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Theme: Alternating Stripes (Originally on 2017 Brand’s Sudoku Open)

Author/Opus: This is the 166th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Standard Sudoku rules. Also, cells with a square contain an even digit; cells with a circle contain an odd digit.

Answer String: Enter the 5th row from left to right, followed by a comma, followed by the 4th column from top to bottom.

Time Standards (highlight to view): Grandmaster = 3:45, Master = 6:00, Expert = 12:00

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.

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Theme: Half Full

Author/Opus: This is the 6th puzzle from guest contributor Swaroop Guggilam.

Rules: Standard Sudoku rules. Also, digits in circles must be odd and digits in squares must be even.

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 = 7:45, Master = 10:30, Expert = 21:00

Note: Follow this link for other Even/Odd Sudoku. Follow this link for classic Sudoku.

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Theme: Bull’s-Eye

Author/Opus: This is the 218th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules. Also, digits in circles must be odd and digits in squares must be even.

Answer String: Enter the 2nd row from left to right, followed by a comma, followed by the 7th row from left to right.

Time Standards (highlight to view): Grandmaster = 9:00, Master = 21:00, Expert = 42:00

Note: Follow this link for other Even/Odd Sudoku. Follow this link for classic Sudoku.

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Theme: Ring Cycle

Author/Opus: This is the 217th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules. Also, digits in circles must be odd and digits in squares must be even.

Answer String: Enter the 1st row from left to right, followed by a comma, followed by the 5th row from left to right.

Time Standards (highlight to view): Grandmaster = 4:15, Master = 6:30, Expert = 13:00

Note: Follow this link for other Even/Odd Sudoku. Follow this link for classic Sudoku.

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Theme: Boxed In

Author/Opus: This is the 216th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules. Also, digits in circles must be odd and digits in squares must be even.

Answer String: Enter the 2nd row from left to right, followed by a comma, followed by the 5th row from left to right.

Time Standards (highlight to view): Grandmaster = 0:45, Master = 1:20, Expert = 2:40

Note: Follow this link for other Even/Odd Sudoku. Follow this link for classic Sudoku.

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Theme: Two-Sided Problem

Author/Opus: This is the 187th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules. Also, digits in circles must be odd and digits in squares must be even.

Answer String: Enter the 4th row from left to right, followed by a comma, followed by the 2nd column from top to bottom.

Time Standards (highlight to view): Grandmaster = 3:45, Master = 8:00, Expert = 16:00

Note: Follow this link for other less common variations of Sudoku. Many specific variations of Sudoku have their own categories in the sidebar to the left. Follow this link for classic Sudoku.

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Theme: Parity Groups

Author/Opus: This is the 167th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Sudoku rules. Also, digits in circles must be odd and digits in squares must be even.

Answer String: Enter the 3rd row from left to right, followed by a comma, followed by the 7th row from left to right.

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

Note: Follow this link for other less common variations of Sudoku. Many specific variations of Sudoku have their own categories in the sidebar to the left. Follow this link for classic Sudoku.