Theme: S is for Sudoku
Author/Opus: This is the 187th puzzle from our contributing puzzlemaster Serkan Yürekli.
Rules: Standard Sudoku rules.
Answer String: Enter the 1st row from left to right, followed by a comma, followed by the 9th row from left to right.
Time Standards (highlight to view): Grandmaster = 4:15, Master = 6:30, Expert = 13:00