Can you tell what a marble maze is I had a look at the site but have not seen before?
what a great idea,I will have to have a go at that one
Please let me know how it goes for you. I want to make one that you can run a gumball through and eat when you get it our the other side!
It can't be done as an ITH design, not in one go. There are two things you have do, 1 - sew the outline an then turn it right side out, and 2 - sew the lines of the maze. Would take more time and stabiliser than doing it on a sewing machine.