Play prototypes

Three small prototypes about playing with bricks and a screen. I built each one to answer a single question, and they all run in a phone browser. Each has a page of notes: what I checked, what I don't know yet, and how I'd test it with children.

A red brick car driving up a board onto a stack of books
01

Rolling Machines

Draw a car, change it brick by brick, and test it on table-top courses made of books, a ruler and a box. The physics runs on exactly the bricks you see.

Question: will children rebuild and try again when the test shows them why it failed?

A brick plate with a volcano, lava, a lake, trees and small houses
02

Living Plate

Every brick colour is a rule. Water runs downhill, seeds grow where it is wet, lava burns whatever it reaches. Build a wall in time and the village is safe.

Question: do simple rules make children build whole worlds instead of single objects?

A grey brick plate with coloured bricks and a yellow bar moving across it
03

Brick Beats

Left to right is time, low to high is pitch, and the colour picks the instrument. Build while it plays and you hear each brick as you put it down.

Question: does making music with bricks feel like play? (Turn the sound on.)

Where they could go

Each one answers a single question today. If the answers are good, this is the direction. The notes pages have the detail.

How I test and change them

The same loop runs for all three. Steps 1 to 3 are done for each prototype. Steps 4 to 7 come next, and each notes page has the details for that prototype.

1Ask one question. Write it so a play session can answer it, and decide before building what a yes looks like.
2Build the cheapest version that can answer it. Rules on a screen before a camera, a side view before full 3D. Anything the question doesn't need stays out.
3Check it myself. The rules are written as tests, I play it by hand on a laptop and a phone, and I look at screenshots of each moment to catch what reads wrong. Whatever I can't check this way goes on the notes page as unknown.
4Adults first. Three to five adults, thinking aloud. They find the confusing parts, so the sessions with children test the idea and not the interface.
5Children, watched and not taught. Short sessions with a parent in the room, one line of instruction, then I only watch. I note what children do (what they change, when they retry, what they build on an empty plate) more than what they say.
6Change one thing. After each round, one change aimed at the weakest moment, then the same session again. If two rounds bring no progress on the question, the prototype stops there.
7Check against real bricks. Anything the screen simulates gets measured with real parts: how far a pull-back car really goes, and whether a phone can read a real plate.

Living Plate and Brick Beats are meant for a real baseplate under a phone camera. The camera part isn't built yet, so for now you build on screen, with the same rules.

Why I made these

After reading the Principal Play Prototyper posting at LEGO Digital Play, I got really excited about the job and started thinking about what I could add to the team, even from outside it. These prototypes are what came out of that, and this link goes with my application.

So I worked the way the posting describes the job: start from a question, build the fastest thing that can answer it, and be clear about what it shows and what it doesn't. Each prototype here asks one question about how children play with bricks and a screen.

The posting talks about turning napkin sketches into play-testable prototypes. I took that literally for Rolling Machines: it starts from a sketch, and the game turns it into a machine you can test and then build for real.

The idea of starting from a drawing is older. At the Küçükköy Creative Technologies Workshop I worked with children aged 8 to 12. They drew robots together, and I 3D-modelled and printed their drawings. Rolling Machines grew out of that moment, when a child's drawing becomes something you can build.

When

The first week of November 2026. Rolling Machines was built on the evening of 5 November, Living Plate and Brick Beats later the same night.

What they are, and what they aren't yet

They run in a browser, on a laptop or a phone. I checked each one with tests and by playing it by hand, and each has a notes page on what I checked and what I still don't know. No child has played them yet. That comes next, and the way I'd run it is further down this page.

I enjoyed making these. Whether I join the team or not, the team is welcome to use anything here; that's fine by me.

A personal project, not made, endorsed or affiliated with the LEGO Group. LEGO is a trademark of the LEGO Group.