diff --git a/src-ui/img/disco.png b/src-ui/img/disco.png
new file mode 100644
index 000000000..c3e3fa883
Binary files /dev/null and b/src-ui/img/disco.png differ
diff --git a/src-ui/js/ui/Misc.js b/src-ui/js/ui/Misc.js
index e09e4b3b8..4832cc4b6 100755
--- a/src-ui/js/ui/Misc.js
+++ b/src-ui/js/ui/Misc.js
@@ -138,6 +138,7 @@ function toBGimage(pid) {
 		"dbchoco",
 		"detour",
 		"diamond",
+		"disco",
 		"dominion",
 		"doppelblock",
 		"dotchi",
diff --git a/src-ui/list.html b/src-ui/list.html
index e355d4f26..bdfb67a43 100644
--- a/src-ui/list.html
+++ b/src-ui/list.html
@@ -103,6 +103,7 @@ <h2 id="title"><span lang="ja">パズルの種類のリスト</span><span lang="
     <li data-pid="marutaring"></li>
     <li data-pid="tetroctb"></li>
     <li data-pid="bramble"></li>
+    <li data-pid="disco"></li>
    </ul>
   </div>
   <div class="lists blocks">
diff --git a/src/pzpr/variety.js b/src/pzpr/variety.js
index d25fc8338..4122c1e7c 100755
--- a/src/pzpr/variety.js
+++ b/src/pzpr/variety.js
@@ -150,6 +150,7 @@
 			dbchoco: [0, 0, "ダブルチョコ", "Double Choco", "cbblock"],
 			detour: [0, 0, "Detour", "Detour", "country"],
 			diamond: [0, 0, "Diamond Chain", "Diamond Chain"],
+			disco: [0, 0, "ディスコネクション", "Disconnection", "shimaguni"],
 			disloop: [0, 0, "Disorderly Loop", "Disorderly Loop", "tapaloop"],
 			distopia: [0, 0, "Distopia", "Distopia", "statuepark"],
 			dominion: [0, 0, "ドミニオン", "Dominion"],
diff --git a/src/res/failcode.en.json b/src/res/failcode.en.json
index 8db5e1e7c..e66c7b7ea 100644
--- a/src/res/failcode.en.json
+++ b/src/res/failcode.en.json
@@ -335,7 +335,7 @@
     "bkSumNeBn.yosenabe": "Sum of filling is not equal to a crock.",
     "bkUCGe2.dosufuwa": "An area has two or more balloons.",
     "bkUnitNe2.kuroclone": "There is an area without exactly two units.",
-    "bkUnitNe2.nuritwin": "An area doesn't have exactly two blocks.",
+    "bkUnitNe2": "An area doesn't have exactly two blocks.",
     "bkUnknown.lohkous": "A room has a segment of invalid length.",
     "bkUnshade.lapaz": "A 1x1 region is unshaded.",
     "bkUnshadeConsecGt3": "There is a line of consecutive unshaded cells that goes through 2 region borders.",
diff --git a/src/res/failcode.ja.json b/src/res/failcode.ja.json
index ae9eb1157..d99e55ed9 100644
--- a/src/res/failcode.ja.json
+++ b/src/res/failcode.ja.json
@@ -845,7 +845,7 @@
     "lnAdjacent.tjunction": "同じ方向の枝分かれした線が隣接しています。",
     "bkMaxSizeNe.tilecity": "県の中で最も大きい市の面積と数字が違います。",
     "bkSizeNe.balloon": "風船の大きさと数字が一致していません。",
-    "bkUnitNe2.nuritwin": "領域に置かれているブロックの数が2つではありません。",
+    "bkUnitNe2": "領域に置かれているブロックの数が2つではありません。",
     "lcDivided.tjunction": "線が分断されています。",
     "csSameJunction": "黒マスが同じ方向をした複数の枝分かれした線に触れています。",
     "haisuSG.recoil": "菱形から複数本の線が伸びています。",
diff --git a/src/variety/shimaguni.js b/src/variety/shimaguni.js
index 3d8e97181..f183df4f4 100644
--- a/src/variety/shimaguni.js
+++ b/src/variety/shimaguni.js
@@ -19,7 +19,8 @@
 		"nuritwin",
 		"marutaring",
 		"tetroctb",
-		"bramble"
+		"bramble",
+		"disco"
 	],
 	{
 		//---------------------------------------------------------
@@ -45,6 +46,15 @@
 				play: ["shade", "unshade", "info-blk"]
 			}
 		},
+		"MouseEvent@disco": {
+			inputModes: {
+				edit: ["info-blk"],
+				play: ["shade", "unshade", "info-blk"]
+			},
+			mouseinputAutoEdit: function() {
+				this.inputborder();
+			}
+		},
 		"MouseEvent@cocktail,martini,tetroctb,bramble#2": {
 			dispInfoBlk: function() {
 				var cell = this.getcell();
@@ -184,7 +194,7 @@
 		Board: {
 			hasborder: 1
 		},
-		"Board@shimaguni,stostone,heyablock,cocktail,martini,nuritwin,marutaring,tetroctb": {
+		"Board@shimaguni,stostone,heyablock,cocktail,martini,nuritwin,marutaring,tetroctb,disco": {
 			addExtraInfo: function() {
 				this.stonegraph = this.addInfoList(this.klass.AreaStoneGraph);
 			}
@@ -306,7 +316,7 @@
 		"AreaShadeGraph@chocona,tetroctb,bramble": {
 			enabled: true
 		},
-		"AreaShadeGraph@nuritwin,marutaring": {
+		"AreaShadeGraph@nuritwin,marutaring,disco": {
 			enabled: true,
 			coloring: true
 		},
@@ -318,7 +328,7 @@
 				component.hinge = null;
 			}
 		},
-		"AreaStoneGraph:AreaShadeGraph@shimaguni,stostone,heyablock,cocktail,martini,nuritwin,marutaring,tetroctb": {
+		"AreaStoneGraph:AreaShadeGraph@shimaguni,stostone,heyablock,cocktail,martini,nuritwin,marutaring,tetroctb,disco": {
 			// Same as LITS AreaTetrominoGraph
 			enabled: true,
 			relation: { "cell.qans": "node", "border.ques": "separator" },
@@ -374,20 +384,21 @@
 			paint: function() {
 				this.drawBGCells();
 
-				if (this.pid !== "nuritwin") {
+				if (this.pid !== "nuritwin" && this.pid !== "disco") {
 					this.drawGrid();
 				}
 
 				if (
 					this.pid === "stostone" ||
 					this.pid === "nuritwin" ||
+					this.pid === "disco" ||
 					this.pid === "marutaring"
 				) {
 					this.drawDotCells_stostone();
 				}
 				this.drawShadedCells();
 
-				if (this.pid === "nuritwin") {
+				if (this.pid === "nuritwin" || this.pid === "disco") {
 					this.drawGrid();
 				}
 
@@ -423,7 +434,7 @@
 				);
 			}
 		},
-		"Graphic@stostone,nuritwin,marutaring#1": {
+		"Graphic@stostone,nuritwin,marutaring,disco#1": {
 			irowakeblk: true,
 			bgcellcolor_func: "error1",
 			bcolor: "rgb(80, 204, 80)",
@@ -534,7 +545,7 @@
 					: this.getCircleFillColor_qnum(cell);
 			}
 		},
-		"Graphic@martini,nuritwin#2": {
+		"Graphic@martini,nuritwin,disco#2": {
 			shadecolor: "#444444"
 		},
 
@@ -560,6 +571,14 @@
 				this.encodeNumber16();
 			}
 		},
+		"Encode@disco": {
+			decodePzpr: function(type) {
+				this.decodeBorder();
+			},
+			encodePzpr: function(type) {
+				this.encodeBorder();
+			}
+		},
 		//---------------------------------------------------------
 		FileIO: {
 			decodeData: function() {
@@ -584,6 +603,16 @@
 				}
 			}
 		},
+		"FileIO@disco": {
+			decodeData: function() {
+				this.decodeBorderQues();
+				this.decodeCellAns();
+			},
+			encodeData: function() {
+				this.encodeBorderQues();
+				this.encodeCellAns();
+			}
+		},
 
 		//---------------------------------------------------------
 		// 正解判定処理実行部
@@ -631,11 +660,11 @@
 				"checkShadeCellCount"
 			]
 		},
-		"AnsCheck@nuritwin#1": {
+		"AnsCheck@nuritwin,disco#1": {
 			checklist: [
 				"check2x2ShadeCell",
-				"checkShadeBlockSize",
-				"checkSizesEqual",
+				"checkShadeBlockSize@nuritwin",
+				"checkSizesEqual@nuritwin",
 				"checkTwoBlocks",
 				"checkConnectShade",
 				"checkNoShadeCellInArea",
@@ -987,7 +1016,7 @@
 				this.checkOneArea(this.board.sblk8mgr, "csDivide");
 			}
 		},
-		"AnsCheck@nuritwin": {
+		"AnsCheck@nuritwin,disco": {
 			checkShadeBlockSize: function() {
 				var blocks = this.board.stonegraph.components;
 				for (var id = 0; id < blocks.length; id++) {
diff --git a/test/script/disco.js b/test/script/disco.js
new file mode 100644
index 000000000..896b30903
--- /dev/null
+++ b/test/script/disco.js
@@ -0,0 +1,28 @@
+/* disco.js */
+
+ui.debug.addDebugData("disco", {
+	url: "5/5/d552apfg",
+	failcheck: [
+		[
+			"bkNoShade",
+			"pzprv3/disco/5/5/0 1 1 0 /1 0 0 1 /0 1 0 0 /1 0 1 0 /0 0 1 0 /0 1 0 1 0 /1 1 0 0 1 /0 1 1 1 1 /1 0 0 0 0 /. . . # . /. # # # # /. # . . # /# # # . # /# . # # . /"
+		],
+		[
+			"bkUnitNe2",
+			"pzprv3/disco/5/5/0 1 1 0 /1 0 0 1 /0 1 0 0 /1 0 1 0 /0 0 1 0 /0 1 0 1 0 /1 1 0 0 1 /0 1 1 1 1 /1 0 0 0 0 /. # # # . /# # . # # /. # . . # /# # # . # /# . # # . /"
+		],
+		[
+			"csDivide",
+			"pzprv3/disco/5/5/0 1 1 0 /1 0 0 1 /0 1 0 0 /1 0 1 0 /0 0 1 0 /0 1 0 1 0 /1 1 0 0 1 /0 1 1 1 1 /1 0 0 0 0 /. # . # . /# # # # # /. # . . # /# # # # . /# . # . # /"
+		],
+		[
+			"cs2x2",
+			"pzprv3/disco/5/5/0 1 1 0 /1 0 0 1 /0 1 0 0 /1 0 1 0 /0 0 1 0 /0 1 0 1 0 /1 1 0 0 1 /0 1 1 1 1 /1 0 0 0 0 /. # # # . /# # # . # /. # . . # /# # # . # /# . # # . /"
+		],
+		[
+			null,
+			"pzprv3/disco/5/5/0 1 1 0 /1 0 0 1 /0 1 0 0 /1 0 1 0 /0 0 1 0 /0 1 0 1 0 /1 1 0 0 1 /0 1 1 1 1 /1 0 0 0 0 /. # . # . /# # # # # /. # . . # /# # # . # /# . # # . /"
+		]
+	],
+	inputs: []
+});