Butter Building - Stage 3
This rather small stage consists of three main areas. The first takes place in a bunched-up hallway that moves up-and-down past Bronto Burts on patrol.
The next area takes place on a tower balcony that either spins (in Kirby's Adventure) or fades in (in Kirby: Nightmare in Dream Land). The door appears after Kirby heads to the right.
The last area is split into two primary rooms, with lots of doors that will take Kirby between them. One of the doors leads to a separate cache containing a 1-Up. The stage exit can be found up top.