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get like 18 stars go to the basement go to the door next to the ghost and ho to the back yard do you see the big ghost kill him then jump in to that lantern thing
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."
Keep killing the boos that appear out of the pictures in the wooden circular platform, ground pounding them is easiest i think. once u killed 3 boos a giant boo will appear punch him from behind or ground pound him 3 times each. Each time you hit him he will go faster. He also causes 3 slices of power meter damage so be careful. When you kill him the star will appear. Also watch out for the flames coming out of some of the pictures!
You can either do a mission were big smoke and sweet are with you or you can kill big smoke later on in the game