shisen.app 1.2.1-1build4 (i386 binary) in ubuntu quantal

 The object of the game is to remove all tiles from the field. Only two
 matching tiles can be removed at a time. Two tiles can only be removed
 if they can be connected with at most three connected lines. Lines can
 be horizontal or vertical but not diagonal. Remember that lines may
 cross the empty border. If you are stuck, you can use the Hint feature
 to find two tiles which may be removed.