あなたは死んだ。あの世の門の前で、審判はHwatu（韓国の花札）の一局で下される。本物のHwatuと本格的なゴーストップ（Go-Stop）のルールに、得点と倍率が暴走するデッキ構築を重ねた。手に入る札は、あなたが生きた前世そのものだ。死神を出し抜いて門を越えるか、地獄に落ちて再び門の前に立つか。

You are dead. At the gates of the afterlife, judgment is settled over a game of Hwatu. Real Korean flower cards and authentic Go-Stop rules meet runaway score-multiplier deckbuilding. The hand you draw is the life you lived. Outplay the Reaper to pass, or fall to hell and face the gate again.

YouTube video by BenW0lf

GO, STOP Demo - a hwatu Deckbuilder, i know nothing about | Streaming just chatting.

ALT: 윤픽 Playing Korean Flower Cards (Hwatu)

あなたは死んだ。あの世の門の前で、審判はHwatu（韓国の花札）の一局で下される。本物のHwatuと本格的なゴーストップ（Go-Stop）のルールに、得点と倍率が暴走するデッキ構築を重ねた。手に入る札は、あなたが生きた前世そのものだ。死神を出し抜いて門を越えるか、地獄に落ちて再び門の前に立つか。

Your coding agent edits a component, runs the build, and reports the UI is now "pixel-perfect." It never opened a browser. It's guessing. I got tired of that, so I built hwatu, a browser designed specifically for the agent verification loop. ## The loop hwatu --headless http://localhost:3000 # open, no focus steal hwatu wait-load # block until loaded hwatu eval 'document.title' # DOM-level checks hwatu shot /tmp/check.png # screenshot hwatu diff --id 1 --baseline before.png # pixel diff: 97.49% match + heatmap hwatu close 1 The whole loop, screenshot included, runs in about 87 ms on my laptop. Cheap enough that the agent can verify after every edit instead of claiming success blind. ## Design choices * **Headless by default in agent environments.** Windows never steal focus while you keep typing. When you want to look, the agent hands you the same live window as a normal browser. * **No Chromium.** One static Rust binary plus your distro's `webkitgtk-6.0`. No 170 MB download per project. * **Three protocols.** MCP (`hwatu mcp`), plain CLI, and a 1-line JSON socket. Works with Claude Code, Cursor, Jcode, or any harness. * **Real numbers.** The diff command reports an actual match percentage with a heatmap, so "pixel-perfect" becomes a measurable claim. ## Measured, not estimated Every benchmark in the repo was measured on real runs with scripts you can rerun: window spawn medians of 13-16 ms, ~87 ms full verification loop, memory measured via PSS across all WebKit child processes. Methodology in docs/benchmarks.md. ## Try it curl -fsSL https://raw.githubusercontent.com/hongnoul/hwatu/main/scripts/install.sh | bash hwatu setup # detects Claude Code, Cursor, Jcode, or generic MCP MIT licensed. Linux (WebKitGTK). Feedback and issues welcome: https://github.com/hongnoul/hwatu

Daemon-based WebKitGTK browser for tiling WMs: real rendering, ~13ms window spawn

Characters and creatures from the anime masterpiece step into the world of Japan’s traditional card game.

A roguelike deckbuilding game meets Hwatu cards. Never played Hwatu before? No problem. Jump right in and discover an addictive roguelike card game that

A roguelike deckbuilding game meets Hwatu cards. Never played Hwatu before? No problem. Jump right in and discover an addictive roguelike card game that