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