Theme: Nothing in the Middle
Author/Opus: This is the 1st puzzle from guest contributor Akash Doulani.
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 3rd row from left to right, followed by a comma, followed by the 6th row from left to right.
Time Standards (highlight to view): Grandmaster = 3:00, Master = 4:45, Expert = 9:30