I love Roominate, a tiny room to wire up with working circuits that you build yourself.
Provide a girl with a buzzer and a motor, and she’s decided her room is a restaurant, with the motor serving as a fan to cool patrons and the buzzer being used by the chef when an order is ready.
If you make the tech easy enough, there is no limit to the things play can build.
Smart play doesn’t build things, it builds people.