Big Builders
A construction site you run from the dirt up — get out of the truck, walk to a machine, climb in, and move the earth yourself.
Play it: bigbuilders.bmux.sh
What it is
A browser construction-site simulator with a job board, a yard of machines, and money. You start on foot with $750 and no job. Open the board, take one, then go and do it — walk up to an excavator or a dump truck, get in, and the controls become that machine’s controls.
That one rule does most of the work. You are a person on a site, not a cursor over it. Nothing is selected from a menu and teleported into place; if you want the excavator, it is over there and you walk to it. It costs about four seconds and it is the difference between operating a site and playing a spreadsheet with trucks on it.
Build mode, a machine list, a photo mode, a minimap, a compass and a speedometer round it out. The skyline on the horizon is going up at the same time, which quietly tells you what all this digging is for.
Who it’s for
It is pitched at kids, and the tells are deliberate. Soft painterly 3D with no sharp edges, a palette of yellow plant and green grass, every control on a labelled card along the bottom of the screen with its key printed on it. Nothing in it can be lost or failed. There is no timer.
What it does not do is talk down. The terrain actually deforms, the machines have real articulation, the money is real money, and a job is a job rather than a cutscene with a button. The simplification is in the interface, not in the simulation — which is roughly the opposite of how most children’s software is built, and the reason an adult can sit down with it without feeling managed.
Technical details
| Engine | Three.js, bundled with Vite |
| World | Deformable terrain, driveable plant, a city built in the distance |
| Loop | Job board → pick a job → walk to a machine → do the work → get paid |
| Modes | On foot, in-machine, build, photo |
| Platform | Any modern browser — no install, no account |