Story 31 · Book Three
Hollow Wall
Knock on the back wall while the Up-Down is moving, and get a knock back on every floor.

The game begins here
Start with a sound.

Listen in The Up-Down
Nine seconds between floors, every time.
The line that comes back“Knock while it moves. A knock every floor.”
This page introduces the story. The complete read-aloud is in Book Three, The Green Door.