GShisen is the first GNUstep game!
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.