Sudoku · Hard ✓ Solved
Fewer clues; 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
Top players
All leaderboardsSudoku · Hard. Each player’s best score.
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How to play Sudoku
- Fill every empty cell with a number from 1 to 9.
- Each row and each column must contain 1 to 9 once.
- Each of the nine 3×3 boxes must also contain 1 to 9 once.
Full guide with an animated example · Strategy guides · Printable Sudoku
About Hard Sudoku
Fewer clues; needs pairs and pointing. A steady challenge that still never needs guessing on Medium.
Other levels: Beginner · Easy · Medium · Expert
Tips for this level
- Start with the rows, columns and boxes that are nearly full.
- Scan one number at a time across all nine boxes.
- On harder levels, use Notes in every empty cell before looking for pairs.