This is a room that appears if you need something. Walk by the entrance 3 times thinking hard of what you need. A doorway will appear and inside the room it will contain anything you need. The room of Requirements cannot produce food. If someone trys to get in after the doorway is sealed and wants to get inside they have to know exactly what the people before them needed. I have also included the mirror of Erised in the room of requirements.
Entrance of Room- (It must be opened to your use.)
Room of Requirements (inside)-
Mirror of Erised (you look in it and see your most wanted desire)