There is no build video on this Flearn on purpose. Using the materials provided (foam, wood, wood slats, cardboard, and so on) create something that when you drop a marble in the top that exactly 10 seconds later the marble hits the table. You cannot touch the box or any part while the marble is in the box.
Look at your workbook for more information and how the grading works.
Look at your workbook for more information and how the grading works.