puzzles. This last puzzle of our 2013 intro week is such an example although did not resolve as cleanly in the middle as other gems I’ve unearthed during TomTom exploration. I’m very hopeful that 2023 may finally be the year to revise and expand the original TomTom puzzles book I wrote in 2009, since it has been out of print for awhile.]

PDF

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

Theme: “Rhyming clues” – almost all clues here in this TomTom are presented with identical neighbors.

Rules: Standard TomTom rules. Range is 1-8.

Estimated Difficulty*: 4.5 stars

Time Standards (highlight to view): Grandmaster = 9:00, Master = 15:00, Expert = 30:00

Solution: PDF and solving video.

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

[This is a repost from our archives with new notes at the top: Looking back at past work can show some of the interesting changes with time. For instance, our original GMPuzzles posts like this one from our first week of puzzles used more of a “conversation title/theme” which slowly became just short phrases — or no theme when it was just logical over the years. (Other very obvious updates will include removing the solving arrows, changing solving time standards, and adding in difficulty ratings — we have not tried to make any of those changes this week and have the most stripped down versions of the post here with the goal you might go back to the original.)
There is something refreshing to find after reading that “an exclusively logical theme will be revealed during the solve”. I just went through the puzzle again and found it, but then I have the unfair advantage of better knowing how to read my younger mind. I wonder when I’ll run into a puzzle where past me outsmarts current me.]

PDF

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

Theme: Besides symmetry, an exclusively logical theme that will be revealed during the solve.

Rules: Standard Sudoku rules.

Estimated Difficulty*: 3.5 stars

Time Standards (highlight to view): Grandmaster = 5:00, Master = 7:30, Expert = 15:00

Solution: PDF and solving 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 classic Sudoku puzzles can be found in our e-store, including in The Art of Sudoku, The Art of Sudoku 2 and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

[This is a repost from our archives with new notes at the top: This repost from 2013 shows its age as it was a date-themed puzzle, but it might have been the most memorable TomTom in that week because of some less typical logic I found to embed around the repeated numbers. This is where, as a constructor, taking on a rigid theme can force you to explore different kinds of thinking to get to one answer. Yes (highlight to read light spoilers), 13 is always go to be a sum, and 3 is more flexible which will be important, but how do you make some 1’s stand out? The puzzle became the first in our short-lived “Ask Dr. Sudoku” blog post series, a clear inspiration for our future YouTube channel videos. It became harder to keep writing as if I was inside the constructor’s mind when I wasn’t a constructor, but if there is any kind of content this look back is making me want our team to find a way to share more of in 2023+, it is stories like this puzzle, your experience solving it, and then clicking through to the Ask Dr. Sudoku post and seeing how I tell it back — a connection of the solver to the constructor you can’t find easily in any other place.]

PDF

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

Theme: TomTom for 1/3/13; there are also a few interesting and unusual logical deductions to be found.

Rules: Standard TomTom rules.

Estimated Difficulty*: 3.5 stars

Time Standards (highlight to view): Grandmaster = 4:30, Master = 6:15, Expert = 12:30

Solution: PDF

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

[This is a repost from our archives with new notes at the top about the creation of this puzzle originally on the site ten years ago: Several people have commented to me through the years on the look or feel of a “Snyder Sudoku” — the main example when I think of my own style is something I might share as a new/bonus puzzle on Sunday, from a competition setting and the theme is 100% hard logic right at the start. But other meanings for Snyder Sudoku are about the look of the puzzle standing out too, with esoteric but visually interesting themes far beyond just symmetry — like segregating digits or repeating exact shapes multiple times (like on the cover of The Art of Sudoku four times). When I was constructing the three sudoku for this week initially in 2013, I wanted to make callbacks to different memorable sudoku styles I’d used before in my livejournal days and in this case copied an earlier “missing digit?” idea of mine, with a new composition in the series.]

PDF

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

Theme: Missing Digit? (opus 2); this avant-garde sudoku poses the question “Is there a 5 in the grid or not?” It is similar to an earlier work by Dr. Sudoku first displayed at the Silicon Valley Puzzle Festival where a different digit, 8, was missing in the same way.

Rules: Standard Sudoku rules.

Estimated Difficulty*: 3 stars

Time Standards (highlight to view): Grandmaster = 3:30, Master = 6:00, Expert = 12:00

Solution: PDF

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 classic Sudoku puzzles can be found in our e-store, including in The Art of Sudoku, The Art of Sudoku 2 and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.