A few days ago I pulled out the cardboard houses and put them in the center of the living room.
Wylla loves to hide inside the houses and wait for an unsuspecting Kibblesmith to walk by so she can give them a BOOP with her paw, or pounce at them through a window or door.
If they come knocking on the door, she'll let them in, but usually there's a slap fight or a wrestling match on the doorstep first.
They've figured out all sort of games to play in the houses, and seem to really enjoy themselves. It's highly entertaining to watch them, too!