If you watch carefully in the ending, on Egad's doohickey, there's a button with a ghost on it, and a button with a boo on it. Egad pressed the ghost button after the Dark Moon was restored, and let out all the ghosts...

Methinks that design flaw will come around if there's a next game.

Am I the only one who thinks this game Darker And Edgier then the first game? Think about it, in the first game, King Boo just wanted to trap the bros. in paintings. Here, he wants to turn the bros. AND their friends into paintings AND take over the world! Just a thought...