From the Super Mario Wiki, the Mario encyclopedia
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The Boo areas are spaces that first appear in Mario Party 10, only on the board Haunted Trail. If the player passes one, they will start being haunted by a Boo and lose five Mini Stars for each turn. Only two of these spaces appear on the entire board, one of which is present midway to the first Boss Battle Space, and the other of which is not long after said Boss Battle Space.