Radio Shack 150 in 1 Project Kit Box (1976?)
My, how far we've come. Kids these days are messing around with microcontrollers. So do I, but I wish I'd had them back then. We had to make do with electronic bird chirps and by gum that was good enough for us.
But had there been such a thing back then as Robot Legos I'd have killed - killed! - to get my hands on them.