diff --git a/src/com/shatteredpixel/shatteredpixeldungeon/levels/CavesBossLevel.java b/src/com/shatteredpixel/shatteredpixeldungeon/levels/CavesBossLevel.java
index 974bc04c1..ec962d818 100644
--- a/src/com/shatteredpixel/shatteredpixeldungeon/levels/CavesBossLevel.java
+++ b/src/com/shatteredpixel/shatteredpixeldungeon/levels/CavesBossLevel.java
@@ -218,6 +218,7 @@ public class CavesBossLevel extends Level {
 		if (!enteredArena && outsideEntraceRoom( cell ) && hero == Dungeon.hero) {
 			
 			enteredArena = true;
+            locked = true;
 			
 			Mob boss = Bestiary.mob( Dungeon.depth );
 			boss.state = Mob.State.HUNTING;
@@ -245,6 +246,7 @@ public class CavesBossLevel extends Level {
 		if (!keyDropped && item instanceof SkeletonKey) {
 			
 			keyDropped = true;
+            locked = false;
 			
 			CellEmitter.get( arenaDoor ).start( Speck.factory( Speck.ROCK ), 0.07f, 10 );
 			
diff --git a/src/com/shatteredpixel/shatteredpixeldungeon/levels/CityBossLevel.java b/src/com/shatteredpixel/shatteredpixeldungeon/levels/CityBossLevel.java
index af267e6cc..254118971 100644
--- a/src/com/shatteredpixel/shatteredpixeldungeon/levels/CityBossLevel.java
+++ b/src/com/shatteredpixel/shatteredpixeldungeon/levels/CityBossLevel.java
@@ -176,6 +176,7 @@ public class CityBossLevel extends Level {
 		if (!enteredArena && outsideEntraceRoom( cell ) && hero == Dungeon.hero) {
 			
 			enteredArena = true;
+            locked = true;
 			
 			Mob boss = Bestiary.mob( Dungeon.depth );
 			boss.state = Mob.State.HUNTING;
@@ -199,6 +200,7 @@ public class CityBossLevel extends Level {
 		if (!keyDropped && item instanceof SkeletonKey) {
 			
 			keyDropped = true;
+            locked = false;
 			
 			set( arenaDoor, Terrain.DOOR );
 			GameScene.updateMap( arenaDoor );
diff --git a/src/com/shatteredpixel/shatteredpixeldungeon/levels/HallsBossLevel.java b/src/com/shatteredpixel/shatteredpixeldungeon/levels/HallsBossLevel.java
index cf25d47dc..8075a9a7e 100644
--- a/src/com/shatteredpixel/shatteredpixeldungeon/levels/HallsBossLevel.java
+++ b/src/com/shatteredpixel/shatteredpixeldungeon/levels/HallsBossLevel.java
@@ -167,6 +167,7 @@ public class HallsBossLevel extends Level {
 		if (!enteredArena && hero == Dungeon.hero && cell != entrance) {
 			
 			enteredArena = true;
+            locked = true;
 			
 			for (int i=ROOM_LEFT-1; i <= ROOM_RIGHT + 1; i++) {
 				doMagic( (ROOM_TOP - 1) * WIDTH + i );
@@ -205,6 +206,7 @@ public class HallsBossLevel extends Level {
 		
 		if (!keyDropped && item instanceof SkeletonKey) {
 			keyDropped = true;
+            locked = false;
 			
 			entrance = stairs;
 			set( entrance, Terrain.ENTRANCE );
diff --git a/src/com/shatteredpixel/shatteredpixeldungeon/levels/Level.java b/src/com/shatteredpixel/shatteredpixeldungeon/levels/Level.java
index cf8d74b53..f6d1f74e0 100644
--- a/src/com/shatteredpixel/shatteredpixeldungeon/levels/Level.java
+++ b/src/com/shatteredpixel/shatteredpixeldungeon/levels/Level.java
@@ -132,6 +132,9 @@ public abstract class Level implements Bundlable {
 	
 	public int entrance;
 	public int exit;
+
+    //when a boss level has become locked.
+    public boolean locked = false;
 	
 	public HashSet<Mob> mobs;
 	public SparseArray<Heap> heaps;
@@ -151,6 +154,7 @@ public abstract class Level implements Bundlable {
 	private static final String MAPPED		= "mapped";
 	private static final String ENTRANCE	= "entrance";
 	private static final String EXIT		= "exit";
+    private static final String LOCKED      = "locked";
 	private static final String HEAPS		= "heaps";
 	private static final String PLANTS		= "plants";
 	private static final String MOBS		= "mobs";
@@ -256,6 +260,8 @@ public abstract class Level implements Bundlable {
 		
 		entrance	= bundle.getInt( ENTRANCE );
 		exit		= bundle.getInt( EXIT );
+
+        locked      = bundle.getBoolean( LOCKED );
 		
 		weakFloorCreated = false;
 		
@@ -308,6 +314,7 @@ public abstract class Level implements Bundlable {
 		bundle.put( MAPPED, mapped );
 		bundle.put( ENTRANCE, entrance );
 		bundle.put( EXIT, exit );
+        bundle.put( LOCKED, locked );
 		bundle.put( HEAPS, heaps.values() );
 		bundle.put( PLANTS, plants.values() );
 		bundle.put( MOBS, mobs );
diff --git a/src/com/shatteredpixel/shatteredpixeldungeon/levels/PrisonBossLevel.java b/src/com/shatteredpixel/shatteredpixeldungeon/levels/PrisonBossLevel.java
index beeb1c16c..0f85550dd 100644
--- a/src/com/shatteredpixel/shatteredpixeldungeon/levels/PrisonBossLevel.java
+++ b/src/com/shatteredpixel/shatteredpixeldungeon/levels/PrisonBossLevel.java
@@ -309,6 +309,7 @@ public class PrisonBossLevel extends RegularLevel {
 		if (ch == Dungeon.hero && !enteredArena && roomExit.inside( cell )) {
 			
 			enteredArena = true;
+            locked = true;
 		
 			int pos;
 			do {
@@ -326,6 +327,7 @@ public class PrisonBossLevel extends RegularLevel {
 			set( arenaDoor, Terrain.LOCKED_DOOR );
 			GameScene.updateMap( arenaDoor );
 			Dungeon.observe();
+
 		}
 	}
 	
@@ -335,6 +337,7 @@ public class PrisonBossLevel extends RegularLevel {
 		if (!keyDropped && item instanceof SkeletonKey) {
 			
 			keyDropped = true;
+            locked = false;
 			
 			set( arenaDoor, Terrain.DOOR );
 			GameScene.updateMap( arenaDoor );
diff --git a/src/com/shatteredpixel/shatteredpixeldungeon/levels/SewerBossLevel.java b/src/com/shatteredpixel/shatteredpixeldungeon/levels/SewerBossLevel.java
index 100c7a937..fae9006c8 100644
--- a/src/com/shatteredpixel/shatteredpixeldungeon/levels/SewerBossLevel.java
+++ b/src/com/shatteredpixel/shatteredpixeldungeon/levels/SewerBossLevel.java
@@ -232,6 +232,8 @@ public class SewerBossLevel extends RegularLevel {
 	
 	public void seal() {
 		if (entrance != 0) {
+
+            locked = true;
 			
 			set( entrance, Terrain.WATER_TILES );
 			GameScene.updateMap( entrance );
@@ -244,12 +246,15 @@ public class SewerBossLevel extends RegularLevel {
 	
 	public void unseal() {
 		if (stairs != 0) {
+
+            locked = false;
 			
 			entrance = stairs;
 			stairs = 0;
 			
 			set( entrance, Terrain.ENTRANCE );
 			GameScene.updateMap( entrance );
+
 		}
 	}