|Underground Switch Palace|
|Hack||Luigi's Mansion 64.5|
|Number of Stars||0|
|Music Used||Super Mario Sunshine - Warp Zone|
|Stage or HUB Level is located in||Mystic Cave|
Underground Switch Palace is a secret course in Luigi's Mansion 64.5 that contains the Ghost Cap's ! Switch, Iron Cap's ! Switch and Wing Cap's ! Switch. The entrance is located in Mystic Cave, behind a set of double doors in the underground lake area.