The Room of Requirement is a room on the seventh floor of Hogwarts castle that has a hidden entrance opposite the tapestry depicting the attempt of Barnabas the Barmy to teach trolls ballet. The way to open the room is to walk past it three times thinking about what you need, and the door will appear. Its most notable role in the Harry Potter canon is as a meeting place for Dumbledore's Army.

PPC agents have on occasion found and used the Room of Requirement; they seem to find it more often than the usual Hogwarts student might, probably because they know what they're looking for and how to get there.

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