XV Sudoku by Ashish Kumar
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Author/Opus: This is the 56th puzzle from our contributing puzzlemaster Ashish Kumar.
Rules: Standard Sudoku rules. Also, whenever the numbers 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
Solution: PDF; a solution video is also available here.
Note: Follow this link for other variations of Sudoku and this link for classic Sudoku. If you are new to this puzzle type, here are our easiest Sudoku to get started on.
Great puzzle! With a solving path that was clear but narrow, it was like a little treasure hunt finding the next deduction at each step.