Marble Maze

This is a challenge that benefits from:

1) sketching out a plan beforehand, and

2) being ready for "trial and error".

So, get out a pieces of paper, collected your supplies and get ready to engineer!

Your base can be anything . . . a paper plate, a shoe box/lid, a cereal box with the side cut off, etc.

Oh, and obstacles are encouraged as part of phase 2;)