abstract
| - During the 1993-1994 school year, Fred and George Weasley revealed and gave the map to Harry Potter so he could use a secret passage to get to Hogsmeade, since he didn't have a signed permission form, and Dementors were patrolling the boundaries. They said they acquired it from Argus Filch's Office during their first year at Hogwarts (the 1989-1990 school year). They demonstrated the map, showing seven secret passages leading to Hogsmeade, and which one was most likely known only by them. These 7 are:
* A passage beneath a one-eyed witch statue by the stairs to the Defence Against the Dark Arts classroom, leading to the cellar of Honeydukes. Tapping the hump with a wand and speaking aloud the word Dissendium to the witch makes the hump on the statue open just wide enough for a small person to slide down to the hidden passageway. No password seems to be needed to return to the school. Harry Potter used this twice to get to and from Hogsmeade in the 1993-1994 school year. There was no report of break-in at Honeydukes, and it is unknown whether Sirius Black used it when he broke into (or fled) Hogwarts Castle.
* A passage behind a mirror on the fourth floor, which was caved in as of 1993. It leads to Hogsmeade, but exactly where is unknown. Sirius Black mentioned that it was large enough for an organisation to hold a meeting inside.
* A passage beneath the Whomping Willow, leading to the Shrieking Shack. It was created for Remus Lupin to use during his school years so that he could isolate himself during his monthly transformations into a werewolf. Sirius Black may have used this passage to slip past the Dementors and get inside the school grounds during the 1993–1994 school year.
* A passage behind the statue of Gregory the Smarmy. Fred and George Weasley claimed to have found this secret passage during their first week at Hogwarts (likely before they acquired the Marauders Map).
* Three unspecified secret passages, apparently known to Argus Filch.
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