DULO Stairs is a furniture piece building in the 'Build-a-room' series for the Room set. Attach to other rooms, tunnels and stairway that are available as FURNITURE in the catalog, so you can mix and match, put as many rooms as you want, connected with tunnel or stairs or another room. Move them around, up or down ... connect as many as you like. There are 3 stories. Main room is necessary.