Sudoku XV logic puzzles
Also known as: Sudoku VX
Sudoku XV combines classic Sudoku with 'v' and 'x' Roman numeral markers which indicate that touching pairs of squares sum to either 5 or 10 respectively.
All possible pairs which sum to either 5 or 10 are marked, so if there is no 'v' and no 'x' then two squares do not sum to either 5 or 10.
As with all Sudoku puzzles, there is a unique solution which can be reached via reasonable logical deduction.
Related Sudoku variations (click for details and samples):
Sample Sudoku XV puzzles (click to view press-ready PDF version):
Reasoning & Logic puzzles
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