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: 2020 2021

Author/Opus: This is the 58th puzzle from our contributing puzzlemaster Ashish Kumar.

Rules: Standard Battleships rules. Use the indicated fleet.

Difficulty: 2.5 stars

Time Standards (highlight to view): Grandmaster = 2:15, Master = 3:15, Expert = 6:30

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.

PDF

or solve online (using our beta test of Penpa-Edit tools; use the tab key to alternate between shading and number entry modes)

Theme: Year of Outreach

Author/Opus: This is the 71st puzzle from our contributing puzzlemaster John Bulten.

Rules: Standard Nanro rules.

Difficulty: 2.5 stars

Time Standards (highlight to view): Grandmaster = 1:45, Master = 3:00, Expert = 6:00

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

Note: Follow this link for Nanro puzzles on this website and this link for variations on Nanro puzzles. If you are new to this puzzle type, here are our easiest Nanro Puzzles to get started on. More Nanro puzzles can be found in A Number o’ Nanro by Prasanna Seshadri.

PDF

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

Theme: 2020 2021

Author/Opus: This is the 195th puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Standard Yajilin rules.

Difficulty: 1.5 stars

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

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

Note: Follow this link for classic Yajilin and this link for Yajilin variations. If you are new to this puzzle type, here are our easiest Yajilin to get started on. More Yajilin puzzles can be found in The Art of Puzzles 2, in Yajilin by Murat Can Tonta and Prasanna Seshadri, and in our beginner-friendly book Logic Puzzles 101.

Dear solvers,

I hope you all enjoyed the “Best of 2020”. The collected PDFs are in all the web posts and also on our all weekly PDFs page.

Our “Best of …” selection process tried to be as consistent as possible with prior years, but some technical issues with the solving/fave widget meant we did add in web comments and tester feedback as additional signal for the best puzzles. If you think we missed a particularly awesome puzzle, please tell us (and in 2021 keep commenting on the posts when you like something as that is the most direct way for authors to see your feedback).

One small update on the solving widget: there are still users with login issues and the necessary fix requires a larger lift-over of the tool and database to our servers; we’ve contracted for this project so hope it returns to its old form in the next couple months.

One big update for 2021 is that we are going to include a digital solving option with automated solution checking for all puzzles.* We have set up Penpa-Edit on our site, and will be using it in a kind of “beta” mode as we find the best ways to present a variety of puzzles (with good documentation/instructions) including making some style changes over the coming months to integrate the current version more with the site. At the start, a lot of the help may be missing so if you aren’t already an experienced Penpa user, please look for some of our first solving videos to help a bit.

One last update for now is that in 2021 we will have a few “Sunday Stumpers” that are very, very hard puzzles. Seeing how difficult puzzles can seem fair to post if there are solving walkthroughs eventually connected to show the logical route, we will try to post a Sunday Stumper once a month including next Sunday at the end of our “Welcome to 2021” week. New puzzles, including the first with penpa-edit, will start tomorrow.

Best wishes for a great 2021,
Thomas (aka. Dr. Sudoku)

(*One impressive thing about Penpa-Edit as it has grown is that we can cover 99+% of the puzzles we’ve posted in the past — there is only one puzzle in our initial weeks of 2021 where a slight modification will be required to present the puzzle in a solvable form.)

Here are our best Sudoku puzzles of 2020, in chronological order, selected from the 32 web posts in this category based on FAVE votes, web comments, and tester comments. All of these puzzles are gathered in this PDF file.

With 1 day left before our official reopen, Dr. Sudoku shared this minimal clue “countdown” Consecutive Pairs Sudoku puzzle that got a good number of FAVE votes.

A few months later, guest contributor Bryce Herdt’s Thermo-Sudoku ran “hot” with our solvers, with a nice visual theme and fun solving path to the answer.

While on the easier side, this “Big X” Consecutive Pairs Sudoku from Thomas Snyder was another favorite sudoku puzzle from the year.

A few classic sudoku got strong reviews through the year, but none more so than this excellent Sudoku by Swaroop Guggilam which was clearly one of our Best 2020 Sudoku.

Our final best of 2020 Sudoku comes from Ashish Kumar who made an XV Sudoku with a theme referring to the letters, and a pretty minimal path taking advantage of the “XV rules” throughout.

Here are our best Object Placement puzzles of 2020, in chronological order, selected from the 33 web posts in this category based on FAVE votes, web comments, and tester comments. All of these puzzles are gathered in this PDF file.

This Star Battle puzzle from Thomas Snyder (our first in many months that announced we were coming back) got the most FAVE votes for the year, but probably as much for the news as for the puzzle itself, with 22 stars to be placed with 22 days before re-launch.

Serkan Yürekli wrote this favorite Battleships with a slightly unusual solving path that solvers enjoyed.

Guest contributor JinHoo Ahn wrote another of our Best of 2020 puzzles with this “Double Numbers” Battleships with a very elegant theme and solving path.

2020 featured a lot of Star Battle puzzles on the site and in our store; this Star Battle from Ashish Kumar with a nice symmetric set of regions got a good response from our solvers.

Our final best of 2020 in object placement came in October from Murat Can Tonta, with a Statue Park themed around the corner placements.

Here are our best Number Placement puzzles of 2020, in chronological order, selected from the 32 web posts in this category based on FAVE votes, web comments, and tester comments. All of these puzzles are gathered in this PDF file.

Our reopening announcement puzzles got a lot of attention and Thomas Snyder’s TomTom puzzle with two spirals counting down 15 days to go was a favorite Number Placement puzzle of 2020.

John Bulten constructed another great TomTom variation, TomTom (Cipher), where solvers appreciated the different logical steps to get to the one solution.

Blending the “thermometer” constraint with standard Skyscraper rules led to this clueless Thermo-Skyscrapers puzzle from Serkan Yürekli that got favorable feedback.

Another Skyscrapers puzzle that was well liked was this challenging 6×6 puzzle by Ashish Kumar with a fairly narrow logical path.

Our final Best of 2020 in Number Placement came from Prasanna Seshadri: this
Kakuro puzzle with a fun (but hard) solving path.

Here are our best Shading puzzles of 2020, in chronological order, selected from the 32 web posts in this category based on FAVE votes, web comments, and tester comments. All of these puzzles are gathered in this PDF file.

A few of our best Shading puzzles were “Skyscrapers” variations with outside clues driving the solve. The first of these comes from guest contributor Freddie Hand: Tapa (Skyscrapers).

More shading + skyscrapers came soon thereafter from Prasanna Seshadri with this great Kurotto (Skyscrapers) puzzle.

Many April Fool’s Days ago I made an audiobook TomTom set of puzzles (that was not just a set of fools) which was followed a few years later by a Cross the Streams (audiobook) by Grant Fikes. Grant revisited this clever idea in 2020 with a new Cross the Streams (audiobook) that was a favorite shading puzzle.

December brought two great LITS puzzles, starting with this LITS by JinHoo Ahn with an elegant theme (and quite approachable difficulty).

Our last best shading puzzle of 2020 is this more challenging LITS by wormsofcan that asked solvers to think outside the box.

Here are our best Region Division puzzles of 2020, in chronological order, selected from the 31 web posts in this category based on FAVE votes, web comments, and tester comments. All of these puzzles are gathered in this PDF file.

The Saturday challenge from our first week of web puzzles was a delightful Fillomino puzzle from guest contributor Elyot Grant.

As we reached the end of June, we posted what was one of the highest rated (and also fairly hard) puzzles of the whole year: a Pentominous by JinHoo Ahn, another guest contributor who surprised us with a lot of great submissions this year.

Puzzlemaster Prasanna Seshadri shared an Araf puzzle with different clusters of small and big numbers and a very elegant logical solving path.

November included a really great Cave puzzle from William Hu, with a beautiful all odd theme and clever logic to be found on the solving path.

And our last post of 2020 also got a good response from our solvers and closes out this Best of set: this Fillomino (Checkered) variation by Jonas Gleim.

Here are our best Loop/Path puzzles of 2020, in chronological order, selected from the 26 web posts in this category based on FAVE votes, web comments, and tester comments. All of these puzzles are gathered in this PDF file.

A lot of our early puzzles as we were relaunching the website got a good number of FAVE votes. And we seemed to start out strong with this first regular post: an antisymmetric no-numbers Balance Loop by Murat Can Tonta.

Murat had another favorite puzzle with this “Parallel Universes” Slitherlink with an interesting logical path around the grid.

Serkan Yürekli put a little uncertainty into this Slitherlink variation with several missing numbers that must fulfill Sudoku-like constraints. The logical challenge got a lot of favorable comments.

Serkan delighted us again in September with a visually beautiful Snake (Cipher) puzzle that announces itself on the outside of the grid.

Our final best Loop/Path puzzle of 2020 comes from this November post from Tom Collyer, who focused on some less common patterns to give us a really challenging Slitherlink.