Load File: tetris.sml
  
  To play from inside MLWorks, at the listener prompt type 

    test ();

  or 
  	
    tetris ("Your Name", <level number>);
  
  where <level number> is an integer from 1 to 5 inclusive, and "Your
  Name" is your name as you want it to appear in the high-score table.
  The high-score table is written to a file `highscores.tet' which is 
  re-loaded when the game is run again, or, if the file cannot be
  found a new file is created.
  
  Controls for the game are:
  
        S   start / restart

  	l   move piece right
  	h   move piece left
  	i   rotate piece anticlockwise
  	o   rotate piece clockwise
  
  	<space> (hold down)  move piece down more quickly
  
  	X   quit
  	

  To run as a standalone executable first compile and load the
  module as usual using the project workspace.  Then create an
  executable file, for instance by doing

    MLWorks.Deliver.deliver ("tetris",appl("Me",4),MLWorks.Deliver.WINDOWS);

  (appl("Me",4) is a function of type unit -> unit which allows
  the demo to be run without invoking MLWorks).  After delivery,
  the MLWorks session will exit.  The file `tetris.exe' can then be 
  run from the command-line.  
  
  Note that MLWorks executables depend on the MLWorks runtime shared
  library (DLL).  If the DLL cannot be found, either add the bin
  subdirectory of the current directory to your path environment
  variable, or run the executable from either the bin directory or the
  directory in which it is located.