diff --git a/game/hud/layer.rb b/game/hud/layer.rb
index 21ef28d..9c108ba 100644
--- a/game/hud/layer.rb
+++ b/game/hud/layer.rb
@@ -7,6 +7,7 @@ class HUDLayer
   def initialize
     @hud_bg = Gosu::Image.new("assets/images/hud.png", retro: true)
     @hud_fg = Gosu::Image.new("assets/images/hud_fg.png", retro: true)
+
     @inventory = Inventory.new
     @health = HealthBar.new(100)
     @logs = GameLogger.new
diff --git a/utils/bus.rb b/utils/bus.rb
index 25dd8c6..0513173 100644
--- a/utils/bus.rb
+++ b/utils/bus.rb
@@ -17,21 +17,6 @@ class EventBus
     @events[event] << { callback: callback, owner: owner }
   end
 
-  # Subscribe to an event that should only be called once
-  def once(event, owner = nil, &callback)
-    wrapper = nil
-    wrapper = proc do |*args|
-      callback.call(*args)
-      off(event, &wrapper)
-    end
-    on(event, owner: owner, &wrapper)
-  end
-
-  # Unsubscribe from an event
-  def off(event, &callback)
-    @events[event].reject! { |h| h[:callback] == callback }
-  end
-
   # For events that return a value (e.g. queries), get the first non-nil response
   def get(event, *args)
     @events[event].dup.each do |h|
diff --git a/utils/maze.rb b/utils/maze.rb
index a6b8aac..34e4d09 100644
--- a/utils/maze.rb
+++ b/utils/maze.rb
@@ -7,6 +7,7 @@ class MazeData
 
     @boss_rooms = []
     @start_room = nil
+    @exit_room = nil
 
     crate_rooms!
     carve_passages_from(0, 0)