diff --git a/mist/TODO b/mist/TODO
index 9f0cca74..22a22b77 100644
--- a/mist/TODO
+++ b/mist/TODO
@@ -30,7 +30,7 @@ Marker Switches (8):
 + * Spaceship
 + Clock
 + Cabin
-+ Generator
++ * Generator
 
 Fireplace:
 + 8x6 grid
@@ -39,7 +39,7 @@ Fireplace:
 
 16 more pictures?
 + cabin switch
-+ generator switch
++ * generator switch
 + close-in clock
 + clock with gears up
 + clock switch
diff --git a/mist/graphics_island/Makefile b/mist/graphics_island/Makefile
index 82b6f28e..0e98e463 100644
--- a/mist/graphics_island/Makefile
+++ b/mist/graphics_island/Makefile
@@ -34,7 +34,8 @@ mist_graphics.inc:	\
 	gear_n.lzsa gear_w.lzsa gear_s.lzsa \
 	gear_base_n.lzsa \
 	dentist_door_n.lzsa dentist_door_s.lzsa \
-	spaceship_switch_n.lzsa
+	spaceship_switch_n.lzsa \
+	tree4_n.lzsa tree4_s.lzsa tree4_w.lzsa
 	echo "m_link_book_lzsa: .incbin \"m_link_book.lzsa\"" > mist_graphics.inc
 	echo "dock_n_lzsa: .incbin \"dock_n.lzsa\"" >> mist_graphics.inc
 	echo "dock_s_lzsa: .incbin \"dock_s.lzsa\"" >> mist_graphics.inc
@@ -86,6 +87,9 @@ mist_graphics.inc:	\
 	echo "dentist_door_n_lzsa: .incbin \"dentist_door_n.lzsa\"" >> mist_graphics.inc
 	echo "dentist_door_s_lzsa: .incbin \"dentist_door_s.lzsa\"" >> mist_graphics.inc
 	echo "spaceship_switch_n_lzsa: .incbin \"spaceship_switch_n.lzsa\"" >> mist_graphics.inc
+	echo "tree4_n_lzsa: .incbin \"tree4_n.lzsa\"" >> mist_graphics.inc
+	echo "tree4_s_lzsa: .incbin \"tree4_s.lzsa\"" >> mist_graphics.inc
+	echo "tree4_w_lzsa: .incbin \"tree4_w.lzsa\"" >> mist_graphics.inc
 
 
 %.gr: %.png
diff --git a/mist/graphics_island/mist_graphics.inc b/mist/graphics_island/mist_graphics.inc
index 868122f1..5577645f 100644
--- a/mist/graphics_island/mist_graphics.inc
+++ b/mist/graphics_island/mist_graphics.inc
@@ -49,3 +49,6 @@ gear_base_n_lzsa: .incbin "gear_base_n.lzsa"
 dentist_door_n_lzsa: .incbin "dentist_door_n.lzsa"
 dentist_door_s_lzsa: .incbin "dentist_door_s.lzsa"
 spaceship_switch_n_lzsa: .incbin "spaceship_switch_n.lzsa"
+tree4_n_lzsa: .incbin "tree4_n.lzsa"
+tree4_s_lzsa: .incbin "tree4_s.lzsa"
+tree4_w_lzsa: .incbin "tree4_w.lzsa"
diff --git a/mist/graphics_island/tree4_n.png b/mist/graphics_island/tree4_n.png
new file mode 100644
index 00000000..62841f3e
Binary files /dev/null and b/mist/graphics_island/tree4_n.png differ
diff --git a/mist/graphics_island/tree4_s.png b/mist/graphics_island/tree4_s.png
new file mode 100644
index 00000000..37e41fdb
Binary files /dev/null and b/mist/graphics_island/tree4_s.png differ
diff --git a/mist/graphics_island/tree4_w.png b/mist/graphics_island/tree4_w.png
new file mode 100644
index 00000000..a2206210
Binary files /dev/null and b/mist/graphics_island/tree4_w.png differ
diff --git a/mist/mist.s b/mist/mist.s
index 94033914..30028649 100644
--- a/mist/mist.s
+++ b/mist/mist.s
@@ -816,7 +816,7 @@ locations:
 	.word location8, location9, location10,location11
 	.word location12,location13,location14,location15
 	.word location16,location17,location18,location19
-	.word location20,location21,location22
+	.word location20,location21,location22,location23
 
 ; myst linking book
 location0:
@@ -1103,7 +1103,7 @@ location13:
 ; pool
 location14:
 	.byte	$ff		; north exit
-	.byte	15		; south exit
+	.byte	23		; south exit
 	.byte	$ff		; east exit
 	.byte	$ff		; west exit
 	.byte	$ff		; north exit_dir
@@ -1185,7 +1185,7 @@ location17:
 
 ; tree corridor #5
 location18:
-	.byte	17		; north exit
+	.byte	23		; north exit
 	.byte	$ff		; south exit
 	.byte	$ff		; east exit
 	.byte	$ff		; west exit
@@ -1284,6 +1284,27 @@ location22:
 	.byte	BG_NORTH
 
 
+; tree corridor4 (with generator switch)
+location23:
+	.byte	17		; north exit
+	.byte	15		; south exit
+	.byte	$ff		; east exit
+	.byte	$ff		; west exit
+	.byte	DIRECTION_N	; north exit_dir
+	.byte	DIRECTION_S	; south exit_dir
+	.byte	$ff		; east exit_dir
+	.byte	$ff		; west exit_dir
+	.byte	$ff		; special exit
+	.word	tree4_n_lzsa	; north bg
+	.word	tree4_s_lzsa	; south bg
+	.word	$0000		; east bg
+	.word	tree4_w_lzsa	; west bg
+	.byte	$ff,$ff		; special x
+	.byte	$ff,$ff		; special y
+	.word	$0000		; special function
+	.byte	BG_NORTH|BG_SOUTH|BG_WEST
+
+