No, you don't just use Mario. I wish it was that easy. I restarted on a different file, and you can get that star if you do it before beating Bowser the first time.
So, I'm basically screwed unless someone can PLEASE tell me what to do! (see Boo question by Psyqo)
PS: thanks for trying Luigi number one.
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Take a deep breath. You might have not gotten all the secret castle stars. Have you got the eight shining rabbits because they also give you a star, after you catch the last one he will say the regular things and give you a key. The key opens one of the doors leading to the Rec Reoom. I hope this helps and please answer my question because I got 148 stars!
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