2048 × Jev
Instrumented 2048 web lab where every move is a Jev Choice over four directions, with probabilities, latency and cost shown live.
Overview
2048 x Jev hands every move of the game 2048 to Jev and shows its probability distribution, confidence, latency and token cost in the UI. The author says the goal is not a fun game but making it visible and measurable how context design affects a decision model.
Each turn is a single Choice over the four directions with no heuristic fallback, so every move is attributable to Jev. A user-set confidence threshold can pause play for human review. Prompts and board rules are editable, backends are bring-your-own-key, and game archives can be imported and exported. It ships a free-trial backend on Vercel and a static GitHub Pages build that calls it.
What the decision model decides
| Type | Question | Answers |
|---|---|---|
| Choice | Which direction should the board move? | up · down · left · right |
How it works
- Serialize the board and rules into state
- Ask Jev one Choice over four directions
- If confidence is below the user threshold, pause for review
- Otherwise apply the move and log probabilities, latency and cost
Strengths
- Every move attributable to the model (no fallback)
- Live view of probabilities and cost for prompt experiments
- Free-trial backend and bring-your-own-key options
- 76 unit tests run in the start script
Caveats
- Key sealing is explicitly not cryptographic protection
- Docs primarily in Chinese with an English README
Getting started
git clone https://github.com/ARCJ137442/jev-2048.git && cd jev-2048 && npm install && ./start.shAt a glance
- Type
- Project
- Status
- beta
- Language
- TypeScript
- Runtime
- Node server + browser
- Has code
- yes
- Has tests
- yes
- License
- MIT
Use cases and integrations
How curated lists describe it
Gaming: a 2048 board where every move is a Jev `Choice` over four directions with no heuristic fallback, gated by a user-set confidence threshold that pauses play for human review, with editable prompts and board rules, bring-your-own-key backends, and archive import/export.
yibie/awesome-jevThis project integrates Jev to provide structured decisions for its workflow. See the repository for implementation details.
logicrw/awesome-jev-projectsAn instrumented 2048 web lab where every move is a Jev (TypeSafe AI System One) Choice, with no heuristic fallback | 用 Jev 决策模型驱动每一步的 2048 网页实验台，概率、置信度、延迟与成本全部摊开可见，且刻意不做启发式兜底.
hellogumbo/awesome-jev
Frequently asked questions
Is there a fallback if Jev is unsure?
No heuristic fallback; a confidence threshold can pause play for a human instead.
Do I need a key to try it?
No, the hosted deployments include a limited free trial; local runs can use your own key.
What is it for?
Studying how context and prompt design change a decision model's choices.
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