Merlin's Magic square is an entertaining little program to test
your logic skills. Instructions for play are included on the screen.
The program listing contains plenty of REMarks for you to follow.
Pay particular attention to the inverse spaces required in lines 350
to 370. If you want to change the colour of the screen, alter the
SETCOLOR statement in line 30. Also adding SETCOLOR 1,0,14 will
brighten up the display.