CONTACT: Carrier Warfare in the Pacific
Free · play online in your browser, no download
Command a carrier task force in the Coral Sea, 7–8 May 1942, in pausable real time: you command what you know, not what actually exists.
Official site flanker.github.io, verified Nov 3, 2026. Linked as the online game from the repository README, on the GitHub Pages site of the flanker account that owns the repository.
Where to play
Every platform this game is on. Links are checked against official sources; we never host or mirror games.
- Play free — official siteBrowserReleased · The README calls it the Coral Sea First PlayableFree
Runs in a desktop browser. No download.
Browser (no download) · Official link verified Nov 3, 2026.
About CONTACT: Carrier Warfare in the Pacific
A free, single-player carrier-command game in the browser, set in the Coral Sea on 7 and 8 May 1942, that runs in real time and can be paused. Its motto is “You command what you know, not what actually exists”: you assign fighters to combat air patrol, plan search sectors (aircraft, bearing and range), and read each contact report for its age, confidence, possible ship types and growing position error before planning a strike. Strikes are aimed at an estimated area and must find the ships again on arrival, deck time limits launches, fighters on patrol cannot escort, and results arrive as delayed aircrew reports that may be wrong. Raid warnings pause the game, time runs at 1× to 60×, and the battle is assessed at 18:00 on 8 May, when every American flight deck is lost, or when you withdraw, with stopping Operation MO and ships sunk scored separately. The Japanese side is a game AI that sees only its own intelligence picture. One save slot is kept in the browser. The developer, flanker (写代码的flanker on Bilibili), says two web wargames about the battle were produced overnight by letting AI agents loop on their own, one with Codex (GPT-6 Astra) and one with Claude Code; this is the Codex version, and the Claude one is 珊瑚海海战 · Coral Sea. The repository holds the long “Codex Loop Engineering Master Prompt” the game was built from. In English; the source is public on GitHub.
How it was built
Partially verifiedIn the description of a Bilibili video (7 Sep 2026) the developer writes that, with Codex GPT-6 Astra and Claude Code Fable 5.1 in the news, they let an agent “loop” on its own overnight and it produced two web wargames (“晚上让 Agent 自己 loop 出来了两个网页版的战棋游戏”), and that the generated source code and both games are public. This repository is the Codex version: its docs/MASTER_PROMPT.md is titled “Codex Loop Engineering Master Prompt” and tells the agent (in Chinese) to keep developing the game from scratch until each milestone reaches a verifiable Done state, rather than produce a one-off demo or suggestions; LOOP.md sets out the loop (read state, pick the smallest valuable task, define acceptance criteria, implement, verify, reassess, record, validate by play) and AGENTS.md holds the project's invariants.
- ObservedThe repository's docs/MASTER_PROMPT.md (3,405 lines) is headed “Codex Loop Engineering Master Prompt” and calls itself Codex's persistent state (“这是 Codex 的持久状态”); the history has two commits on 6 Sep 2026, the first adding 68 files (full clone on 8 Nov 2026). — GitHub (flanker)
A browser game with no account or back end, built with Vite, React and TypeScript. The simulation in src/sim is independent of React and the DOM; a controller is the only state boundary, so the interface and the Japanese AI each see only their own side's intelligence picture. The war room is drawn in SVG (the README says the scenario's number of task groups did not need PixiJS), and all assets are generated locally, with no external images, fonts or services at run time. Saves record the version, seed and player commands and rebuild the battle deterministically. A GitHub Actions workflow runs formatting, type, lint, simulation and Chromium browser tests before publishing to GitHub Pages, and a stress script runs up to 10,000 full scenarios to check aircraft conservation and that hidden intelligence never leaks. The README says escort numbers, start positions, air operations, weather, combat and the invasion's progress are abstracted for play, the chart is schematic, and there are no scripted sinkings. No AI service is called by the game.
- Engine / framework
- React + SVG (TypeScript, Vite)
- Languages
- TypeScript
- Team size
- Not disclosed
- Initial build time
- Overnight (agent loop)Developer ReportedBilibili (写代码的flanker)
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“趁着 Codex GPT-6 Astra 和 Claude Code Fable 5.1 的火热，就晚上让 Agent 自己 loop 出来了两个网页版的战棋游戏。”- Source code (GitHub)
- Codex Loop Engineering Master Prompt (GitHub, Chinese)
- Developer video: two web wargames made with GPT-6 and Fable 5.1 (Bilibili, Chinese)
Verification notes: AI use from the description of the developer's Bilibili video (BV1Ljbw63EQ4, uploaded 7 Sep 2026, 11:15 UTC, by 写代码的flanker); Bilibili could not be reached from the research environment on 8 Nov 2026, so the description was read from the researcher's saved copy of the video data made the same day. The researcher's notes also quote a comment under the video giving the Codex version's source and play links; that comment could not be re-opened, but the repository README links the same play address. The repository was cloned on 8 Nov 2026: two commits on 6 Sep 2026 (11:01 and 11:08 Beijing time), under an author name that is not the account name, so only the handle is used; neither carries an AI co-author trailer, and the Codex attribution rests on the video and on MASTER_PROMPT.md. The video names the model as GPT-6 Astra. No share of AI-written code is stated. Gameplay is from the README; the live page was opened on 8 Nov 2026 (title “CONTACT — Carrier Warfare in the Pacific”, English interface, e.g. “Start Coral Sea”, “Plan strike”, “Field guide”) but the game was not played. The README says the debug truth view exists only on the development server. The repository shows no licence file. The video does not say whether the developer worked alone. The sister game 珊瑚海海战 · Coral Sea (Claude Code version) is a separate record. The video says the agent built the games “晚上” (at night); the two commits are time-stamped 11:01 and 11:08 UTC+8 on 6 Sep 2026, so the overnight build time is the developer's description and is not confirmed by the commit times.
Development history
The game is committed to GitHub in two commits (Beijing time) and published through GitHub Pages.
The developer publishes a Bilibili video presenting this game and its Claude Code-made sister game 珊瑚海海战 · Coral Sea.
DeveloperBilibili (写代码的flanker)
Game performance
Each figure measures something different — concurrent players, owners, downloads and sales are never interchangeable and are never added together. Labels show where each number comes from.
Browser (official site)
Free in the browser with no account or back end; one save slot in browser storage.
No public metrics recorded for this listing.
Not publicly available: Concurrent players (site), Monthly revenue, Gross revenue.
Sales & revenue (all platforms)
Browser game — there are no downloads to count.
Reviews & rankings
Not yet reviewed by our editors.
Not currently ranked.
Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| 珊瑚海海战！我用 GPT-6 和 Fable 5.1 做了两款网页战棋游戏 Bilibili (写代码的flanker) · Chinese (Simplified) | Social post | Sep 7, 2026 | Nov 3, 2026 |
| flanker/contact (README) GitHub (flanker) · Chinese (Simplified) | Repository | Not confirmed | Nov 3, 2026 |
| flanker/contact — MASTER_PROMPT.md, LOOP.md and commit history GitHub (flanker) · Chinese (Simplified) | Repository | Not confirmed | Nov 3, 2026 |
| Official game page (language check) flanker | Official site | Not confirmed | Nov 3, 2026 |
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