You can still buy these actually, so you should.
Basically, it was a battery-operated stairs-and-slide combination, with an escalator in the middle with a slide weaving around it. Only small, and on it were three penguins who went up the escalator, then slid down the slide again. Incredibly simple, with no real purpose, but it remains my favourite toy from my childhood. I had two back then and last year I found one for sale and my mother bought it for me as a birthday present.