Author/Opus: This is the 56th puzzle from our contributing puzzlemaster Ashish Kumar.
Rules: Standard Sudoku rules. Also, whenever the digits in two adjacent cells sum to exactly 10 or 5, an X or V is placed on the edge between cells reflecting the roman numerals for 10 or 5. All adjacent cells not marked with an X or V cannot add up to 10 or 5.
Difficulty: 3.5 stars
Time Standards (highlight to view): Grandmaster = 4:00, Master = 7:00, Expert = 14:00