initial stab at disk 3 area.

Also made hidden items visible by default since they will become hidden when the game starts anyway. This way they are visible in the editor.

hidden_teleporter.tscn

@@ -25,7 +25,7 @@ animations = [{
 [sub_resource type="CircleShape2D" id="CircleShape2D_7k7bx"]
 radius = 9.0
 
-[node name="HiddenTeleporter" type="Node2D" unique_id=1201409437]
+[node name="HiddenTeleporter" type="Node2D" unique_id=1201409437 groups=["Hidden"]]
 script = ExtResource("1_52wed")
 
 [node name="Sprite2D" type="AnimatedSprite2D" parent="." unique_id=395479262]