In some kind of building-and-production games, player walks in the game world, kills enemies etc., then comes to some kind of his “castle” and gets into a building space where he can build foundries, fabrics and so on. But where is that building space placed for programmer, in comparison with the game world? Probably in the dungeon? Or vice-versa, in the celestiality? If second, how to switch off that area to place something in the game world? Is it possible to hide some actors ONLY in editor (the opposite to “Actor Hidden in Game”)? And won’t that celestial empire show itself if the user looks up? Or, maybe, the castle is placed on the separate level? If so, and this level has its own Game Mode, where there is placed the server for this level? Is it listening on the different port? And how is it synchronized with the main server? Can somebody clarify the situation?