Theme: Four by Four
Author/Opus: This is the 308th puzzle from Thomas Snyder, aka Dr. Sudoku.
Rules: Standard Sudoku rules. Additionally, if a grey circle is given between two adjacent cells, then the two numbers in those cells must be consecutive. (Note: not all grey circles are given; adjacent cells without a circle may contain either consecutive numbers or nonconsecutive numbers.)
Answer String: Enter the 2nd row from left to right, followed by a comma, followed by the 8th row from left to right.
Time Standards (highlight to view): Grandmaster = 2:45, Master = 4:00, Expert = 8:00