Marble Run Building
| Min number of participants | 1 |
| Age | 8+ yrs. |
| Safety support by adult | Not required |
| Min duration | 45 min. |
| Cost | Low |
| Environment | Indoor |
Stack tubes, cups, and cardboard tracks into a twisting marble run, then test and rebuild it until the marble makes it all the way down. A hands-on mix of engineering and trial-and-error fun at home.