Yajisan Kazusan by Thomas Snyder

Yajisan Kazusan by Thomas Snyder

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Theme: X’s and O’s (for Jamie Hargrove)

Author/Opus: This is the 291st puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Shade some cells black so that all unshaded number and arrow clues indicate the exact count of shaded cells in the given direction. Shaded cells cannot share an edge, and all white cells must remain connected as part of a single contiguous group. It is allowed to shade over some of the numbered cells; a shaded over clue may or may not be true.

Also, see this example:

Yajisan Kazusan by Thomas Snyder

Answer String: For each row from top to bottom, enter the number of shaded cells as a single string. For the example, the answer is “20212”.

Time Standards (highlight to view): Grandmaster = 2:30, Master = 4:30, Expert = 9:00

Note: Follow this link for other less common Shading puzzles.

Numberlink by Thomas Snyder

Numberlink by Thomas Snyder

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Theme: Clue Symmetry and Logic (for TheSubro)

Author/Opus: This is the 290th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Connect each pair of identical numbers with a path passing through edge-adjacent cells. No cell may be used on more than one path.

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

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

Note: Follow this link for other Loop/Path puzzles.

Sudoku by Thomas Snyder

Sudoku by Thomas Snyder

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Theme: Four Loops (Originally for the 2017 Arlington Puzzle Festival)

Author/Opus: This is the 284th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules.

No answer string (just click “solve”).

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

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.

Sudoku by Thomas Snyder

Sudoku by Thomas Snyder

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Theme: Fireworks (Originally for Diwali/WSC Sudoku Talk)

Author/Opus: This is the 282nd puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules.

No answer string (just click “solve”).

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

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.

Sudoku by Thomas Snyder

Sudoku by Thomas Snyder

PDF

Theme: Candles (Originally for Diwali/WSC Sudoku Talk)

Author/Opus: This is the 281st puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules.

No answer string (just click “solve”).

Time Standards (highlight to view): Grandmaster = 1:50, Master = 3:15, Expert = 6:30

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.

Snake Pit X by Takeya Saikachi

Snake Pit by Takeya Saikachi

PDF

Theme: X Box

Author/Opus: This is the 2nd puzzle from guest contributor Takeya Saikachi.

Rules: Divide the grid along the boundary lines so that every cell belongs to a snake. A snake is a one-cell-wide path at least two cells long that does not touch itself, not even diagonally. Circled cells must be at one of the ends of a snake. A snake may contain one circled cell, two circled cells, or no circled cells at all. Numbered cells must be part of a snake with a length of exactly that number of cells. A snake may contain one number, multiple identical numbers, or no numbers at all. Two snakes of the same length cannot touch each other horizontally or vertically. Cells with an X cannot be an end of a snake.

Also see this example:

Snake Pit

Answer String: For each cell in the marked rows/columns, enter the length of the snake it belongs to. Enter just the last digit for any two-digit number. This example has the key “33553,44664”.

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

Note: Follow this link for other Snake puzzles.

Sunglasses by Eden

Sunglasses by Eden

PDF

Theme: Logical

Author/Opus: This is the 1st puzzle from guest contributor Eden.

Rules: Shade some cells to make sunglasses. The sunglasses consist of a bridge (a given line, in red) and two lenses made out of orthogonally connected black cells that are symmetric with respect to the perpendicular bisector of the bridge. Two lenses may not share an edge, but can intersect at a point. Cells with the bridges are not shaded, except at the bridge ends. The numbers on the right and bottom edges of the grid indicate the number of shaded lens cells in that row or column.

Also see this example:

Sunglasses

Answer String: Enter the length in cells of each of the black lens segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma. This example has the key “22,121,12”.

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

Note: Follow this link for other shading puzzles.