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