You go to marios island and go to the piantas shop and purchas Luigis flashlight then you Luigis mansion will appear on the map but you can't enter it in the day time. you have to switch it to night to play on it.
You need to buy Luigi's Flashlight in Mario's Stadium shop and it has to be night.
you dont get luigi mansion in the day
trapped in a portrait on the final level of luigis mansion
you go to marios island and go to the piantas shop and purchas luigis flashlight then you luigis mansion will appear on the map but you cannot enter it in the day time. you have to switch it to night time to enter then a secret shop notice appears but shh its a secret.
probaly unlock night time on Mario sluggers
mario 3d land
no one knows yet.
silly! its Luigis mansion
in the room just north to the butlers room, its in the washer
you cant go inside
turd
He does not have a yacht.
You have to buy the flashlight at the shop located in Mario's stadium. But you can only play the stage at night-time. Sorry I don't remember how to unlock night-time but I think you you unlock it by beating bowser Jr.