It could work if you undid a few stitches. I made a crayon roll work for my makeup by undoing some of the rows.
Yes, I bumped into the same wall. It's a cute design but rather frustrating for the mouse :)
I could make one of my labyrinths suitable for a marble, problem would be the size.
It seems that this would work if there were fewer lines to allow for more width between each row. The 5X7 seems like an agreeable size. Nice project for the future. I'm finishing my finger puppets today. Thanks for your designs in that regard...