diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/RegularLevel.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/RegularLevel.java
index 6a723f404..d10d3838c 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/RegularLevel.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/RegularLevel.java
@@ -79,7 +79,7 @@ public abstract class RegularLevel extends Level {
 				r.neigbours.clear();
 				r.connected.clear();
 			}
-			rooms = builder.build(initRooms);
+			rooms = builder.build((ArrayList<Room>)initRooms.clone());
 		} while (rooms == null);
 		
 		return painter().paint(this, rooms);
@@ -382,6 +382,7 @@ public abstract class RegularLevel extends Level {
 					} while (traps.get(result) != null
 							|| findMob(result) != null
 							|| heaps.get(result) != null);
+					return result;
 				}
 			}
 		}
diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/SewerBossLevel.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/SewerBossLevel.java
index 3698f3143..7f3f9b44c 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/SewerBossLevel.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/SewerBossLevel.java
@@ -71,6 +71,18 @@ public class SewerBossLevel extends SewerLevel {
 		return super.builder();
 	}
 	
+	@Override
+	protected void placeSign() {
+		while (true) {
+			int pos = pointToCell(roomEntrance.random());
+			if (map[pos] != Terrain.LOCKED_EXIT
+					&& map[pos] != Terrain.WALL_DECO) {
+				map[pos] = Terrain.SIGN;
+				break;
+			}
+		}
+	}
+	
 	@Override
 	protected float waterFill(){
 		return 0.50f;
diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/builders/LineBuilder.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/builders/LineBuilder.java
index f10d4c6c0..9b056cc38 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/builders/LineBuilder.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/builders/LineBuilder.java
@@ -41,9 +41,9 @@ public class LineBuilder extends Builder {
 	}
 
 	//path length is the percentage of pathable rooms that are on the path
-	private float pathLength = 0.2f;
+	private float pathLength = 0.1f;
 	//The chance weights for extra rooms to be added to the path
-	private float[] pathLenJitterChances = new float[]{1, 1};
+	private float[] pathLenJitterChances = new float[]{0, 2, 1};
 
 	public LineBuilder setPathLength( float len, float[] jitter ){
 		pathLength = len;
@@ -51,8 +51,8 @@ public class LineBuilder extends Builder {
 		return this;
 	}
 
-	private float[] pathTunnelChances = new float[]{1, 2, 1};
-	private float[] branchTunnelChances = new float[]{2, 1, 1};
+	private float[] pathTunnelChances = new float[]{2, 3, 1};
+	private float[] branchTunnelChances = new float[]{3, 2, 1};
 
 	public LineBuilder setTunnelLength( float[] path, float[] branch){
 		pathTunnelChances = path;
@@ -106,7 +106,7 @@ public class LineBuilder extends Builder {
 			placeRoom(rooms, entrance, shop, direction + 180f);
 		}
 		
-		int roomsOnPath = Math.round(multiConnections.size()*pathLength + Random.chances(pathLenJitterChances));
+		int roomsOnPath = (int)(multiConnections.size()*pathLength) + Random.chances(pathLenJitterChances);
 		roomsOnPath = Math.min(roomsOnPath, multiConnections.size());
 		
 		Room curr = entrance;
diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/special/SpecialRoom.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/special/SpecialRoom.java
index b089b5c6c..ddc11dca4 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/special/SpecialRoom.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/special/SpecialRoom.java
@@ -120,12 +120,6 @@ public class SpecialRoom extends Room {
 			floorSpecials.remove( WeakFloorRoom.class );
 			
 			return new PitRoom();
-		
-			//TODO should laboratory rooms be more common like this?
-		} else if (Dungeon.depth % 5 == 2 && floorSpecials.contains( LaboratoryRoom.class )) {
-			
-			useType(LaboratoryRoom.class);
-			return new LaboratoryRoom();
 			
 		} else if (Dungeon.depth >= guaranteedWellDepth) {
 			useType( MagicWellRoom.class );
diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/standard/SewerBossEntranceRoom.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/standard/SewerBossEntranceRoom.java
index e11cc1d44..45d2f2dc6 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/standard/SewerBossEntranceRoom.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/rooms/standard/SewerBossEntranceRoom.java
@@ -31,30 +31,31 @@ public class SewerBossEntranceRoom extends EntranceRoom {
 	
 	@Override
 	public int minWidth() {
-		return 11;
+		return 9;
 	}
 	
 	@Override
 	public int maxWidth() {
-		return 11;
+		return 9;
 	}
 	
 	@Override
 	public int minHeight() {
-		return 5;
+		return 6;
 	}
 	
 	@Override
 	public int maxHeight() {
-		return 8;
+		return 10;
 	}
 	
 	//TODO perhaps I just want to deny all top-side connections
 	@Override
 	public boolean canConnect(Point p) {
-		//refuses connections on the center 3 tiles on the top side
+		//refuses connections on the center 3 tiles on the top side, and the top tile along left/right
 		return super.canConnect(p)
-				&& !(p.y == top && p.x >= (left + (width()/2 - 1)) && p.x <= (left + (width()/2 + 1)));
+				&& !(p.y == top && p.x >= (left + (width()/2 - 1)) && p.x <= (left + (width()/2 + 1)))
+				&& p.y != top+1;
 	}
 	
 	public void paint(Level level ) {