diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/VaultLevel.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/VaultLevel.java
index 9353525f4..378bffebf 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/VaultLevel.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/VaultLevel.java
@@ -54,7 +54,8 @@ public class VaultLevel extends CityLevel {
 		initRooms.add(roomEntrance = new EntranceRoom(){
 			@Override
 			public int maxConnections(int direction) {
-				return 1;
+				if (direction == LEFT || direction == TOP) return 0;
+				return super.maxConnections(direction);
 			}
 
 			@Override
@@ -73,6 +74,16 @@ public class VaultLevel extends CityLevel {
 		}
 
 		initRooms.add(new RegionDecoLineRoom(){
+			@Override
+			public float[] sizeCatProbs() {
+				return new float[]{0, 0, 1};
+			}
+
+			@Override
+			public boolean isExit() {
+				return true;
+			}
+
 			@Override
 			public int maxConnections(int direction) {
 				return 1;
@@ -113,7 +124,8 @@ public class VaultLevel extends CityLevel {
 					((Armor) item).inscribe(null);
 				}
 			}
-			item.identify();
+			//not true ID, prevents extra info about rings leaking to main game
+			item.levelKnown = item.cursedKnown = true;
 			addItemToSpawn(item);
 		}
 
@@ -184,8 +196,6 @@ public class VaultLevel extends CityLevel {
 		}
 	}
 
-	//TODO createItems will generate normal ones too =S
-
 	@Override
 	public int randomRespawnCell( Char ch ) {
 		return entrance()-width();
diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/builders/GridBuilder.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/builders/GridBuilder.java
index 808883ed2..a2039022c 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/builders/GridBuilder.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/builders/GridBuilder.java
@@ -61,27 +61,42 @@ public class GridBuilder extends Builder {
 		ArrayList<Room> toPlace = new ArrayList<>(rooms);
 		toPlace.remove(entrance);
 
+		//move the exit to the back
+		if (exit != null) {
+			toPlace.remove(exit);
+			toPlace.add(exit);
+		}
+
 		ArrayList<Room> placed = new ArrayList<>();
 		placed.add(entrance);
 
 		//use a sparse array to track room positions, with a mapping of x + 1000*y = cell
-		//this assumes that levels won't more than 1000 rooms wide
+		// and an index offset of 100,100 (x=y=100) to ensure we aren't dealing with negative indexes
+		//this effectively puts a limit of -99 < x < 999 and -99 < y < inf. on level sizes in rooms
 		SparseArray<Room> gridCells = new SparseArray<>();
-		gridCells.put(0, entrance);
-
+		gridCells.put(100_100, entrance);
 		for (Room r : toPlace){
+			int cellWidth = 1;
+			int cellHeight = 1;
+			//TODO this works on rigid multiples atm, would be nicer to buffer rooms that don't quite work
 			if (!r.forceSize(ROOM_SIZE, ROOM_SIZE)){
-				throw new RuntimeException("rigid room sizes for now!");
+				if (!r.forceSize(2*ROOM_SIZE-1, 2*ROOM_SIZE-1)) {
+					throw new RuntimeException("rigid room sizes for now!");
+				}
+				cellWidth = cellHeight = 2;
 			}
 			do {
-				Room n = Random.element(placed);
-				int nIdx = gridCells.findKey(n, true, Integer.MIN_VALUE);
+				r.neigbours.clear();
+				int[] keys = gridCells.keyArray();
+				int nIdx = keys[Random.Int(keys.length)];
+				Room n =  gridCells.get(nIdx, null);
 				int rIdx = nIdx;
-				switch (Random.Int(4)){
-					case 0:
+				//currently always pulls down and to the right
+				switch (Random.Int(10)){
+					case 0: case 4: case 5: case 6:
 						rIdx += 1;
 						break;
-					case 1:
+					case 1: case 7: case 8: case 9:
 						rIdx += 1000;
 						break;
 					case 2:
@@ -91,23 +106,31 @@ public class GridBuilder extends Builder {
 						rIdx -= 1000;
 						break;
 				}
-				//TODO negatives
-				int x = rIdx%1000;
-				int y = rIdx/1000;
+				//-100 to cancel offsets
+				int x = (rIdx % 1000) - 100;
+				int y = (rIdx / 1000) - 100;
 				r.setPos(x*(ROOM_SIZE-1), y*(ROOM_SIZE-1));
-				//TODO want to manually limit size probably
-				if (x >= 0 && y >= 0 && !gridCells.containsKey(rIdx)){
+				boolean valid = true;
+				for (int i = 0; i < cellWidth; i++){
+					for (int j = 0; j < cellHeight; j++){
+						if (gridCells.containsKey(rIdx + i + j*1000)){
+							valid = false;
+						}
+					}
+				}
+				if (valid){
 					if (r.connect(n)) {
 						placed.add(r);
-						gridCells.put(rIdx, r);
+						for (int i = 0; i < cellWidth; i++){
+							for (int j = 0; j < cellHeight; j++){
+								gridCells.put(rIdx + i + j*1000, r);
+							}
+						}
 					}
 				}
 			} while (!placed.contains(r));
 		}
 
-		//need a buffer room?
-		//contains an internal room, fills with
-
 		findNeighbours(rooms);
 
 		for (Room r : rooms){