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.

more bashful Boo, along with Dry Bones and a yellow baby Yoshi. As with other expansion sets, you’ll need one of the original Mario, Luigi, or Peach starter set figures to fully experience this one.