Saper (Minesweeper) description

In this version of the well-known game , you have three levels of difficulty, similar to those in Windows version of this game.
Although the sizes of the mine fields are different then those in the just stated OS in order to take into account the resolutions of the screens of Android devices (mostly 480 X 800), approximately the same ratio of mines/(number of squares) was kept in respective diffitulty levels.
The graphics is not revolutionary as well in order to appeal to Windows version sentiments.
Enjoy!
Note: this version may not be bug free, so any constructive feedback will be appreciated.