❌ XV Sudoku

In XV Sudoku, an X between two squares means they sum to 10; a V means they sum to 5. If there's no mark, they sum to neither 5 nor 10.

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📖 How to play XV Sudoku

  1. The sudoku rules apply: 1 through 9 with no repeats in each row, column, and 3x3 box.
  2. An X between two neighboring squares means their numbers sum to 10 (for example 6 and 4).
  3. A V means they sum to 5 (for example 2 and 3). Remember: X is worth 10 and V is worth 5 in Roman numerals.
  4. Important: if there's no mark between two neighbors, they sum to neither 5 nor 10. Each puzzle has a unique solution.

💡 Tip: a V can only be formed with 1+4 or 2+3, so V marks are very restrictive. The absence of a mark also rules out certain pairs.

📖 Want to master it? Read the full guide: How to play XV Sudoku: rules and tricks.