Simple Sudoku

This Sudoku application is a simple implementation of the original Japanese game.
This is a Beta version.

It offers
* an unlimited amount of games in 5 difficulty levels,
* statistics,
* hints about inserted numbers,
* and ability to look at all mistakes after the game is over.

If you encounter any problem while playing or if you have ideas for improving the application, please contact me by e-mail: butterflyrobotandroid@gmail.com