diff --git a/games/keen/keen_mars.s b/games/keen/keen_mars.s
index 58b7ed1c..0715613d 100644
--- a/games/keen/keen_mars.s
+++ b/games/keen/keen_mars.s
@@ -123,6 +123,15 @@ keen_loop:
 	inc	FRAMEH
 no_frame_oflo:
 
+	lda	FRAMEL
+	lsr
+	lsr
+	lsr
+	and	#$7
+	tay
+	lda	star_colors,Y
+	sta	$F28			; 0,28
+
 	;===========================
 	; check end of level
 	;===========================
@@ -599,3 +608,9 @@ maybe_exit:
 	inc	LEVEL_OVER
 
 	rts
+
+
+
+star_colors:
+	.byte $05,$07,$07,$0f
+	.byte $0f,$07,$05,$0a
diff --git a/games/keen/zp.inc b/games/keen/zp.inc
index 5d3c3036..b5f5d821 100644
--- a/games/keen/zp.inc
+++ b/games/keen/zp.inc
@@ -151,6 +151,8 @@ LONG_FRAME	=	$E4	; nibel
 CURRENT_DISPLAY	=	$E4	; selena
 LAST_PLAYED	=	$E4	; selena
 
+STAR_CYCLE	=	$E5
+
 DISP_PAGE	=	$ED	; ALL
 DRAW_PAGE	=	$EE	; ALL