Some of the best non-human characters in Mario aren't just those that are animals, but also those that are ghosts. King Boo is the leader of the mischievous ghosts that tend to torment Luigi most ...

At 932 pieces, King Boo's Haunted Mansion is one of the bigger expansion sets in the Lego Super Mario line. It already offered pretty solid value in terms of how many pieces you get for $75.