That's what I called it when I was a child anyway. It was a sectional set of plastic funnels and chutes and ramps that you could assemble however you liked, then put marbles in the top and watch them make their way to the bottom. It was always my favorite toy when I was little, and something I'd love to see around again.
I would have liked that marble thing too, but I didn't have one. My favourite toy was a Slinky.