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.