Initialised by the routine at 34436, and used by the routines at 34252 (to hold the index into the message scrolled across the screen after the theme tune has finished playing), 35140 (to hold the distance of the boot from the top of the screen as it descends onto Willy), 36344 (to hold Eugene's pixel y-coordinate) and 37173 (to hold the Kong Beast's pixel y-coordinate).