There are lots of listings on Google with several examples.

It took me a lot of time to figure this one out when my son was interested. This is the term used in the US. They are usually made of wood or plactic and have little balls or marbles which the children roll down a maze-like structure. One can also use sand or water on some structures. Happy translating.

Smiles, ES

"marble run" ist definitiv auch der gängige britische Begriff