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The East Gallery is a room in Treacherous Mansion in Luigi's Mansion: Dark Moon. It is accessible via the right door in the Front Entrance or the left door in the Jungle Exhibit, and connects the two rooms together.
The room itself has a long carpet leading up to the Jungle Exhibit door, as well as a safe in the wall that can be opened with a Strobulb flash to get some money. Mice sometimes appear as enemies when the room is dark.