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← SUDOKU COLLECTION
METAL / VARIANT

XV Sudoku

X marks ten, V marks five.

Click a cell, then a digit. Arrow keys move, 1–9 place, Backspace clears.

Rules

An X between two cells means those digits add up to 10. A V means they add up to 5. Everything else is ordinary sudoku — in this version only the marked pairs are constrained.

  • X: the pair sums to 10.
  • V: the pair sums to 5.
  • Unmarked adjacent pairs have no constraint.
  • Only 1-4 and 2-3 make five, so a V is a strong clue for low digits.

Good to know

Ordinary sudoku rules still apply underneath the variant: every row, column and 3×3 box holds 1–9 exactly once. The extra rule sits on top and is usually what breaks the puzzle open.

More sudoku

All sudoku variants ↗

Or read how to play Sudoku ↗.