diff --git a/src-ui/changes.html b/src-ui/changes.html
index e2e43e28e..4cef4dad9 100644
--- a/src-ui/changes.html
+++ b/src-ui/changes.html
@@ -33,13 +33,13 @@
 <main>
 <div style="margin-bottom: 5px;"><b>Latest types</b> (<em><a href="/list.html" target="_parent">all types</a></em>)</div>
 <ul>
+  <li><a href="/p?oasis" target="_parent">Oasis</a></li>
   <li><a href="/p?circuitwalk" target="_parent">Circuit Walk</a></li>
   <li><a href="/p?cornerch" target="_parent">Corner Chain 隅角チェーン</a></li>
   <li><a href="/p?sendai" target="_parent">Sendai-Miyagi 宮城県仙台市</a></li>
   <li><a href="/p?keywest" target="_parent">Key West キーウエスト</a></li>
   <li><a href="/p?morningwalk" target="_parent">Morning Walk</a></li>
   <li><a href="/p?energywalk" target="_parent">Energy Walk</a></li>
-  <li><a href="/p?sansaroad" target="_parent">Sansa Road サンサロード</a></li>
 </ul>
 </main>
 </body>
diff --git a/src-ui/js/ui/KeyPopup.js b/src-ui/js/ui/KeyPopup.js
index 4684106af..15cf5a4d4 100644
--- a/src-ui/js/ui/KeyPopup.js
+++ b/src-ui/js/ui/KeyPopup.js
@@ -243,7 +243,8 @@ ui.keypopup = {
 		morningwalk: [10, 0],
 		energywalk: [10, 0],
 		cornerch: [10, 0],
-		keywest: [4, 4]
+		keywest: [4, 4],
+		oasis: [10, 0]
 	},
 
 	//---------------------------------------------------------------------------
diff --git a/src-ui/list.html b/src-ui/list.html
index affe78436..99ca64964 100644
--- a/src-ui/list.html
+++ b/src-ui/list.html
@@ -123,6 +123,7 @@ <h2 id="title"><span lang="ja">パズルの種類のリスト</span><span lang="
     <li data-pid="smullyan"></li>
     <li data-pid="outofsight"></li>
     <li data-pid="sumiwake"></li>
+    <li data-pid="oasis"></li>
    </ul>
   </div>
   <div class="lists loops">
diff --git a/src/pzpr/variety.js b/src/pzpr/variety.js
index 83a60fb62..f959b0196 100755
--- a/src/pzpr/variety.js
+++ b/src/pzpr/variety.js
@@ -326,6 +326,7 @@
 			nurimisaki: [0, 0, "ぬりみさき", "Nurimisaki", "kurodoko"],
 			nuritwin: [0, 0, "ぬりツイン", "Nuritwin", "shimaguni"],
 			nuriuzu: [0, 0, "ぬりうず", "Nuri-uzu", "tentaisho"],
+			oasis: [0, 0, "Oasis", "Oasis"],
 			ovotovata: [0, 0, "Ovotovata", "Ovotovata", "country"],
 			oneroom: [0, 0, "ワンルームワンドア", "One Room One Door", "heyawake"],
 			onsen: [0, 0, "温泉めぐり", "Onsen-meguri", "country"],
diff --git a/src/res/failcode.en.json b/src/res/failcode.en.json
index 33c7a7a82..9d85f339f 100644
--- a/src/res/failcode.en.json
+++ b/src/res/failcode.en.json
@@ -815,6 +815,8 @@
     "nmNumberNe.sukoro": "The number of numbers placed in four adjacent cells is not equal to the number.",
     "nmNumberNe.sukororoom": "The number of numbers placed in four adjacent cells is not equal to the number.",
     "nmNumberNe.view": "The number of numbers placed in four adjacent cells is not equal to the number.",
+    "nmOasisGt": "A number is larger than the amount of circles that can be reached.",
+    "nmOasisLt": "A number is smaller than the amount of circles that can be reached.",
     "nmOrbitNe.orbital": "A number does not indicate the amount of white circles used by the loop.",
     "nmOrder.numcity": "The size of a district is larger or equal to the size of the previous district.",
     "nmOutOfBk.oyakodori": "A bird is outside a nest.",
diff --git a/src/variety/oasis.js b/src/variety/oasis.js
new file mode 100644
index 000000000..93bae064a
--- /dev/null
+++ b/src/variety/oasis.js
@@ -0,0 +1,320 @@
+/* global Set:false */
+(function(pidlist, classbase) {
+	if (typeof module === "object" && module.exports) {
+		module.exports = [pidlist, classbase];
+	} else {
+		pzpr.classmgr.makeCustom(pidlist, classbase);
+	}
+})(["oasis"], {
+	//---------------------------------------------------------
+	// マウス入力系
+	MouseEvent: {
+		RBShadeCell: true,
+		use: true,
+		inputModes: {
+			edit: ["number", "clear"],
+			play: ["shade", "unshade", "peke", "completion"]
+		},
+		mouseinput_auto: function() {
+			if (this.puzzle.playmode) {
+				if (this.mousestart) {
+					this.isDraggingPeke = this.puzzle.key.isALT;
+				}
+				if (this.isDraggingPeke) {
+					this.inputpeke();
+				} else if (this.btn === "left" && this.mousestart) {
+					if (!this.inputqcmp()) {
+						this.inputcell();
+					}
+				} else if (this.inputData === null || this.inputData < 20) {
+					this.inputcell();
+				}
+			} else if (this.puzzle.editmode) {
+				if (this.mousestart) {
+					this.inputqnum();
+				}
+			}
+		},
+		inputqcmp: function() {
+			var cell = this.getcell();
+			if (cell.isnull || !cell.isNum()) {
+				return false;
+			}
+
+			this.inputData = 20;
+			cell.setQcmp(+!cell.qcmp);
+			cell.draw();
+
+			this.mousereset();
+			return true;
+		}
+	},
+
+	//---------------------------------------------------------
+	// キーボード入力系
+	KeyEvent: {
+		enablemake: true
+	},
+
+	//---------------------------------------------------------
+	// 盤面管理系
+	Cell: {
+		numberRemainsUnshaded: true,
+
+		maxnum: function() {
+			return this.board.cols * this.board.rows - 1;
+		},
+
+		isCmp: function() {
+			if (!this.isNum()) {
+				return false;
+			}
+			if (this.qcmp === 1) {
+				return true;
+			}
+			if (!this.isValidNum() || !this.puzzle.execConfig("autocmp")) {
+				return false;
+			}
+			return this.countResult(true) === 0;
+		},
+
+		countResult: function(explicit) {
+			if (!this.isValidNum()) {
+				return 0;
+			}
+			var targets = new Set();
+			for (var dir in this.adjacent) {
+				var c = this.adjacent[dir];
+				if (c.isNum()) {
+					targets.add(c);
+				}
+				var group = explicit ? c.autooasis : c.oasis;
+				if (group) {
+					group.adjclist.each(function(obj) {
+						targets.add(obj);
+					});
+				}
+			}
+			targets.delete(this);
+			return targets.size - this.qnum;
+		},
+		redrawConnected: function() {
+			if (this.autooasis) {
+				this.autooasis.adjclist.each(function(c) {
+					c.draw();
+				});
+			} else {
+				for (var dir in this.adjacent) {
+					var c = this.adjacent[dir];
+					if (c && c.autooasis) {
+						c.redrawConnected();
+					} else if (c && c.isNum()) {
+						c.draw();
+					}
+				}
+			}
+		},
+
+		posthook: {
+			qnum: function() {
+				var bd = this.board;
+				var oasis = new Set();
+				var autooasis = new Set();
+
+				for (var dir in this.adjacent) {
+					var c = this.adjacent[dir];
+					if (c && c.oasis) {
+						oasis.add(c.oasis);
+					}
+					if (c && c.autooasis) {
+						autooasis.add(c.autooasis);
+					}
+				}
+
+				oasis.forEach(function(cmp) {
+					bd.oasisgraph.setExtraData(cmp);
+				});
+				autooasis.forEach(function(cmp) {
+					bd.autooasisgraph.setExtraData(cmp);
+				});
+				this.redrawConnected();
+			},
+			qsub: function() {
+				this.redrawConnected();
+			}
+		}
+	},
+	Board: {
+		hasborder: 1,
+		cols: 8,
+		rows: 8,
+
+		addExtraInfo: function() {
+			this.oasisgraph = this.addInfoList(this.klass.ImplicitOasisGraph);
+			this.autooasisgraph = this.addInfoList(this.klass.ExplicitOasisGraph);
+		}
+	},
+
+	AreaUnshadeGraph: {
+		enabled: true
+	},
+	"ImplicitOasisGraph:AreaGraphBase": {
+		enabled: true,
+		relation: { "cell.qans": "node", "cell.qnum": "node", "cell.qsub": "node" },
+		setExtraData: function(component) {
+			this.common.setExtraData.call(this, component);
+
+			var set = new Set();
+
+			component.clist.each(function(cell) {
+				for (var dir in cell.adjacent) {
+					var adj = cell.adjacent[dir];
+					if (adj.isNum()) {
+						set.add(adj);
+					}
+				}
+			});
+			component.adjclist = new this.klass.CellList(Array.from(set));
+		},
+
+		isnodevalid: function(cell) {
+			return cell.isUnshade() && !cell.isNum();
+		},
+
+		getComponentRefs: function(obj) {
+			return obj.oasis;
+		},
+		setComponentRefs: function(obj, component) {
+			obj.oasis = component;
+		},
+		getObjNodeList: function(nodeobj) {
+			return nodeobj.oasisnodes;
+		},
+		resetObjNodeList: function(nodeobj) {
+			nodeobj.oasisnodes = [];
+		}
+	},
+	"ExplicitOasisGraph:ImplicitOasisGraph": {
+		isnodevalid: function(cell) {
+			return cell.isUnshade() && !cell.isNum() && cell.qsub;
+		},
+		getComponentRefs: function(obj) {
+			return obj.autooasis;
+		},
+		setComponentRefs: function(obj, component) {
+			obj.autooasis = component;
+		},
+		getObjNodeList: function(nodeobj) {
+			return nodeobj.autooasisnodes;
+		},
+		resetObjNodeList: function(nodeobj) {
+			nodeobj.autooasisnodes = [];
+		}
+	},
+
+	//---------------------------------------------------------
+	// 画像表示系
+	Graphic: {
+		qanscolor: "black",
+		gridcolor_type: "LIGHT",
+
+		autocmp: "number",
+		hideHatena: true,
+
+		paint: function() {
+			this.drawBGCells();
+			this.drawDotCells();
+			this.drawGrid();
+			this.drawShadedCells();
+
+			this.drawCircledNumbers();
+
+			this.drawChassis();
+
+			this.drawPekes();
+
+			this.drawTarget();
+		},
+
+		getCircleFillColor: function(cell) {
+			if (!cell.isNum()) {
+				return null;
+			}
+			return cell.isCmp() ? this.qcmpcolor : this.bgcolor;
+		}
+	},
+
+	//---------------------------------------------------------
+	// URLエンコード/デコード処理
+	Encode: {
+		decodePzpr: function(type) {
+			this.decodeNumber16();
+		},
+		encodePzpr: function(type) {
+			this.encodeNumber16();
+		}
+	},
+	//---------------------------------------------------------
+	FileIO: {
+		decodeData: function() {
+			this.decodeCellQnum();
+			this.decodeCellQanssubcmp();
+			this.decodeBorderLine();
+		},
+		encodeData: function() {
+			this.encodeCellQnum();
+			this.encodeCellQanssubcmp();
+			this.encodeBorderLineIfPresent();
+		},
+
+		decodeCellQanssubcmp: function() {
+			this.decodeCell(function(cell, ca) {
+				if (ca === "+") {
+					cell.qsub = 1;
+				} else if (ca === "-") {
+					cell.qcmp = 1;
+				} else if (ca === "1") {
+					cell.qans = 1;
+				}
+			});
+		},
+		encodeCellQanssubcmp: function() {
+			this.encodeCell(function(cell) {
+				if (cell.qans === 1) {
+					return "1 ";
+				} else if (cell.qsub === 1) {
+					return "+ ";
+				} else if (cell.qcmp === 1) {
+					return "- ";
+				} else {
+					return ". ";
+				}
+			});
+		}
+	},
+
+	//---------------------------------------------------------
+	// 正解判定処理実行部
+	AnsCheck: {
+		checklist: [
+			"checkShadeCellExist",
+			"checkAdjacentShadeCell",
+			"checkConnectUnshadeRB",
+			"checkCellNumberLarge",
+			"check2x2UnshadeCell++",
+			"checkCellNumberSmall",
+			"doneShadingDecided"
+		],
+
+		checkCellNumberLarge: function() {
+			this.checkAllCell(function(cell) {
+				return cell.countResult(false) < 0;
+			}, "nmOasisGt");
+		},
+		checkCellNumberSmall: function() {
+			this.checkAllCell(function(cell) {
+				return cell.countResult(false) > 0;
+			}, "nmOasisLt");
+		}
+	}
+});
diff --git a/test/script/oasis.js b/test/script/oasis.js
new file mode 100644
index 000000000..076b536a9
--- /dev/null
+++ b/test/script/oasis.js
@@ -0,0 +1,57 @@
+/* oasis.js */
+
+ui.debug.addDebugData("oasis", {
+	url: "6/6/2.m.l3h2l.m.1",
+	failcheck: [
+		[
+			"brNoShade",
+			"pzprv3/oasis/6/6/2 - . . . . /. . . - . . /. . . . 3 . /. 2 . . . . /. . - . . . /. . . . - 1 /. . . . . . /. . . . . . /. . . . . . /. . . . . . /. . . . . . /. . . . . . /"
+		],
+		[
+			"csAdjacent",
+			"pzprv3/oasis/6/6/2 - . . . . /. . . - . . /. . . . 3 . /. 2 . . . . /. . - . . . /. . . . - 1 /. . . . . . /. . . . . . /. . 1 . . . /. . 1 . . . /. . . . . . /. . . . . . /"
+		],
+		[
+			"cuDivideRB",
+			"pzprv3/oasis/6/6/2 - . . . . /. . . - . . /. . . . 3 . /. 2 . . . . /. . - . . . /. . . . - 1 /. . 1 . . . /. 1 . . 1 . /. . 1 . . 1 /1 . . 1 . . /. 1 . . . 1 /. . 1 . . . /"
+		],
+		[
+			"nmOasisGt",
+			"pzprv3/oasis/6/6/2 - . . . . /. . . - . . /. . . . 3 . /. 2 . . . . /. . - . . . /. . . . - 1 /. . . 1 . 1 /1 . 1 . . . /. . . 1 . 1 /1 . 1 . . . /. . . 1 . 1 /. 1 . . . . /"
+		],
+		[
+			"nmOasisLt",
+			"pzprv3/oasis/6/6/2 - . . . . /. . . - . . /. . . . 3 . /. 2 . . . . /. . - . . . /. . . . - 1 /. . 1 . . . /. 1 . . 1 . /. . . 1 . . /1 . 1 . . 1 /. . . . 1 . /1 . 1 . . . /"
+		],
+		[
+			"cu2x2",
+			"pzprv3/oasis/6/6/2 - . . . . /. . . - . . /. . . . 3 . /. 2 . . . . /. . - . . . /. . . . - 1 /. . . 1 . 1 /. 1 . . . . /. . 1 . . 1 /1 . . 1 . . /. . . . . 1 /. 1 . 1 . . /"
+		],
+		[
+			null,
+			"pzprv3/oasis/6/6/2 - . . . . /. . . - . . /. . . . 3 . /. 2 . . . . /. . - . . . /. . . . - 1 /+ + 1 + + + /+ 1 + + 1 + /+ + 1 + + 1 /1 + + 1 + + /+ 1 + + + 1 /+ + + 1 + + /"
+		]
+	],
+	inputs: [
+		{
+			input: [
+				"newboard,3,3",
+				"editmode",
+				"cursor,3,1",
+				"key,1",
+				"playmode",
+				"mouse,left,3,3",
+				"mouse,right,5,3"
+			],
+			result: "pzprv3/oasis/3/3/. 1 . /. . . /. . . /. . . /. 1 + /. . . /"
+		},
+		{
+			input: ["editmode", "cursor,5,5", "key,2", "playmode", "mouse,left,3,1"],
+			result: "pzprv3/oasis/3/3/. 1 . /. . . /. . 2 /. - . /. 1 + /. . . /"
+		},
+		{
+			input: ["mouse,left,5,5", "playmode,completion", "mouse,left,3,1"],
+			result: "pzprv3/oasis/3/3/. 1 . /. . . /. . 2 /. . . /. 1 + /. . - /"
+		}
+	]
+});