TSR – Objects, Miscellaneous: Functional Playhouse Door by RAVASHEEN.
This is a base game compatible object usable by both toddlers and children. It is a “door” that you can place on any wall so you can build your own playhouse however you want! You can build a tree house or make a small play house indoors – the sky is the limit!
Up to 4 sims can play in it at one time. Any sims playing in it together will build relationships while also increasing fun and social stats. This can be used autonomously or by directing your sim to play in it.
While playing behind the curtains the sims stand still, so there are no animations during the action itself. So it is best to build something so you can’t see the inside while they play.
This also works like a door when you aren’t using it as a play house, so your sims can access anything behind it and walk through it as if it were a door.