diff --git a/games/keen/mars.s b/games/keen/mars.s
index e6084cd0..ba6e108c 100644
--- a/games/keen/mars.s
+++ b/games/keen/mars.s
@@ -42,23 +42,9 @@ plenty_of_keens:
 	sta	FRAMEL
 	sta	FRAMEH
 
-	sta	KEEN_WALKING
-	sta	KEEN_JUMPING
-;	sta	LEVEL_OVER
-	sta	LASER_OUT
-	sta	KEEN_XL
-	sta	KEEN_FALLING
-	sta	KEEN_SHOOTING
-
-
 	lda	#4
 	sta	DRAW_PAGE
 
-;	lda	#18
-;	sta	KEEN_X
-;	lda	#11
-;	sta	KEEN_Y
-
 	; see if returning and it game over
 
 	lda	LEVEL_OVER
@@ -224,53 +210,33 @@ return_to_title:
 	;=========================
 	; draw keen
 	;=========================
-	; D32
+
 draw_keen:
 
-	lda	MARS_Y
-	and	#1
-	beq	draw_keen_even
-
-draw_keen_odd:
-
-	; calculate address of MARS_Y/2
-
-	lda	MARS_Y
-	and	#$FE
-	tay
-	lda	gr_offsets,Y
-	sta	OUTL
-	lda	gr_offsets+1,Y
+	sec
+	lda	MARS_TILEX
+	sbc	TILEMAP_X
+	asl
 	clc
-	adc	DRAW_PAGE
-	sta	OUTH
+	adc	MARS_X
+	sta	XPOS
 
-	ldy	MARS_X
-
-	lda	(OUTL),Y
-	and	#$0f
-	ora	#$D0
-	sta	(OUTL),Y
-
-	lda	MARS_Y
+	sec
+	lda	MARS_TILEY
+	sbc	TILEMAP_Y
+	asl
+	asl
 	clc
-	adc	#2
+	adc	MARS_Y
+	sta	YPOS
 
-	and	#$FE
-	tay
-	lda	gr_offsets,Y
-	sta	OUTL
-	lda	gr_offsets+1,Y
-	clc
-	adc	DRAW_PAGE
-	sta	OUTH
+	ldx	#<keen_sprite_tiny
+	lda	#>keen_sprite_tiny
+	stx	INL
+	sta	INH
+	jsr	put_sprite_crop
 
-	ldy	MARS_X
-
-	lda	#$23
-	sta	(OUTL),Y
-
-	rts
+	rts				; tail call
 
 
 
@@ -482,7 +448,7 @@ parts_zx02:
 
 	.include	"mars_sfx.s"
 	.include	"longer_sound.s"
-
+	.include	"gr_putsprite_crop.s"
 
 mars_data_zx02:
 	.incbin	"maps/mars_new.zx02"
@@ -490,3 +456,9 @@ mars_data_zx02:
 	; dummy
 enemy_data_out:
 enemy_data_tilex:
+
+
+keen_sprite_tiny:
+	.byte	1,2
+	.byte	$DA
+	.byte	$23
diff --git a/games/keen/mars_keyboard.s b/games/keen/mars_keyboard.s
index 00f31dce..92b3c4f3 100644
--- a/games/keen/mars_keyboard.s
+++ b/games/keen/mars_keyboard.s
@@ -1,3 +1,5 @@
+MAX_TILE_Y = 57		; 69-12
+
 	;==============================
 	; Handle Keypress
 	;==============================
@@ -200,12 +202,45 @@ check_up:
 	bne	check_down
 
 up_pressed:
-	ldy	MARS_X
-	ldx	MARS_Y
-	dex
-	jsr	check_valid_feet
-	bcc	done_up_pressed
-	dec	MARS_Y
+	lda	MARS_TILEY
+	cmp	#0		; not needed
+	beq	move_keen_up
+
+	sec
+	lda	TILEMAP_Y
+	sbc	MARS_TILEY
+
+	cmp	#4
+	bcc	scroll_keen_up
+
+move_keen_up:
+
+	lda	MARS_Y
+	beq	keen_up_not2
+move_keen_up2:
+	lda	#0
+	sta	MARS_Y
+	jmp	done_check_up
+
+keen_up_not2:
+	dec	MARS_TILEY
+	lda	#2
+	sta	MARS_Y
+	jmp	done_check_up
+
+scroll_keen_up:
+	dec	TILEMAP_Y
+	dec	MARS_TILEY
+	jsr	copy_tilemap_subset
+
+
+;	ldy	MARS_X
+;	ldx	MARS_Y
+;	dex
+;	jsr	check_valid_feet
+;	bcc	done_up_pressed
+;	dec	MARS_Y
+done_check_up:
 done_up_pressed:
 	jmp	done_keypress
 
@@ -215,12 +250,41 @@ check_down:
 	cmp	#$0A
 	bne	check_space
 down_pressed:
-	ldy	MARS_X
-	ldx	MARS_Y
-	inx
-	jsr	check_valid_feet
-	bcc	done_up_pressed
-	inc	MARS_Y
+
+	sec
+	lda	MARS_TILEY
+	sbc	TILEMAP_Y
+	cmp	#8
+	bcc	move_keen_down
+
+	lda	TILEMAP_Y
+	cmp	#MAX_TILE_Y
+	bcs	move_keen_down
+
+	jmp	scroll_keen_down
+
+move_keen_down:
+
+	lda	#0
+	sta	MARS_Y
+	inc	MARS_TILEY
+	jmp	done_check_down
+
+scroll_keen_down:
+	lda	#0
+	sta	MARS_Y
+	inc	TILEMAP_Y
+	inc	MARS_TILEY
+	jsr	copy_tilemap_subset
+
+;	ldy	MARS_X
+;	ldx	MARS_Y
+;	inx
+;	jsr	check_valid_feet
+;	bcc	done_up_pressed
+;	inc	MARS_Y
+done_check_down:
+
 done_down_pressed:
 	jmp	done_keypress