On the title screen, hold down 'L SHIFT', 'R SHIFT', 'L ALT', and
        'R ALT' to bring up the music select screen.  On the title screen
        hold down 'E', 'A', 'S', and 'Y'.  Now during play press '=' To
        advance levels and press '-' to go back levels.  To deactivate the
        cheat hold down 'H', 'A', 'R', and 'D' on the title screen.