Hidden Secret Treasure Rooms
In the Mansion there are 2 Secret Treasure Rooms in the Mansion which when accessed, yield a lot of Treasure. These rooms are the Hidden Room (accessible starting in Area 2) and the Sealed Room (accessible from Area 4).
Hidden Room:
In the top-right corner of the Butler's Room is a mousehole. Search it with the GameBoy Horror to access this room. You will leave the same way.
Sealed Room:
Climb the right-most chimney on the roof and head inside it to access this room. To leave, uncover the mirror and use the Mirror Warp trick.
More tricks, tips and cheats for this game are right here - Luigis Mansion cheats
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