Cardboard box marble run

What you need

• A large cardboard box
• Cardboard tubes
• Sticky tape and scissors
• A marble or small ball

How to do it

1. 1

   Stand the box on its end so you have a tall back wall.

2. 2

   Tape a first ramp near the top with a gentle slope.

3. 3

   Test with the marble, then add the next ramp where the marble lands.

4. 4

   Keep going to the bottom, adding tubes, tunnels and a catch cup.

5. 5

   Time the run, then change one slope and see if you can make it slower.

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