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You need to have at least 16 stars and have gotten the ! boxes solid. Then you have to be Mario. Go through the door that has no number or star on it in the lobby and follow the boo into the garden. Then kill the big boo and go inside the Big Boo's Haunt level. Then, go around the rooms killing all the ghosts, until a sign comes up saying something like 'Here comes the big boo, the master of haunts'. Then enter the lobby (where a star has appeared on your map) and a huge ghost appears. Kill him and then go up the stairs that appear and collect the Power Star (or just triple jump up). This will force you out of the level as usual, but then go straight back to the garden, kill the big boo again, go into the box and go up the new stairs that have appeared. Enter the last door on the right. Then go onto the wooden platform and use the power flower to float to the level above it (or just wall jump up). Then beat the level (which is sort of like a maze). First, when you are on the merry-go-round type maze, make a right, then make a left, make a right again, then make another left, then keep straight and go down the hole. Once you fall down the hole, you will see a mirror. If you are stuck here, then walk slowly to the mirror. You will see a reflection of Luigi, then you will see King Boo on your right. Beat King Boo using the mirrors reflection, but the second time you go to attack him, he is visible without the mirror, then you get the Luigi key.
hold L + R AND PUSH A

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9y ago

What else can I help you with?