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FINAL BOSS: KING BOO
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When the boss battle starts, it'll look like you're
fighting Bowser, not King Boo, but you'll see what's
going on in just a second.
Dodge "Bowser's" fire attack. When he shoots out spike
balls, avoid getting hit by those too, but suck one up
with your vacuum and shoot it right at Bowser's stomach.
His head will pop off, and you'll see that this is really
King Boo in a Bowser costume. King Boo will circle
around the arena shortly, at which point you can start
subtracting from his - you ready for this? - 500 HP!
Then, he'll go back into his costume.
Repeat this process to beat him, but let me tell you, it
could be no farther from simple; it's pretty darn close
to impossible IMO.