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Diagonal Sudoku · Hard ✓ Solved

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Needs pairs and pointing.

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Keyboard shortcuts
  • Arrow keys: move around the grid
  • Number keys: enter a number
  • Backspace or Delete: erase
  • N: notes on/off
  • Ctrl+Z / Ctrl+Y: undo / redo
  • H: hint

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How to play Diagonal Sudoku

  1. Each row, column and 3×3 box contains 1 to 9 once.
  2. Both long diagonals (corner to corner) also contain 1 to 9 once.
  3. Every puzzle has exactly one solution.

Full guide with an animated example · Strategy guides · Printable Diagonal Sudoku

About Hard Diagonal Sudoku

Needs pairs and pointing. A steady challenge that still never needs guessing on Medium.

Other levels: Easy · Medium · Expert

Tips for this level

  • Check the diagonals early: they often hide a single.
  • The center box touches both diagonals.

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