PDF

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

Theme: Clue Symmetry and Logic

Author/Opus: This is the 108th puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Standard Nurikabe rules. Also there are two windows in the upper left (blue) and lower right (red) of the grid. The cells in the same position in these windows must have the exact opposite shading (see example image).

Answer String: Enter the length in cells of each of the black segments (the unnumbered, connected “ocean”) 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 = 1:40, Master = 2:45, Expert = 5:30

Solution: PDF

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

Tapa (Islands) 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: Clue Symmetry and Logic

Author/Opus: This is the 78th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Standard Tapa rules. Also, unpainted cells form separated areas, “islands”, that contain at most one clue cell. If there is a clue cell in an island, at least one digit of the clue equals the area of the island in cells.

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 = 2:15, 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 key to alternate between line drawing and shading)

Theme: Chinese Whispers

Author/Opus: This is the 76th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Variation of Nurikabe. Shade some empty cells black so that the grid is divided into white areas, each containing at most one number. A white area with a number must have the same area in cells as that number. White areas may only touch diagonally. All shaded cells must be connected with each other, but no 2×2 group of cells can be entirely shaded. Also, all shaded cells must be divisible into snakes with the heads and tails given in the grid. Snakes cannot cross each other.

Also, see this example:

Answer String: Enter the length in cells of each of the black 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 “7,32,31”.

Time Standards (highlight to view): Grandmaster = 2:45, Master = 3:30, Expert = 7:00

Solution: PDF

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

PDF

or solve online (using our beta test of Penpa-Edit tools; use Tab key to alternate between line drawing and shading)

Theme: Odds

Author/Opus: This is the 75th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Variation of Nurikabe. Shade some empty cells black so that the grid is divided into white areas, each containing at most one number. A white area with a number must have the same area in cells as that number. White areas may only touch diagonally. All shaded cells must be connected with each other, but no 2×2 group of cells can be entirely shaded. Also, all shaded cells must be divisible into snakes with the heads and tails given in the grid. Snakes cannot cross each other.

Also, see this example:

Answer String: Enter the length in cells of each of the black 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 “7,32,31”.

Time Standards (highlight to view): Grandmaster = 3:00, Master = 4:00, Expert = 8:00

Solution: PDF

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

PDF

or solve online (using our beta test of Penpa-Edit tools; use Tab key to alternate between line drawing and shading)

Theme: 1, 2, 3

Author/Opus: This is the 74th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Variation of Nurikabe. Shade some empty cells black so that the grid is divided into white areas, each containing at most one number. A white area with a number must have the same area in cells as that number. White areas may only touch diagonally. All shaded cells must be connected with each other, but no 2×2 group of cells can be entirely shaded. Also, all shaded cells must be divisible into snakes with the heads and tails given in the grid. Snakes cannot cross each other.

Also, see this example:

Answer String: Enter the length in cells of each of the black 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 “7,32,31”.

Time Standards (highlight to view): Grandmaster = 2:15, Master = 3:15, Expert = 6:30

Solution: PDF

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

PDF

or solve online (using our beta test of Penpa-Edit tools; use Tab key to alternate between line drawing and shading)

Theme: Clue Symmetry and Logic

Author/Opus: This is the 60th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Variation of Nurikabe. Shade some empty cells black so that the grid is divided into white areas, each containing at most one number. A white area with a number must have the same area in cells as that number. White areas may only touch diagonally. All shaded cells must be connected with each other, but no 2×2 group of cells can be entirely shaded. Also, all shaded cells must be divisible into snakes with the heads and tails given in the grid. Snakes cannot cross each other.

Also, see this example:

Answer String: Enter the length in cells of each of the black 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 “7,32,31”.

Time Standards (highlight to view): Grandmaster = 4:00, Master = 10:00, Expert = 20:00

Solution: PDF

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

PDF

or solve online (using our beta test of Penpa-Edit tools; use Tab key to alternate between line drawing and shading)

Theme: Clue Symmetry and Logic

Author/Opus: This is the 59th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Variation of Nurikabe. Shade some empty cells black so that the grid is divided into white areas, each containing at most one number. A white area with a number must have the same area in cells as that number. White areas may only touch diagonally. All shaded cells must be connected with each other, but no 2×2 group of cells can be entirely shaded. Also, all shaded cells must be divisible into snakes with the heads and tails given in the grid. Snakes cannot cross each other.

Also, see this example:

Answer String: Enter the length in cells of each of the black 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 “7,32,31”.

Time Standards (highlight to view): Grandmaster = 3:30, Master = 4:45, Expert = 9:30

Solution: PDF

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