I think you are looking for a design found in Projects. It was from Dainty Stitches. I have no idea if they still have it or not. The website owner here allows us to post embroidery found here and other places.
Hi Janette. The design is no longer available. Pinterest is only correct on the day of posting but then stays forever and causes confusion.
Not sure, but I got some mazes for marbles 3-4 years ago from Anita Goodesign. (Should still be available, they have all their old, old and newer old and new-ish and brand new designs!) Happy hunting!