Go up a flight of stairs. At the top is a doorway-width opening, but no actual door. There's a dresser to the immediate right of the doorway, about two feet deep. There's a solid wall to the left of the doorway. Oh, screw it-- a picture will be easier:
I'm trying to find something that will let me keep the kittens in, but allow the adult cats to go in and out. I have a box there right now, and that worked well for a few weeks but now the little rascals have learned to climb over it. They can make it down the stairs OK, but not back up, so this is a problem.
Any suggestions for keeping the little buggers contained for a few weeks?