King Boo Down Below
Once you clear the Cellar, the key leads upstairs. If you want, go through the door into the basement hallway where there is a door at the back. Open the door. Then you walk through the curvy path and you will see King Boo's Crown and if you try to grab it, King Boo comes out and is saying something like, "how did you get out of my!!! Hey wait your Luigi!" then he blasts you back to the foyer.
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