It's pretty confusing to explain, but for example let's take turn based RPG's. You move around on the map and then you're transferred to the battle screen, while still keeping all the positions and stuff from the previous map-screen, to continue after victory. Now how should I approach that? Should I toy with persistence and simply switch rooms, or should I bring the whole thing into the current room, pausing and covering the stuff from the map scene? Same goes with menus - I'm in game- I can open menu, then switch between different screens (inventory/equipment/options etc.) - should I make it all in one room, covering the map-scene?