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Author/Opus: This is the 12th puzzle from guest contributor Swaroop Guggilam.
Rules: Standard Even/Odd Sudoku rules (i.e., cells with a square contain an even digit; cells with a circle contain an odd digit).
Difficulty: 3 stars
Time Standards (highlight to view): Grandmaster = 3:30, Master = 5:15, Expert = 10:30
Note: Follow this link for more Even/Odd Sudoku puzzles. If you are new to this puzzle type, here are our easiest Even/Odd Sudoku to get started on. More Even/Odd Sudoku puzzles can be found in The Art of Sudoku 2.