Cardboard marble run

How to make it

1. 

   1

   Split the tubes

   Grown-up step: cut some tubes in half lengthwise with a craft knife to make open chutes.

2. 

   2

   Stand up the board

   Lay the box flat against a wall or lean it on a chair. That's your run's back wall.

3. 

   3

   Tape the first chute

   Tape a chute near the top, tilted down a little.

4. 

   4

   Zigzag down

   Tape the next chute below the end of the first, tilted the other way. Keep going.

5. 

   5

   Test as you build

   Drop a marble after each new piece. Fix any spot where it flies off.

6. 

   6

   Add tricks

   Add a full tube tunnel, a drop through a hole, or a cup at the bottom to catch it.