Sudoku by Thomas Snyder

Sudoku by Thomas Snyder

PDF

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

Theme: Desperately Seeking Seven (Note: the shading of the “7” shaped region is just for artistic purposes.)

Author/Opus: This is the 173rd puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules (no repeats in any rows, columns, or bold regions). The digit range is 1-7.

Answer String: Enter the 2nd row from left to right, followed by a comma, followed by the 5th row from left to right.

Time Standards (highlight to view): Grandmaster = 1:15, Master = 2:00, Expert = 4:00

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

Hamle Sudoku by Prasanna Seshadri

Hamle Sudoku by Prasanna Seshadri

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between Sudoku number entry mode and a shading mode to mark the top grid.)

Theme: Clue Symmetry and Logic

Author/Opus: This is the 17th puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Variation of Sudoku rules. Each number in the top grid must be moved either up, down, left, or right the same number of cells as that number’s value without crossing the border of the grid. Numbers must all land on unique spots, but unlike in normal Hamle numbers may be adjacent after moving and white areas may not all be connected. Then solve the resulting sudoku. (Note: It is possible for a number to have two valid movement options in the solution; it is only required that at least one direction of movement exists for each number.)

Answer String: Enter the 2nd row from left to right, followed by a comma, followed by the 5th row from left to right.

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

Solution: PDF

Note: Follow this link for other less common variations of Sudoku. Many specific variations of Sudoku have their own categories in the sidebar to the left. Follow this link for classic Sudoku.

Sudoku by Thomas Snyder

Sudoku by Thomas Snyder

PDF

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

Theme: Flyers

Author/Opus: This is the 169th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules.

Answer String: Enter the 6th row from left to right, followed by a comma, followed by the 9th row from left to right.

Time Standards (highlight to view): Grandmaster = 5:30, Master = 11:00, Expert = 22:00

Solution: PDF; a solution video is available here.

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

Wordoku by Grant Fikes

Sudoku by Grant Fikes

PDF

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

Theme: Solve Me, I’m Irish

Author/Opus: This is the 94th puzzle from our contributing puzzlemaster Grant Fikes.

Rules: Variation of Sudoku rules. Instead of the digits 1-9, use the letters in “SHIRT PACK”.

Answer String: Enter the 2nd row from left to right, followed by a comma, followed by the 8th row from left to right. Use capital letters (i.e. “SHIRTPACK”) when entering each row.

Time Standards (highlight to view): Grandmaster = 2:15, Master = 4:00, Expert = 8:00

Solution: PDF

Note: Follow this link for other less common variations of Sudoku. Many specific variations of Sudoku have their own categories in the sidebar to the left. Follow this link for classic Sudoku.

Sudoku by Thomas Snyder

Sudoku by Thomas Snyder

PDF

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

Theme: Four Y Intersection

Author/Opus: This is the 166th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules.

Answer String: Enter the 4th row from left to right, followed by a comma, followed by the 7th row from left to right.

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

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

Sudoku by Grant Fikes

Sudoku by Grant Fikes

PDF

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

Theme: Butterfly — a very elegant 22-given pattern

Author/Opus: This is the 78th puzzle from our contributing puzzlemaster Grant Fikes.

Rules: Standard Sudoku rules.

Answer String: Enter the two main diagonals, starting with the 9 digits in the upper-left corner to the lower-right corner, followed by a comma, followed by the 9 digits in the lower-left corner to the upper-right corner.

Time Standards (highlight to view): Grandmaster = 1:45, Master = 2:30, Expert = 5:00

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

Best of 2013: Sudoku

(A PDF of the puzzles from week 52 can be found here.)

There will be no new puzzles this week as we look back on the first 52 weeks (and 322 puzzle posts) at GMPuzzles. Over the next six days we will be presenting our “Best of 2013” selections, using data from the FAVE button at the bottom of each post. Because of a variable number of solvers over the year, the selection process included raw FAVE counts, FAVE/solver ratios, and internal discussions when those values brought up ties. Today, we present the nominees in our toughest category (with 77 entries) of BEST SUDOKU:

Big and Small from April was a Classic Sudoku with an uncommon separation of givens that also affected the logic of the solve.

Sudoku by Thomas Snyder

Start Small from May was a Tile Sudoku that many found to be a good pedagogical example for how to solve this style of puzzle.

Tile Sudoku by Thomas Snyder

Boxed In from January was a Thermo-Sudoku with an interesting visual pattern but no givens. The logical path was highly influenced by the “box” theme and many solvers appreciated the very first required deduction.

Thermo-Sudoku by Thomas Snyder

It’s Sudoku Time from December was a late nominee but a popular one. This arrow sudoku resembles a clock with just 5 givens (at 12, 3, 6, and 9) to get the solver started.

Arrow Sudoku by Thomas Snyder

And, by absolute vote count, the favorite sudoku of 2013 is:
Jekyll and Hyde, a consecutive sudoku from February that merges that genre with non-consecutive puzzles with a half empty/half full kind of theme.

Consecutive Sudoku by Thomas Snyder

The “Best Sudoku of 2013” are all gathered together in this PDF.

Tomorrow we will announce our best number placement puzzles from 2013.

Sunday Surprise #11 – Basement Skyscraper Sudoku

I’m sure many of you were expecting ANOTHER version of the Christmas Tree puzzle from the last two weeks. I mean, I did get a very nice Double Back from Robert Vollmert (which cannot be confused as a Star Battle or a LITS). But posting such a puzzle wouldn’t be a surprise.

No, today’s Sunday Surprise comes from the pile of submissions I’ve received over the year from Hans van Stippent, who played with the usual rules of Skyscrapers a bit by hiding some of the cells from consideration. It yielded a very interesting puzzle which is Hans’ gift to you this Sunday.

Basement Skyscraper Sudoku by Hans van Stippent

PDF

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

Theme: New Variation/Logic

Rules: Standard Sudoku rules. Also, standard Skyscrapers rules. Additionally, the cells in gray are “underground” and cannot be seen for any of the outside skyscraper clues (think of them as starting with a negative sign if necessary). As an example, the 4 in row 2 refers only to seeing four buildings in columns 3 through 7, even if there is a 9 in column 1 or column 2 as that 9 cannot be seen.

Answer String: Enter the 1st row from left to right, followed by a comma, followed by the 9th row from left to right.

Solution: PDF

This is a Melon puzzle. (23 – Sudoku +/- 4)

Sudoku +/- 4 by Palmer Mebane

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between Number entry mode and a shading mode to help track complete clues.)

Theme: Clue Symmetry, and Very Hard WPC Practice

Rules: Variation of Sudoku. Place integers from -4 to 4 into each cell so that each row, column, and region contains each integer from -4 to 4 exactly once. The numbers outside the grid represent the sum of all integers between that clue and the zero in that row/column. Some cells inside the grid already contain an integer but no sign is given. It is part of the puzzle to determine if these values are positive or negative. An example using -2 to 2 from the WPC instructions is here.

Answer String: Enter the numbers (ignoring sign) from left to right in the marked rows, separating each row with a comma (eg “123401234,431023412”).

Time Standards (highlight to view): Grandmaster = 10:00, Master = 16:00, Expert = 32:00

Solution: PDF

Dr. Sudoku Prescribes #144 – Sudoku

Sudoku by Thomas Snyder

PDF

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

Theme: Virginia is for Sudoku Lovers (Note: This puzzle was the final puzzle for this year’s Arlington Puzzle Festival. Congratulations to Erik Agard, Carolyn Offutt, and Jim Spaulding for their 1st/2nd/3rd performance in the tournament.)

Rules: Standard Sudoku rules.

Answer String: Enter the 1st row from left to right, followed by a comma, followed by the 9th row from left to right.

Time Standards (highlight to view): Grandmaster = 2:15, Master = 3:30, Expert = 7:00

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