G1 Racer

Six simulated Unitree G1 robots race through one MuJoCo world in your browser, all driven by a single batched Metatron policy. It is a simulation game with movement assists, not a real-robot controller.

Note

The bundled motion assets — the jump reference, the gait cycles and the recovery pose plan — are demo-only data, included so the game runs; they carry no standalone redistribution or reuse rights. Publishing the compiled game grants no additional rights to them.

Playing

Open G1 Racer and click Start race. No Python, account or install is needed. On the first visit the page downloads about 403 MB of policy weights from Hugging Face. After the first verified download the browser keeps a copy in its own site storage, so later visits in the same browser normally start without downloading again; a different browser, cleared site data, or the browser evicting the copy downloads it again, and a stored copy is re-verified before use. WebGPU gives the best experience; a slower CPU/WASM path runs where WebGPU is unavailable.

You control Green, marked by an overhead arrow; the other five robots are AI. After a short 3-2-1-GO countdown, use WASD or the arrow keys to drive, Space to jump, Q to throw a held item, R to respawn in place (a three-second penalty), and P to pause. Drive over floating ? boxes to pick up a throwable Ball or Oil. Speed-arrow pads boost you, and clean jumps and gap crossings grant a brief speed bonus. A fallen robot tries to get up on its own and is rescued back onto the track if it stays stuck. Leaving the road runs you into physical gravel, and marked zones lower gravity.

To keep the race fair, the game smooths each robot’s measured speed over about two seconds and never lets a robot be asked to go more than one metre per second above that smoothed speed. It only limits the request; it never brakes, steers or pushes a robot directly.

How it runs

The policy weights are fetched from Hugging Face at a pinned, immutable revision and verified by SHA256 before use, with no login or token. The compiled observation code travels inside the game bundle. The browser loads these assets and initialises its device-specific runtime at startup; it does not export or rebuild anything.

Licensing

The game’s own code (compiled JavaScript, WebAssembly and CPython bytecode) is licensed under Apache-2.0. The policy weights are not bundled; they download from Hugging Face under the NVIDIA Open Model License. The bundled motion assets are demo-only data, as noted above. Browser code and weights remain downloadable and inspectable; this is not encryption or DRM.

See demos/g1-racer/README.md to run the game locally. Maintainers of the development repository have a separate note on how the bundle is rebuilt and verified.