PDF

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

Theme: Stacked Boxes

Author/Opus: This is the 168th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Thermo-Sudoku rules.

Answer String: Enter the 1st row from left to right, followed by a comma, followed by the 6th row from left to right.

Time Standards (highlight to view): Grandmaster = 4:15, Master = 5:15, Expert = 10:30

Solution: PDF

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.

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.

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to shift between shading mode and the composite Yajilin mode where left click marks cells, right click marks dots in cells or X’s on edges, left click+drag draws lines.)

Theme: Symmetry and Border Pattern

Author/Opus: This is the 33rd puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Standard Tapa rules. Also, if two cells are separated by a thick border, this means that exactly one of those cells is shaded and the other is unshaded.

Answer String: Enter the length in cells of each of the shaded segments from left to right for the marked rows, starting at the top. Separate each row’s entry from the next with a comma.

Time Standards (highlight to view): Grandmaster = 2:45, Master = 3:45, Expert = 7:30

Solution: PDF

Note: Follow this link for other Tapa variations and this link for classic Tapa. If you are new to this puzzle type, here are our easiest Tapa puzzles to get started on.

PDF

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

Theme: Clue symmetry and logic

Author/Opus: This is the 32nd puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Variation of Masyu rules. In addition to the standard rules, some white circles may be shaded to become black circles.

Answer String: Enter the length in cells of the horizontal loop segments from left to right in the marked rows, starting at the top. If the loop only has vertical segments in the marked row, enter 0. Separate each row’s entry with a comma.

Time Standards (highlight to view): Grandmaster = 3:00, Master = 3:45, Expert = 7:30

Solution: PDF

Note: Follow this link for other Masyu variations and this link for classic Masyu. If you are new to this puzzle type, here are our easiest Masyu to get started on.

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: Quadrants

Author/Opus: This is the 14th puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Combination of Slitherlink and Masyu rules.

Specifically, draw a single closed loop by connecting neighboring dots horizontally or vertically so that each number represents the number of adjacent edges used by the loop. The loop passes through all large circles. It must go straight through the white circles with at least one side turning at the next dot; it must turn at the black circles and then go straight through the next dot in both directions.

Answer String: Enter the length in cells of each of the internal loop segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma.

Time Standards (highlight to view): Grandmaster = 1:40, Master = 2:30, Expert = 5:00

Solution: PDF

Note: Follow these links for other Slitherlink variations and Masyu variations. Or follow these links for classic Slitherlink and classic Masyu puzzles.

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: Diagonal Series

Author/Opus: This is the 163rd puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Cave rules.

Answer String: Enter the length in cells of each of the cave segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma.

Time Standards (highlight to view): Grandmaster = 3:30, Master = 5:45, Expert = 11:30

Solution: PDF; a solution video is available here.

Note: Follow this link for other classic Caves. If you are new to this puzzle type, here are our easiest Cave Puzzles to get started on.

PDF

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

Theme: P is for Prime

Author/Opus: This is the 90.5th* puzzle from our contributing puzzlemaster Grant Fikes. (*we enumerated wrong a long time ago and can’t fully adjust now)

Rules: Standard TomTom rules, using the indicated set of integers {2,3,5,7,11,13}.

Answer String: Enter the 3rd row from left to right, followed by a comma, followed by the 5th row from left to right. Use both digits for any two digit numbers (for instance “23571113,…”)

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

Solution: PDF

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

PDF

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

Theme: Knight Moves

Author/Opus: This is the 90th puzzle from our contributing puzzlemaster Grant Fikes.

Rules: Standard Kurotto rules.

Answer String: Enter the length in cells of each of the shaded segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma.

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

Solution: PDF

Note: This is our first week of Kurotto puzzles. Follow this link for other Kurotto puzzles. If you are new to this puzzle type, here are our easiest Kurotto to get started on.

PDF

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

Theme: Four Squares

Author/Opus: This is the 29th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Standard Kurotto rules.

Answer String: Enter the length in cells of each of the shaded segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma.

Time Standards (highlight to view): Grandmaster = 1:20, Master = 2:15, Expert = 4:30

Solution: PDF

Note: This is our first week of Kurotto puzzles. Follow this link for other Kurotto puzzles. If you are new to this puzzle type, here are our easiest Kurotto to get started on.

PDF

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

Theme: Heart-Shaped Box

Author/Opus: This is the 160th puzzle from Thomas Snyder aka Dr. Sudoku.

Rules: Standard Isodoku rules, using numbers 1-8.

Answer String: Enter the 5th “row” from left to right, followed by a comma, followed by the 8th “row” from left to right.

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

Solution: PDF

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