Index: binaries/data/mods/public/maps/random/rmgen/math.js
===================================================================
--- binaries/data/mods/public/maps/random/rmgen/math.js
+++ binaries/data/mods/public/maps/random/rmgen/math.js
@@ -175,3 +175,49 @@
 
 	return order;
 }
+
+/**
+ * Flood fill algorithm to verify if all the points are connected against the given list of tileClass
+ */
+function areConnected(points, tileClasses)
+{
+	let connectionArray = new Uint8Array(mapSize*mapSize).fill(0);
+	let initialPos = pickRandom(points);
+	let tilesToVisit = [new Vector2D(initialPos.x, initialPos.y)];
+	let connectionAmount = 0;
+	while (tilesToVisit.length > 0) {
+		let position = tilesToVisit.pop();
+		let idx = position.x * mapSize + position.y;
+		if (connectionArray[idx] != 0) {
+			continue;
+		}
+		if (!g_Map.validTilePassable(position)) {
+			connectionArray[idx] = 1;
+			continue;
+		}
+		let tcValid = true;
+		for (let tileClass of tileClasses) {
+			if (tileClass.has(position)) {
+				connectionArray[idx] = 1;
+				tcValid = false;
+			}
+		}
+		if (!tcValid) {
+			continue;
+		}
+		connectionArray[idx] = 1;
+		for (let point of points) {			
+			if (position.x == point.x && position.y == point.y) {
+				connectionAmount++;
+				if (connectionAmount == points.length) {
+					return true;
+				}
+			}
+		}
+		tilesToVisit.push(new Vector2D(position.x + 1, position.y));
+		tilesToVisit.push(new Vector2D(position.x - 1, position.y));
+		tilesToVisit.push(new Vector2D(position.x, position.y + 1));
+		tilesToVisit.push(new Vector2D(position.x, position.y - 1));
+	}
+	return false;
+}