A great option to get hold of free sudokus and also have the possibility to score points and take part in an online leaderboard with players from all over the world is by means of the Game Center on your iPhone. Sudoku Finger Arts is a sudoku app with a rather appealing interface and, despite being a simple game, it's a totally configurable application, being able to modify values such as the melody, sound effects, game actions such as the automatic removal of notes, automatic selection of squares, highlighting of notes, score comparisons...
On the other hand, you can also modify what you see on the screen, such as the top bar, where you can view or hide your battery level, view or hide tabs or change their size, view or hide the time, and disable the Game Center if you don't want to access the online mode.
A sudoku with an online leaderboard system.
Can I change the difficulty?
There's no need to be an expert in the art of doing sudokus. The app comes along with levels for all kinds of users. Therefore, once you start a game, simply choose the difficulty level which will also affect the length of the game you're about to start. The levels available are the following:
Finally, you can resume the latest game you left unfinished. Once you've started a sudoku, from the pencil icon, you can change between the real mode or the notes mode. As you can see, quite a complete and free app to do sudokus.