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A Crossy Road clone in the browser: play it yourself or watch Jev (TypeSafe) play it in real time.
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- Last pushed
- Updated Oct 2026
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CommunityJev Demos & Experiments
Crossy Road Jev
A browser Crossy Road clone where you play with keyboard or touch, or hand the controls to Jev (TypeSafe jev-latest) and watch it play live. Jev reads a structured screen description, never pixels, and picks one of five actions.
- Stars
- 0
- Language
- JavaScript
- Reading time
- 2 min
- Published by
- Community
- Author
- FLX-20
- Last verified
- Oct 2026
Used inJev for Gaming
- Languages
- JavaScript
- Platforms
- Browser
- Capabilities
- Open sourceRequires API key
Highlights
- Voxel 3D in the browser with Three.js, an orthographic camera at the original's angle, shadows, squash-and-hop and per-cause death animations.
- One deterministic simulation in core/ is shared by the browser and the server; a run is fully described by its seed and moves.
- Jev gets an accessibility-tree-like description of the screen and chooses one of five actions; nothing is pixel-based.
- The world keeps moving while Jev thinks, so both its decisions and its speed count.
- Needs Node.js 22.9 or newer; a TypeSafe API key is required only to watch Jev play, not to play yourself.
Quickstart
bash
npm install
cp .env.example .env
npm startWatch out
README reviewed 2026-10-17; the repository lists no license and the captured README stops mid-sentence, and no win rates, reaction times or human-versus-Jev comparisons are published.
Questions about this entry
Short answers drawn from the linked project or page.
A Crossy Road clone that runs in your browser. You can play it yourself with keyboard or touch, or watch Jev, the TypeSafe jev-latest model, play it in real time while the world keeps moving.
It receives a structured, factual description of the screen, like an accessibility tree for the game, and chooses one of five actions. Nothing is pixel-based, so it never looks at rendered frames.
Clone the repository and run npm install, copy .env.example to .env and paste your key after TYPESAFE_API_KEY= if you want to watch Jev play, then run npm start and open http://localhost:3000.
Only to watch Jev play. You can play yourself without one; the README says .env is git-ignored so the key stays on your computer.
The world keeps moving while Jev thinks, so a slow decision is still a decision made late; the project treats both the quality of decisions and the speed of them as part of the challenge.
One deterministic simulation in core/ is shared by the browser and the server, and a run is fully described by its seed and its moves, which keeps replays exact.
It is FLX-20's JavaScript repository, created and last pushed 2026-10-12 with no stars or forks and no license listed; the README documents setup but publishes no scores.
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