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Sudoku Game
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A complete Sudoku with 4 difficulty modes: Easy (38 givens), Medium (30), Hard (24), Expert (18). Click a cell and type 1–9 to fill. Toggle Notes mode for pencil marks. Duplicates highlighted red. Check Solution reveals wrong cells. Up to 3 Hints reveal one unsolved cell each. Timer tracks solve time. Best time per difficulty saved.
How to Use
- 1Select a difficulty (Easy/Medium/Hard/Expert) and click 'New Game'
- 2Click any empty cell to select it, then type a digit 1–9
- 3Toggle 'Notes' mode to enter small pencil marks as candidate numbers
- 4Red cells indicate conflicts - a duplicate in the same row, column, or box
- 5Use 'Check Solution' to find errors, or 'Hint' to reveal one cell (max 3 hints)
Features
- 4 difficulty modes: Easy (38 givens), Medium (30), Hard (24), Expert (18)
- 8 embedded solved grids with pre-computed masks per difficulty
- Notes mode: pencil marks as 3×3 sub-grid candidates per cell
- Conflict highlighting: red background for duplicates in row/col/box
- Check Solution button reveals all wrong cells
- Up to 3 Hints per game (reveals one random unsolved cell each)
- MM:SS timer, starts on first interaction
- Best time per difficulty saved to localStorage
- Arrow key navigation between cells
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