Initialised by the routine at 8684, and used by the routines at 85CC (to hold the index into the message scrolled across the screen after the theme tune has finished playing), 8944 (to hold the distance of the boot from the top of the screen as it descends onto Willy), 8DF8 (to hold Eugene's pixel y-coordinate) and 9135 (to hold the Kong Beast's pixel y-coordinate).