From the Super Mario Wiki, the Mario encyclopedia
Shroomlock House is a location in Mario Party Advance. It is located in the Town Area of Shroom City. The visited area seems to be the kitchen and dining area, with the background being a strong yellow accented by blue furniture and a purple tablecloth on the table. As no quests bring the player here, it is entirely optional to visit it. Regardless, if the player stops here, they meet Mrs. Shroomlock, the wife of detective Shroomlock. She makes small talk with the player, which includes providing clues on various quests.
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