Cardboard Tube Wall Marble Run

A bag of cardboard tubes, a roll of painter's tape and a handful of marbles turns a blank wall into an engineering project that grows for days.

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Ages 3-85 min prep

We started this on a rainy afternoon with three toilet rolls and low expectations. By evening the run reached the floor and my son had learned more about slopes than any worksheet would teach.

What I love is that it is never finished. Every day someone adds a tube, moves a corner, or decides the marble needs to land in a different cup.

Painter's tape is the hero here: it holds well, and it comes off the wall without taking the paint with it.

Test after every tube — that is where the thinking happens.

The whole kit: saved tubes, painter's tape, scissors and marbles.

Tubes taped down the wall with a cup at the bottom to catch the marble.

What you'll need

10-15 cardboard tubes (kitchen roll and toilet roll tubes, saved over a couple of weeks)
A roll of blue painter's tape (the low-tack kind that peels off walls cleanly)
Scissors — a grown-up cuts some tubes in half lengthways to make open chutes
A handful of glass marbles, or small balls if you have toddlers around
A plastic cup or small box as the landing station
A clear stretch of wall, a door, or the side of a wardrobe

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How to make it

1
Cut a few tubes in half lengthways so your child can see the marble travelling — mix open chutes with closed tunnels.
2
Tape the first tube high on the wall at a gentle downward slope. Anything too steep and the marble flies off the end.
3
Drop a marble in and watch where it lands. That landing point is where the next tube begins — this is the whole method.
4
Keep adding tubes downwards, testing after every single piece. The testing is the activity.
5
Add a challenge: a tunnel that turns a corner, a gap the marble has to jump, or a funnel made from a cut plastic bottle.
6
Put the cup at the bottom as the finish line and count how many marbles land in it out of ten.
7
Leave it up. Tomorrow it will be longer, and next week it will run around the doorframe.

Tip

Test the tape on a small patch of your wall first, especially on fresh paint. Marbles are a choking hazard for under-threes — use ping pong balls or small wooden balls instead and make the tubes wider. Start the run at your child's shoulder height so they can reach every part themselves.

Shop the look

Everything on the table

Blue painter's tape (4 rolls)Shop

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