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: Triples
Rules: Standard Slitherlink rules.
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 = 0:45, Master = 1:30, Expert = 3:00
Solution: PDF
or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between a composite mode for line/edge drawing and a number entry mode.)
Theme: Rough Diamond, or Diamond in the Rough?
Rules: Standard Fillomino rules.
Answer String: For each cell in the marked rows/columns, enter the area of the polyomino it belongs to. Start with the 9th row, followed by a comma, followed by the 6th column.
Time Standards (highlight to view): Grandmaster = 2:45, Master = 4:00, Expert = 8:00
Solution: PDF
Note: Follow this link for other classic Fillomino and this link for more variations on Fillomino puzzles. If you are new to this puzzle type, here are our easiest Fillomino puzzles to get started on.
or solve online (using our beta test of Penpa-Edit tools)
Theme: Missing my Rubik’s? This isodoku has 27 fewer “cubes” than Monday’s puzzle.
Rules: Standard Isodoku rules, using numbers 1-8.
Answer String: Enter the 1st “row” on the left edge, followed by a comma, followed by the 2nd “row” on the left edge.
Time Standards (highlight to view): Grandmaster = 2:15, Master = 4:15, Expert = 8:30
Solution: PDF
or solve online (using our beta test of Penpa-Edit tools)
Theme: Double Diagonals
Rules: Standard Surplus Sudoku rules, with numbers from 1-8.
Answer String: Enter the 4th row from left to right, followed by a comma, followed by the 5th row from left to right.
Time Standards (highlight to view): Grandmaster = 1:45, Master = 2:45, Expert = 5:30
Solution: 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: All for One and One for All
Rules: Standard Slitherlink rules.
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 = 3:00, Master = 5:00, Expert = 10:00
Solution: PDF
or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between number placement, ship placement, and shading modes. The shading mode in gray, which numbers can be written on top of, may work better than default ship placement.)
Theme: Four Islands
Rules: Standard Battleship Sudoku rules.
Answer String: Enter the 8th row from left to right, followed by a comma, followed by the 6th column from top to bottom.
Time Standard: Battleship Sudoku Grandmaster = 5:30, Master = 8:00, Expert = 16:00
Solution: PDF
Note: Advice on solving this puzzle has now been posted in “Ask Dr. Sudoku #8“
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: Just Try Two Find Us
Rules: Standard Battleships rules.
Answer String: For each row from top to bottom, enter the number of the first column from the left where a ship segment appears. If the row is empty, enter 0. Enter these numbers as a single string with no separators.
Time Standard: Battleships Grandmaster = 1:45, Master = 2:45, Expert = 5:30
Solution: PDF
or solve online (using our beta test of Penpa-Edit tools)
Theme: Happy Valentine’s Day – a heart of given numbers inside a heart-shaped grid.
Rules: Standard Sudo-Kurve rules.
Answer String: Enter the “row” marked A, followed by a comma, followed by the “row” marked B.
Time Standard: Sudo-Kurve Grandmaster = 4:00, Master = 6:15, Expert = 12:30
Solution: 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: Greek Cross
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 Standard: Tapa Grandmaster = 1:30, Master = 4:30, Expert = 9:00
Editorial Note: The solving path on this puzzle is quite narrow to start, but it is recommended that you find it instead of randomly guessing.
Solution: PDF
or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between Sudoku entry modes and a shading mode to mark off clues.)
Theme: A series of series (and a constant and a square) — The seemingly random numbers outside the grid actually have some rhyme and reason.
Rules: Standard Outside Sudoku rules.
Answer String: Enter the 7th row from left to right, followed by a comma, followed by the 4th column from top to bottom.
Time Standard: Outside Sudoku Grandmaster = 5:00, Master = 7:00, Expert = 14:00
Solution: PDF