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Author/Opus: This is the 238th 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 4th 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 = 1:40, Master = 2:45, Expert = 5:30