diff --git a/assets/bgm/BGM004.txt b/assets/bgm/BGM004.txt
new file mode 100644
index 0000000..fe7dbc9
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diff --git a/assets/levels/R9/Z1.tmx b/assets/levels/R9/Z1.tmx
index 61bdcd6..f2d978d 100644
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diff --git a/assets/levels/R9/tiles16.tsx b/assets/levels/R9/tiles16.tsx
index e8eea44..118e996 100644
--- a/assets/levels/R9/tiles16.tsx
+++ b/assets/levels/R9/tiles16.tsx
@@ -384,6 +384,41 @@
    </object>
   </objectgroup>
  </tile>
+ <tile id="171">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="16.0909" y="11.2727">
+    <polygon points="0,0 -0.0909091,4.72727 -16.0909,4.72727"/>
+   </object>
+  </objectgroup>
+ </tile>
+ <tile id="172">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="16.1818" y="7">
+    <polygon points="0,0 -0.181818,9 -16.1818,9 -16.1818,4"/>
+   </object>
+  </objectgroup>
+ </tile>
+ <tile id="173">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="15.8182" y="3.27273">
+    <polygon points="0,0 0.181818,12.7273 -15.8182,12.7273 -15.8182,3.54545"/>
+   </object>
+  </objectgroup>
+ </tile>
+ <tile id="174">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="15.9091" y="1.09091">
+    <polygon points="0,0 0.0909091,14.9091 -15.9091,14.9091 -15.8182,1.81818"/>
+   </object>
+  </objectgroup>
+ </tile>
+ <tile id="175">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="16" y="0">
+    <polygon points="0,0 0,16 -16,16 -16,1.18182"/>
+   </object>
+  </objectgroup>
+ </tile>
  <tile id="180">
   <objectgroup draworder="index" id="2">
    <object id="1" x="0" y="0" width="16" height="16"/>
@@ -416,6 +451,48 @@
    </object>
   </objectgroup>
  </tile>
+ <tile id="190">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="16" y="0">
+    <polygon points="0,0 0,16 -16,16 -15.9091,2.81818"/>
+   </object>
+  </objectgroup>
+ </tile>
+ <tile id="191">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="0" y="0" width="16" height="16"/>
+  </objectgroup>
+ </tile>
+ <tile id="192">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="0" y="0" width="16" height="16"/>
+  </objectgroup>
+ </tile>
+ <tile id="193">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="0" y="0" width="16" height="16"/>
+  </objectgroup>
+ </tile>
+ <tile id="194">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="0" y="0" width="16" height="16"/>
+  </objectgroup>
+ </tile>
+ <tile id="195">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="0" y="0" width="16" height="16"/>
+  </objectgroup>
+ </tile>
+ <tile id="309">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="0" y="0" width="16" height="16"/>
+  </objectgroup>
+ </tile>
+ <tile id="310">
+  <objectgroup draworder="index" id="2">
+   <object id="1" x="0" y="0" width="16" height="16"/>
+  </objectgroup>
+ </tile>
  <tile id="320">
   <objectgroup draworder="index" id="2">
    <object id="1" x="0" y="0" width="16" height="16"/>
diff --git a/include/sound.h b/include/sound.h
index 123197e..bc23d69 100644
--- a/include/sound.h
+++ b/include/sound.h
@@ -95,7 +95,8 @@ typedef enum {
     BGM_DAWNCANYON   = 11,
     BGM_AMAZINGOCEAN = 12,
     BGM_EGGMANLAND   = 13,
-    BGM_NUM_SONGS    = BGM_EGGMANLAND + 1,
+    BGM_WINDMILLISLE = 14,
+    BGM_NUM_SONGS    = BGM_WINDMILLISLE + 1,
 } BGMOption;
 
 typedef struct {
diff --git a/iso.xml b/iso.xml
index ce4f871..0ebb51e 100644
--- a/iso.xml
+++ b/iso.xml
@@ -366,6 +366,9 @@
 	<file name="BGM003.XA"
 	      type="xa"
 	      source="${PROJECT_SOURCE_DIR}/assets/bgm/BGM003.XA" />
+	<file name="BGM004.XA"
+	      type="xa"
+	      source="${PROJECT_SOURCE_DIR}/assets/bgm/BGM004.XA" />
 	<file name="MNU001.XA"
 	      type="xa"
 	      source="${PROJECT_SOURCE_DIR}/assets/bgm/MNU001.XA" />
diff --git a/src/screen_credits.c b/src/screen_credits.c
index 02cd7a3..14b1c21 100644
--- a/src/screen_credits.c
+++ b/src/screen_credits.c
@@ -90,6 +90,11 @@ static const char *creditstxt[] = {
     "By Richard Jacques",
     "\r",
 
+    "Windmill Isle",
+    "Windmill Isle Day: Silent Dreams Remix",
+    "By Silent Dreams",
+    "\r",
+
     /* SFX */
     "Sound Effects Ripping",
     "luksamuk",
diff --git a/src/screen_level.c b/src/screen_level.c
index 65ed22a..f15732b 100644
--- a/src/screen_level.c
+++ b/src/screen_level.c
@@ -1009,6 +1009,7 @@ level_play_music(uint8_t round, uint8_t act)
     case 6: break; // TODO
     case 7: break; // TODO
     case 8: sound_bgm_play(BGM_EGGMANLAND);      break;
+    case 9: sound_bgm_play(BGM_WINDMILLISLE);    break;
     default: break;
     }
 }
diff --git a/src/sound_bgmtable.c b/src/sound_bgmtable.c
index 9a1003d..b1a55e1 100644
--- a/src/sound_bgmtable.c
+++ b/src/sound_bgmtable.c
@@ -22,6 +22,8 @@ const BGMTableEntry bgm_table[] = {
     {"\\BGM\\BGM003.XA;1",   0, 3900, 0}, // DCZ
     {"\\BGM\\BGM003.XA;1",   2, 7420, 0}, // A0Z
     {"\\BGM\\BGM003.XA;1",   1, 2830, 0}, // EZ
+
+    {"\\BGM\\BGM004.XA;1",   0, 9300, 0}, // WIZ
 };
 
 static CdlLOC bgm_table_locs[BGM_NUM_SONGS];