A marble run with a spiral, a tunnel, a jump and a landing cup.
Materials
- 6 big delivery boxes
- 1 roll of tape (gone)
- Hot glue (with a grown-up)
- 1 marble (plus 3 lost marbles)
The engineering bit
Flat cardboard bends. Cardboard folded into triangles does not. That one idea saved the whole tunnel.
Next version
I want to add a lift that carries the marble back to the top so it never stops.