v1.3.0: fixed exploits that let DM-300 dig outside of its arena

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/mobs/DM300.java

@@ -579,9 +579,12 @@ public class DM300 extends Mob {
 				for (int i : PathFinder.NEIGHBOURS9){
 					if (Dungeon.level.map[pos+i] == Terrain.WALL || Dungeon.level.map[pos+i] == Terrain.WALL_DECO){
 						Point p = Dungeon.level.cellToPoint(pos+i);
-						if (p.y < gate.bottom && p.x > gate.left-2 && p.x < gate.right+2){
+						if (p.y < gate.bottom && p.x >= gate.left-2 && p.x < gate.right+2){
 							continue; //don't break the gate or walls around the gate
 						}
+						if (!CavesBossLevel.diggableArea.inside(p)){
+							continue; //Don't break any walls out of the boss arena
+						}
 						Level.set(pos+i, Terrain.EMPTY_DECO);
 						GameScene.updateMap(pos+i);
 					}

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/CavesBossLevel.java

@@ -101,6 +101,7 @@ public class CavesBossLevel extends Level {
 	private static int WIDTH = 33;
 	private static int HEIGHT = 42;
 
+	public static Rect diggableArea = new Rect(2, 11, 31, 40);
 	public static Rect mainArena = new Rect(5, 14, 28, 37);
 	public static Rect gate = new Rect(14, 13, 19, 14);
 	public static int[] pylonPositions = new int[]{ 4 + 13*WIDTH, 28 + 13*WIDTH, 4 + 37*WIDTH, 28 + 37*WIDTH };