OK, here we go, I just remembered a game, but I don't have the slightest idea what it was called.
I'm pretty sure it has "marbles" in its name. It had pretty decent graphics and was about rolling marbles down some "parcour" (not these isometric thingies, like Marble Madness), but I can't remember what exactly was the goal of the game.
I think it was for Windows. As far as I can recall, the game shouldn't be that old and I don't think it will be Abandonware already, but one can hope
I'd be glad if anyone could help me out here.
Edit:
I already did a Google and Mobygames search, but it turned out no decent results, just that you know.