Theme: Big X
Author/Opus: This is the 361st 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.)
Difficulty: 2.5 stars
Time Standards (highlight to view): Grandmaster = 2:20, Master = 3:30, Expert = 7:00