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Theme: Clue Symmetry and Logic

Author/Opus: This is the 90th puzzle from our contributing puzzlemaster Murat Can Tonta.

Rules: Standard Yajilin rules.

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 = 2:45, Master = 4:00, Expert = 8:00

Note: Follow this link for other classic Yajilin. If you are new to this puzzle type, here are our easiest Yajilin to get started on. More Yajilin puzzles can be found in The Art of Puzzles 2.

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Theme: A Migratory Bird

Author/Opus: This is the 190th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Standard Yajilin rules. Also, enter a number into each gray cell to represent the total number of blackened cells in the given direction. Numbers cannot repeat in a row or column.

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 = 1:45, Master = 3:00, Expert = 6:00

Note: Follow this link for other variations of Yajilin and this link for classic Yajilin. If you are new to this puzzle type, here are our easiest Yajilin to get started on. More Yajilin puzzles can be found in The Art of Puzzles 2.

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Theme: Fourspower

Author/Opus: This is the 189th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: (Hybrid of Fillomino and Snake Puzzles.) 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.

Also see this example:

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 “35522,44462”.

Time Standards (highlight to view): Grandmaster = 3:00, Master = 4:45, Expert = 9:30

Note: Follow these link for other Fillomino or Snake puzzles.

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Theme: Clue Symmetry and Logic

Author/Opus: This is the 256th puzzle from our contributing puzzlemaster Grant Fikes.

Rules: Standard Fillomino rules.

Answer String: For each cell in the marked rows/columns, enter the area of the polyomino it belongs to. Enter just the last digit for any two-digit number. Start with the 6th row, followed by a comma, followed by the 10th row, followed by a comma, followed by the 16th row.

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

Note: Follow this link for other classic Fillomino. If you are new to this puzzle type, here are our easiest Fillomino puzzles to get started on. More Fillomino puzzles can be found in The Art of Puzzles and in Fill o’ Fillomino by Grant Fikes.

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Theme: Antisymmetric Hole

Author/Opus: This is the 186th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Standard Tight Fit Sudoku rules. Also, digits within a grey square must be even and digits within a grey circle must be odd. The range of this puzzle is 1-9.

Answer String: Enter the 2nd row from left to right, followed by a comma, followed by the 5th row from left to right. (Note: for the tight fit cells, enter the top before the bottom as would be normal for the read order.)

Time Standards (highlight to view): Grandmaster = 4:15, Master = 6:00, Expert = 12:00

Note: Follow this link for other Tight Fit Sudoku puzzles on this website. If you are new to this puzzle type, here are our easiest Tight Fit Sudoku to get started on.

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Theme: Four by Four

Author/Opus: This is the 308th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules. Additionally, if a grey circle is given between two adjacent cells, then the two numbers in those cells must be consecutive. (Note: not all grey circles are given; adjacent cells without a circle may contain either consecutive numbers or nonconsecutive numbers.)

Answer String: Enter the 2nd row from left to right, followed by a comma, followed by the 8th row from left to right.

Time Standards (highlight to view): Grandmaster = 2:45, Master = 4:00, Expert = 8:00

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

(Note: puzzles during this bonus week are harder than usual; the four puzzles from Monday-Thursday are all about Thursday or Friday level difficulty.)

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Theme: Maze

Author/Opus: This is the 44th puzzle from our contributing puzzlemaster John Bulten.

Rules: Shade some white cells black so that exactly one of the grid’s clues appears in each contiguous white or black region and indicates the clued region’s area. Circled numbers indicate cells that must remain white.

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. Separate each row’s entry from the next with a comma.

Time Standards (highlight to view): Grandmaster = 4:30, Master = 7:45, Expert = 15:30

Note: Light is John Bulten’s variation of the shading puzzle Light and Shadow, created by Serkan Yürekli. Unlike Light and Shadow, where all numbered cells start white or black, in Light puzzles the numbered cells that are not shaded or circled may be either white or black in the solution.