Barbie & Skipper: Game Room (CIB, Mattel, 80s)

Okay, I've got so many questions; First of all, since when do Barbie and Skipper live together? Also, they have a GAME ROOM?? Where?! I know they live in a huge mansion, but I've never seen this game room before. Did they expand? Is it a secret basement area? Did they get the right permits for it? Man, a playset like this, can really make a person wonder. Condition : Good, complete in box (we've throughly checked, but forgot to take pictures of out of the box.)