diff --git a/mist/generator_puzzle.s b/mist/generator_puzzle.s
index a99c0b13..babf99f1 100644
--- a/mist/generator_puzzle.s
+++ b/mist/generator_puzzle.s
@@ -111,6 +111,14 @@ done_turn_on_breaker:
 
 open_gen_door:
 
+	lda	gen_door_status
+	eor	#$1
+	sta	gen_door_status
+
+	beq	gen_close_door
+
+gen_open_door:
+
 	ldy	#LOCATION_NORTH_EXIT
 	lda	#GEN_GENERATOR_ROOM
 	sta	location3,Y			; GEN_GENERATOR_DOOR
@@ -125,10 +133,32 @@ open_gen_door:
 	lda	#>gen_door_open_n_lzsa
 	sta	location3+1,Y			; GEN_GENERATOR_DOOR
 
-	jsr	change_location
+	jmp	change_location
 
-	rts
+gen_close_door:
 
+	; disable exit
+	ldy	#LOCATION_NORTH_EXIT
+	lda	#$ff
+	sta	location3,Y			; GEN_GENERATOR_DOOR
+
+	ldy	#LOCATION_NORTH_EXIT_DIR
+	lda	#$ff
+	sta	location3,Y			; GEN_GENERATOR_DOOR
+
+	; change background
+
+	ldy	#LOCATION_NORTH_BG
+	lda	#<gen_door_closed_n_lzsa
+	sta	location3,Y			; GEN_GENERATOR_DOOR
+	lda	#>gen_door_closed_n_lzsa
+	sta	location3+1,Y			; GEN_GENERATOR_DOOR
+
+	jmp	change_location
+
+
+gen_door_status:
+	.byte	$00	; closed
 
 button_lookup:
 .byte $10,$8,$4,$2,$1
diff --git a/mist/graphics_dni/atrus_desk.png b/mist/graphics_dni/atrus_desk.png
index 9f3ec53d..af8d4e95 100644
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diff --git a/mist/graphics_mist/spaceship_far_n.png b/mist/graphics_mist/spaceship_far_n.png
index 3dd2df0c..97a258ff 100644
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diff --git a/mist/graphics_sprite/sprites.png b/mist/graphics_sprite/sprites.png
index bc93b9ed..3c32ee75 100644
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diff --git a/mist/graphics_sub/sub_animations.png b/mist/graphics_sub/sub_animations.png
index 3ededf2b..866854da 100644
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diff --git a/mist/mist.dsk b/mist/mist.dsk
index 18b99e67..67f8e439 100644
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diff --git a/mist/mist_side3.dsk b/mist/mist_side3.dsk
index 324c096a..7b57a507 100644
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