Krakout: Award a bonus life when the score passes a milestone

B5FB: Award a bonus life when the score passes a milestone

Grants one extra life each time the score's ten-thousands digit advances, so one per 10000 points.
A marker byte holds the score's ten-thousands digit as of the last award. Any change copies the live digit over the marker and awards one life.
award_score_life	B5FB	LD A,(score_milestone_marker)	No new milestone while the score's ten-thousands digit still matches the saved marker.
	B5FE	LD HL,score_ten_thousands
	B601	CP (HL)
	B602	RET Z
	B603	LD A,(HL)	Record the new digit so this milestone is awarded only once.
	B604	LD (score_milestone_marker),A
	B607	JR gain_life

Routines