PDF

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

Theme: Common Denominations

Author/Opus: This is the 415th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Place the numbers in the indicated range (1-6) in some of the cells so that no number is repeated in any row or column. Numbers on the outside of the grid indicate the sums of adjacent number groups in that row or column, in order. Each sum is separated by at least one unused cell.

Difficulty: 2.5 stars

Time Standards (highlight to view): Grandmaster = 2:30, Master = 4:00, Expert = 8:00

Solution: PDF and solving video.

Note: Follow this link for other Japanese Sums puzzles.

Just released in our e-store is Grandmaster Puzzles Quarterly: Volume 4, our latest collection of original puzzles spanning multiple genres. This volume includes several familiar styles with the first extended section of Japanese Sums puzzles we’ve published, which will also be the style for this upcoming web week.

The full set of elegant and hand-crafted puzzles, coming from twenty-two of the world’s best puzzle designers, spans:

– 7 Even/Odd Sudoku and 4 Isodoku (Even/Odd)
– 7 Japanese Sums and 3 Easy as Japanese Sums
– 7 Minesweeper and 3 Minesweeper (Sudoku)
– 7 Nurikabe and 3 Nurikabe (Pairs)
– 7 Pentominous and 3 Pentominous (Cipher)
– 7 Castle Wall and 3 Castle Wall (Hex)

Our recent week of Balance Loop puzzles is gathered together in this PDF and the solutions are in this PDF. More Balance Loop puzzles (that are only in these books and not on our website) can be found in our e-store at this link.

The daily solution videos, this week from Prasanna, are on the posts and linked below:

Astute observers may have noticed that Japanese Sums was recently added to our Number Placement puzzle list on the main blog roster. We’ve also fully digitized the Penpa backlog for it. This upcoming week will feature this “new” puzzle to the website, as well as a Sunday Stumper next week. Japanese Sums will also be one of the six puzzle styles in Grandmaster Puzzles Quarterly 4 which will be released later today, so watch for more information on that.

Our recent week of Sudoku puzzles is gathered together in this PDF and the solutions are in this PDF. Many more original Sudoku puzzles (that have not been on our blog) can be found in our e-store at this link including our popular The Art of Sudoku series and the Masterpiece Sudoku Mixes.

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

Our next week of puzzles features Balance Loop puzzles.

Our recent week of Snake Pit puzzles is gathered together in this PDF and the solutions are in this PDF.

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

Our next week of puzzles features Sudoku and variations.

Last week’s collection of Battleships puzzles is gathered together in this PDF and the solutions are in this PDF. You can find more Battleships puzzles in these books in our e-store.

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

In a few minutes we will have a Sunday Stumper: a Battleship Sudoku by Serkan Yürekli. Our next week of puzzles features Snake Pit puzzles.

Our previous variety mix week of hexagonal grid puzzles is gathered together in this PDF and the solutions are in this PDF.

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

Our next week of puzzles features Battleships puzzles and variations. We will also have a Sunday Stumper from Serkan Yürekli in 7 days.

PDF

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

Theme: Snowflake

Author/Opus: This is the 414th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Slitherlink rules (with a hexagonal grid).

Difficulty: 4.5 stars

Time Standards (highlight to view): Grandmaster = 11:00, Master = 16:00, Expert = 32:00

Solution: PDF and solving video.

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

Today we’re excited to announce the release of the new book Tapa and Variations 3, co-authored by Zoltán Horváth and Serkan Yürekli. It features 20 classic Tapa puzzles (including one giant grid) as well as 4 puzzles in each of 9 variations for 56 Tapa in total. This book follows our release about a month ago of Starter Pack 2: Tapa which is a good way for a beginner to get into Tapa where Tapa and Variations 3 has some very challenging puzzles.

To mark the release of the new book, Serkan wrote a bonus “Tapa Sudoku” puzzle for the Cracking the Cryptic channel which you solve find here, as well as watching a solving explanation from Simon Anthony from his own experience with the puzzle as well as seeing me go through it.

Our previous week of Tapa puzzles is gathered together in this PDF and the solutions are in this PDF. More Tapa puzzles can be found in these books in our store. All of our books including the ones mentioned above feature original puzzles (not from the website), and buying these books is a great way to support the site while getting more fun logical challenges to solve.

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

Our next week of puzzles features hexagonal grids, with six different styles taken to a new logical shape by changing the grid behavior.

Our previous week of Skyscrapers puzzles is gathered together in this PDF and the solutions are in this PDF. More Skyscrapers can be found in these books in our store. All of our books feature original puzzles (not from the website), and buying these books is a great way to support the site while getting more fun logical challenges to solve.

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

Our next week of puzzles features Tapa puzzles and variations, and will also mark the release of Tapa and Variations 3, a new e-book from Zoltán Horváth and Serkan Yürekli that will be released next weekend.