Sudoku Extra

You can choose from 4 difficulty levels: Easy, Medium, Hard, Very Hard.
2. The game saves automatically so you don't have to worry if you close the app or your battery runs out.
3. Use the notes to write down possible solutions.
4. You can delete notes or mistakes with the Erase button.
5. Can change symbols for more fun and challenge. There are 16 categories to try out. You can unlock symbols with 100 coins. Each game you win gives you 25 coins.
6. The Get Hint function gives you an extra solved square in the grid.
7. There is a clock to track your solving time.
8. You can pause the game at any time.
9. You can mute the sounds.
10. More than 2000 puzzles to solve.