Classic Sudoku puzzle game
A clean, minimal Sudoku game with four difficulty levels.
Features:
- Four difficulties: Easy, Medium, Hard, Expert
- Notes mode to pencil in candidates
- Hint system (3 hints per game)
- Undo history (up to 30 moves)
- Personal records board per difficulty
- Pause and resume support
- Full keyboard support: numbers, numpad, arrows, N for notes,
Backspace/Delete to erase