1:87 Desk Racer
A playable micro-kart time trial in your browser on a coaster track across a real surface: a kitchen counter, a bookshelf or a bathroom sink. Three laps against the clock, a ghost of your best lap and four camera views.
Bring a surface and the objects the road climbs, spirals around or ducks under. The Skill returns a downloadable Skill (theme-driven game engine, course planner, CC0 props, verification) and three playable example games.
How it works
The meta prompt goes to your coding agent; it copies the reference game and edits only the theme: props at real size, the route, lights and copy.
The course planner turns the route into a track and checks it for kinks, steep slopes, clashes with props and leaving the surface.
Verify headlessly (a full lap, every prop visible, no network) and build one self-contained HTML file.
Frequently asked questions
Does it call any model or need a key?
No. The Skill gives your agent a prompt, lessons and a reference scene; the scene itself makes no network calls.
Why is the demo sandboxed?
The frame has an opaque origin and no network access, so the scene can’t read anything from this page or reach the internet.
Is it a racing simulator?
No. The kart follows a banked track spline with drift, boost and rails; it cannot leave the road or hit props. It is an arcade time trial.
Can I race on my own desk?
Yes. Describe the surface and the objects on it; your agent places them at real size and plans a route around them. Bring your own GLB models or use CC0 ones.
Does it work on mobile?
Phones get on-screen pedals and steering buttons. It has been verified under touch emulation, not on real devices.
Why is there no online generation?
Building a new scene needs a model key inside the sandbox, which the backend doesn’t support yet. Run the Skill with your own agent for now.