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4751 Harry and the Marauder's Map is a Harry Potter set released in the year 2004. It is a recreation of the scene in Harry Potter and the Prisoner of Azkaban where Harry Potter sneaks through the One-Eyed Witch Passage in Hogwarts to Honeydukes Sweets Shop in Hogsmeade.
The set contains a Hogwarts corridor and an underground passage the entrance to which is guarded by a statue. You reveal the hidden passageway by inserting a wand into a Technic brick. This releases a locking mechanism so the statue's platform slides back, creating a passageway that a minifigure can fall through to reach the area below. The set comes with an orange spider, a green plant piece, and the Marauder's Map tile.
The minifigures included are Harry Potter in his Invisibility Cloak, Professor Snape, and the Humpbacked Witch Statue. The version of Snape and Harry found in this set, as well as the Humpbacked Witch Statue in general, are all exclusive to this set.