I have hint brushes covering the openings on the outside of the castle (the door in the front, the two on the lower roof, and the two openings for the elevators). I also have hint brushes where the 2 base triggers are (the red and blue stripes on the ground). I decided to get rid of the smoke because even hint brushes wouldn't prevent it from coming through the wall. I am just gonna have a sorta spout there and the sound instead.