Its in the twins room in the treasure chest that appears once you kill the twins.
in the basment
walmart
trapped in a portrait on the final level of luigis mansion
Yes there will be a luigis mansion 2. Its called the elictric boogaloo
probably in the laundry room
you dont get luigi mansion in the day
Go to VidoEmo.com. there are plenty walkthroughs there.
poltergust 3000
no luigis mansion is on gamecube buy 1 they r cheap 30 $ or so
King Boo is the last boss
no one knows yet.
silly! its Luigis mansion