Cellar BF (2)

As you enter this dusty dungeon, you'll immediately spot a Money Ghost inside a crate to your right. Remember to aim your vacuum high when you've shaken the crate to catch it right away.

You'll find two barrels in the room. Each barrel contains a set of three ghosts: an Orange Ghost, a Pink Ghost, and a Blue Ghost.

Notice the large piles of dust on the floor. You'll need to vacuum these up. It's best to do this before engaging the ghosts.

Under the leftmost pile of dust, you'll discover a converter that allows you to walk on the ceiling. There are two converters that lead back to the floor, and both have one of these ceiling converters above them.

Once you've defeated the two ghosts (one set from each barrel), the room will light up, and you'll receive a key. This key unlocks the room next to the Telephone Room on the 3rd floor, known as the Clockwork Room.

After checking the lamp and all the floors on the two shelves, and then catching the Boo (Booripedes, with 150 HP), you'll be ready to move on.