NoNo Nine

NoNo Nine is a modern Sudoku app for beginners and experienced puzzle players. Play classic 9x9 Sudoku or choose a faster 6x6 puzzle.
Select from five difficulty levels: Beginner, Easy, Medium, Hard, and Expert. Every puzzle is randomly generated and has exactly one valid solution.
Features:
- Classic 9x9 and compact 6x6 Sudoku
- Five difficulty levels
- Automatically saved game progress
- Undo, erase, notes, and hints
- Automatic mistake checking
- Light and dark themes
- Local statistics and personal records
- Google Play Games sign-in and achievements
- Online leaderboards by game type and difficulty
- Compare fastest times and highest scores
- English and Dutch language support
Completed games can be submitted to the online leaderboard. Scores are based on difficulty, completion time, hints used, and mistakes made. Games played with automatic notes enabled are excluded from the leaderboard.
Train your focus, improve your fastest times, and unlock Google Play Games achievements with NoNo Nine.