You can save the current state of the game by pressing the left mouse button on
the ``save game'' button. xsok will try to create a file in the
directory /var/games/xsok with its name
consisting of the name of the level subset, the level number, and the extension
.sv.
If you solve a level and break the highscore, the game is saved automatically.
There are three different file extensions: .bs for best score,
.mp for minimal number of pushes, and .mm for minimal number of moves. If some of them are identical, links will be used
to save disk space.