User repository on GitHub
Jev play Tetris in real-time against other AI models
- Forks
- 7
- Last pushed
- Updated Oct 2026
Repo stats from the GitHub API, cached Oct 2026.Homepage
CommunityJev Demos & Experiments
Jev Tetris — trungdq88
Live versus Tetris where Jev faces Claude Haiku 4.5, Gemini 3.8 Flash, or local open-weight Laya on the same seeded piece sequence; cleared lines arrive as garbage rows and the first to top out loses.
- Stars
- 19
- Language
- JavaScript
- Published by
- Community
- Author
- trungdq88
- Last verified
- Oct 2026
About this project
Two AI models play Tetris against each other in real time. Jev, TypeSafe's System One model, faces Claude Haiku 4.5, Gemini 3.8 Flash, or Laya, an open-weight typed-decision model running on your own machine. Same piece sequence, same options, same clock. Every line you clear lands on your opponent's board as a garbage row. Whoever tops out first loses.
Quoted from the project's README. Read the full README.
Works forJev for Classification
Used inJev for Software & DevTools
- Languages
- JavaScript
Highlights
- Same seeded sequence and shared gravity for both sides, with missed deadlines locking pieces in place.
- Choice over enumerated legal placements for Jev and Laya, forced place_piece call for API opponents.
- Live stats per board for lines, latency, missed deadlines, tokens, and cost per move.
- Extra modes for solo play, human-versus-Jev, lockstep comparison, and a present layout for recordings.
Watch out
Needs a TypeSafe key plus an Anthropic or Gemini key for hosted opponents; Laya needs its local server on localhost. Gravity and versus toggles change whether speed or placement quality is compared. Copy reviewed against the repository README on 2026-10-04, not from running it.
Questions about this entry
Short answers drawn from the linked project or page.
Yes, in versus mode with gravity on. A late answer locks where the piece is, and near the top there are only a few rows to fall. The wait-for-answers toggle removes gravity so only placement quality is compared.
Code enumerates every legal placement with lines, holes, height, and surface described in words. Jev and Laya answer a Choice over those options; API opponents call place_piece with the same option enum. Laya gets six pre-ranked options because its context is only 512 tokens.
Yes, play.html puts you on the left and Jev on the right with shared pieces, rising gravity, and garbage rows. Arrow keys move, up or X rotates, Z rotates back, down soft-drops, space hard-drops, with ghost piece and lock delay. Only a TypeSafe key is needed.
Yes, present.html is a best-of-N layout with tall boards, round clock, and round list. Each round draws a fresh shared seed, rounds chain after a pause you set, and query params pre-fill opponent, rounds, gravity, and seed.
In the reported versus runs Jev spent about $0.0035 to $0.005, Gemini 3.8 Flash about $0.008, and Claude Haiku 4.5 about $0.053. Per move Jev costs roughly 20x less than Haiku because its input tokens are cheap and its output is free, while Haiku bills both directions.
Laya is an open-weight 421M-parameter ModernBERT encoder trained on typed decisions in other domains, not Tetris. Its probabilities over the six candidates are nearly flat (entropy confidence 0.01 to 0.1), it prefers whichever options are listed first, and it does not favor the four-line clear; unlimited time lasts about 50 pieces, and in real time Jev's garbage plus its think time end it in seconds.
Jev needs a TypeSafe key, and the hosted proxy stores nothing; the LLM opponents need an Anthropic or Gemini key. Laya needs no key at all, just its local server on http://localhost:8765 started with tools/laya_server.py, which a browser can reach even from the hosted page.
Other listings of this project
Forks and copies of this project in the directory. This entry is the canonical one.
1GitHub stars
A Streamlit Tetris where the engine enumerates every legal placement, Jev picks one typed placement ID, and Python verifies rotation, column and exact occupied cells before the piece is allowed to lock.
Jev Demos & Experiments#community#jevbest#catalog-import
More Jev resources like this
30GitHub stars
Side-by-side game harness where Laya running locally and Jev over API answer the same typed questions for snake, kombat, runner, flappy, tetris, and human-versus-model matches.
Jev Demos & Experiments#community#jevbest#catalog-import
21GitHub stars
Browser top-down driving sim that sends sensor JSON to Jev every 200ms with four typed driving questions in one call, then applies confidence gating and reflex rules to steer.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
vinilana/live-jevJavaScript
vinilana/live-jevJavaScript12GitHub stars
Chrome extension that labels each X post with Substance, Humor, Chit-chat, Promo or Junk plus AI-written and off-topic flags, collapsing hidden posts to one line.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
bohutang/siftJavaScript
bohutang/siftJavaScript11GitHub stars
Chrome extension that labels each X post with intent plus rage-bait, synthetic, and undisclosed-ad signals from Jev, with threshold-only rendering and local caching.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
manifoldor/xtagsJavaScript
manifoldor/xtagsJavaScript8GitHub stars
Chrome extension that judges Taobao and JD listings against double-weekend-off clues and stamps a PASS mark over product images it guesses come from non-weekend-off shops.
Jev Demos & Experiments#community#awesomejev#catalog-import
7GitHub stars
Browser F1 game where Jev drives one car live from telemetry phrased as race-engineer words, choosing track aim, pedals, and a trouble probability while you can race it yourself.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
enoyola/jev-grand-prixJavaScript
enoyola/jev-grand-prixJavaScriptFrom the Jev guides
Original write-ups on what this entry is for.
A game tick is a state plus a legal action list. How Clash Royale, Minecraft, and the earlier Mario, Pokémon, StarCraft, and drone loops ask Jev one step at a time.
Jev Demos & Experiments#gaming#agents#control
Read article
From the Jev community
Posts from builders shipping with Jev right now.