Thermo-Sudoku by Thomas Snyder

Thermo-Sudoku by Thomas Snyder

PDF

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

Theme: 3/25

Author/Opus: This is the 409th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Thermo-Sudoku rules.

Difficulty: 4.5 stars

Time Standards (highlight to view): Grandmaster = 10:00, Master = 17:30, Expert = 35:00

Solution: PDF; a solution video from the Cracking the Cryptic team is available here. Thomas may come back to write a “how this was made” type video in the coming weeks but the CtC solve captures most of the intended logic.

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 The Art of Sudoku 2 and Masterpiece Sudoku Mix 2.

Battleships by Takeya Saikachi

Battleships by Takeya Saikachi

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between ship placement and shading modes. In ship placement mode, right click gives sea, left click gives circle/square, left click and drag for rounded ships.)

Theme: 0 to 3

Author/Opus: This is the 14th puzzle from guest contributor Takeya Saikachi.

Rules: Standard Battleships rules. Use the indicated fleet.

Difficulty: 3 stars

Time Standards (highlight to view): Grandmaster = 2:45, Master = 5:45, Expert = 11:30

Solution: PDF; a solution video is also available here.

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

Cross the Streams by Grant Fikes

Cross The Streams by Grant Fikes

PDF

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

Theme: 3 4 All

Author/Opus: This is the 368th puzzle from our contributing puzzlemaster Grant Fikes.

Rules: Standard Cross the Streams rules.

Difficulty: 2.5 stars

Time Standards (highlight to view): Grandmaster = 2:00, Master = 3:00, Expert = 6:00

Solution: PDF; a solution video is also available here.

Note: Follow this link for other Cross the Streams. If you are new to this puzzle type, here are our easiest Cross the Streams to get started on.

Skyscrapers (Cipher) by Serkan Yürekli

Skyscrapers (Cipher) by Serkan Yürekli

PDF

or solve online (using our beta test of Penpa-Edit tools; note that solution checking requires the eleven ciphered clues and the twenty-five interior cells to all be marked)

Theme: Numbers

Author/Opus: This is the 364th puzzle from our managing editor Serkan Yürekli.

Rules: Standard Skyscrapers rules, using the integers 1-5. Also, each letter represents a different positive integer, for the solver to determine.

Difficulty: 2.5 stars

Time Standards (highlight to view): Grandmaster = 1:40, Master = 2:45, Expert = 5:30

Solution: PDF; a solution video is also available here.

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

Note from Thomas (2022-03-22 8:18 AM PT): I rarely post my own editorial comments anywhere, but I just solved this puzzle for the first time and have to say this is really elegant and fun! Thanks Serkan for sharing this great Cipher puzzle with the world. I’m (we’re) blessed to have you as managing editor AND puzzle constructor for Grandmaster Puzzles.

Kuromasu by JinHoo Ahn

Kuromasu by JinHoo Ahn

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to shift between shading mode and the linex mode where left click+drag draws lines and right click marks X’s)

Theme: Double Sequences

Author/Opus: This is the 44th puzzle from our contributing puzzlemaster JinHoo Ahn.

Rules: Shade some empty cells black so that each number indicates the total count of white cells connected vertically and horizontally to that number including the numbered cell itself. Black cells cannot share an edge, and all white cells must belong to a single connected group.

Also see this example:

Kuromasu by Thomas Snyder

Difficulty: 1 star

Time Standards (highlight to view): Grandmaster = 0:30, Master = 1:00, Expert = 2:00

Solution: PDF; a solution video is also available here.

Note: Follow this link for more Kuromasu puzzles.

Dear GMPuzzles Family,

I haven’t been able to share more details with you on my mental health recently (not mental illness, although the first being in bad shape can lead to the other!). I wanted to give you all this update, possibly more to come later, as you all watch out for the site and for me.

Over my life, I have managed what I have called hypomanic states that can include (short) bursts of high productivity, creativity, the need to do extensive walking or running to control one’s thoughts, and diminished sleep. This past week, starting ~March 13th and provoked primarily from stresses at my scientific work, was the first time I had a full on manic episode that built over 3-4 days, including the release of an unusual amount of ideas in raw/vocal and short/tweeted form from usually dormant accounts. Over March 17th-20th, for reasons I won’t share here although they don’t involve self hurt/harm or trying to hurt/harm others, I was confined to a psychiatric ward in San Mateo for 72 hours of evaluation. I received both individual and group therapy, and have started to get better but am not yet well. Today, I was released from that facility and have my best friend watching out for me as I get resettled in my San Bruno home. I have an on-going treatment plan including on-going outpatient group/individual therapy and medications that I will be managing.

Most of the above is considered my protected health information, but I am openly sharing it because the discussion of mental health is very poor in the United States and possibly across the world. I’m not interested in hiding what I just went through, but learning more about it and making sure it doesn’t happen again to me and by proxy to others struggling with the borderline of hypomanic and manic states.

Over the coming weeks I will mostly be recuperating, and helping GMPuzzles a bit will be part of my recovery. This business is not profitable yet, but I view it as a big contribution back towards mental health given the numerous other authors and puzzle solvers who find comfort in the logic we put into the world each day. A community of both authors and solvers who may be on the autism spectrum or have dealt with depression, suicidal thoughts, or other challenging things, but been appropriately cautious to share them externally. I’m hopeful that in the coming weeks the visibility of my mental break will help us update how we all try to communicate together, by talking to people rather than talking at people, at least until we understand where they may be coming from.

I will probably be moving all of this discussion forward in other channels like my LinkedIn and not in our puzzle feed so you do not need to engage further if you do not want to.

Thanks for all your thoughts and support through the years but particularly these last few days,
Thomas (aka Dr. Sudoku)

Edited to add: Also see these videos: video 1 and video 2 for a little more commentary about where my head is at.

Edited again to add: Here is a self-contained video analyzing the week of the breakdown, some aspects of how I track my mental health, and more.

Sunday Update and Solutions

Our past Tapa-Like Loop week is gathered in this PDF and the solutions are in this PDF. More Tapa-Like Loop puzzles can be found here.

The daily solution videos are on the posts and linked below:

The next week of puzzles will be a variety mix in six different styles. All of these styles are part of the third issue of our Grandmaster Puzzles Quarterly series being completed soon.

Tapa-Like Loop by JinHoo Ahn

Tapa-Like Loop by JinHoo Ahn

PDF

or solve online (using our beta test of Penpa-Edit tools in linex mode where left click+drag draws lines and right click marks X’s on edges)

Theme: Fun with 123

Author/Opus: This is the 43rd puzzle from our contributing puzzlemaster JinHoo Ahn.

Rules: Variation of Tapa: Form a single non-intersecting loop. Clues inside the grid represent the number of neighboring cells visited by the loop; if there is more than one number in a cell, each number should be represented with a separate loop segment. There is no 2×2 rule of Tapa in this puzzle.

See also this example:

Tapa-Like Loop Example by Serkan Yürekli

Difficulty: 4.5 stars

Time Standards (highlight to view): Grandmaster = 5:00, Master = 13:30, Expert = 27:00

Solution: PDF; a solution video is also available here.

Note: Follow this link for other Tapa-Like Loop puzzles. More Tapa-Like Loop puzzles can be found in the Tapa-Like Loop Collection by Prasanna Seshadri.

Tapa-Like Loop by Prasanna Seshadri

Tapa-Like Loop by Prasanna Seshadri

PDF

or solve online (using our beta test of Penpa-Edit tools in linex mode where left click+drag draws lines and right click marks X’s on edges)

Theme: Stretch

Author/Opus: This is the 230th puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Variation of Tapa: Form a single non-intersecting loop. Clues inside the grid represent the number of neighboring cells visited by the loop; if there is more than one number in a cell, each number should be represented with a separate loop segment. There is no 2×2 rule of Tapa in this puzzle.

See also this example:

Tapa-Like Loop Example by Serkan Yürekli

Difficulty: 3.5 stars

Time Standards (highlight to view): Grandmaster = 4:45, Master = 7:00, Expert = 14:00

Solution: PDF; a solution video is also available here.

Note: Follow this link for other Tapa-Like Loop puzzles. More Tapa-Like Loop puzzles can be found in the Tapa-Like Loop Collection by Prasanna Seshadri.

Tapa-Like Loop (Transparent) by Takeya Saikachi

Tapa-Like Loop (Transparent) by Takeya Saikachi

PDF

or solve online (using our beta test of Penpa-Edit tools in linex mode where left click+drag draws lines and right click marks X’s on edges)

Theme: X

Author/Opus: This is the 13th puzzle from guest contributor Takeya Saikachi.

Rules: Variation of Tapa-Like Loop rules (Form a single non-intersecting loop. Clues inside the grid represent the number of neighboring cells visited by the loop; if there is more than one number in a cell, each number should be represented with a separate loop segment. There is no 2×2 rule of Tapa in this puzzle.). The loop can travel through clue cells. Each clue now describes the entire 3×3 area the clue cell is in the middle of.

See also this example:

Tapa-Like Loop (Transparent) Example by Serkan Yürekli

Difficulty: 2.5 stars

Time Standards (highlight to view): Grandmaster = 1:30, Master = 3:15, Expert = 6:30

Solution: PDF; a solution video is also available here.

Note: Follow this link for other Tapa-Like Loop puzzles. More Tapa-Like Loop puzzles can be found in the Tapa-Like Loop Collection by Prasanna Seshadri.