Your grade is based on the number of moves you made,
 the number that completed a line you were working on, 
 and partial credit for lines that were partially      
 correct.  Your grade is lowered by five points each   
 time you press <F1> for help.  In difficuly mode 3,   
 you must press <F1> at least once to end the game, so 
 the first use is free in that mode only.              
   A grade of 90 or better is excellent; with quizzes  
 marked 'Tough' or 'Killer', you can be proud of grades
 above 75. If you are getting good grades regularly,   
 you might consider trying a higher difficulty mode.   
    PRESS ANY KEY TO CONTINUE.