you cant Yoshi cant kill ghosts
In Mario Boos can become up to a whole room if you look at them to long and they don't breath. They are called balloon boos
Go to the same place where you went big boos balcony make sure you are Luigi and be invisible and then... go in the corner, jump in the boo painting, MAKE SURE YOU ARE INVISIBLE WITH LUIGI. And then, run around the eyeball-keep running until it gets smaller and then pops out a star. Good Luck!
You get Luigi in big boos haunt. To get to his painting you have to get the first stairs to unlock the stairs. Then you go back into big boos haunt go up the stairs goto the last door on the right. Jump on the ledge and, then jump on the '?' box then onto the higher ledge. Go through the door and, you see his painting jump in it. And complete the course. And defeat king boo at the end. To get Luigi's key.
The entrance to the secret room under the detention room is in the filing cabinet.
by the green cabnit and what is useful in the secret room is the bell clapper
first, go to the big boos haunt and go upstairs. go in the room farthest to the right. jump on the ledge and get the power flower. float up to the ledge and ground pound. go into the door you will see a luigi painting.
It is in the secret store room behind the filing cabinet in the detention room on Big Nate Island. You need the blue prints from Nate's locker in order to access the secret room.
After unlocking the red ! boxes, go to the castle courtyard. Punch the giant boo with the cage inside of him to enter Big Boo's Haunt. Obtain the first star by defeating all the Boos to get the staircase. In the second goal, as Mario, go up the stars and into the room with the single bookshelf. Use the fire flower to float up to the room above, where you'll find a Luigi painting. Jump through the painting and defeat Big Boo to get Luigi's key.
"After unlocking the red ! boxes, go to the castle courtyard. Punch the giant boo with the cage inside of him to enter Big Boo's Haunt. Obtain the first star by defeating all the Boos to get the staircase. In the second goal, as Mario, go up the stars and into the room with the single bookshelf. Use the fire flower to float up to the room above, where you'll find a Luigi painting. Jump through the painting and defeat Big Boo to get Luigi's key."
you climb up the rope
The clapper.