オークションギャラリー
Free · play online in your browser, no download
An online fan version of the auction board game Modern Art: buy and sell paintings through five kinds of auction with 3 to 5 players.
Official site auctiongallery.anpanpass.com, verified Nov 3, 2026. Linked twice as the game from the developer's own Zenn article.
Rights holder / original work: Modern Art (board game by Reiner Knizia)
The developer's article calls the game a fan game with no connection to the official one and presents it as a place to play the board game ModernArt (モダンアート) online. The game uses its own title and its own names for the five painters (Chrome Set, Naoko, Patrina C., Gerlt Weiss and Vanksy) and implements the board game's auction rules. No source shows a licence or permission from the game's author or publishers. (Zenn (anpan))
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Where to play
Every platform this game is on. Links are checked against official sources; we never host or mirror games.
- Play free — official siteBrowserReleasedFree
Runs in a desktop browser. No download.
Browser (no download) · Official link verified Nov 3, 2026.
About オークションギャラリー
オークションギャラリー (Auction Gallery) is a free online fan implementation, in Japanese, of Modern Art, the auction board game. Three to five players meet in a room and take turns putting paintings up for auction from their hands; each card carries one of five auction types: open bidding until time runs out, once-around bidding starting from the auctioneer's left, sealed bids revealed together, a fixed price set by the auctioneer, and double auctions that add a second card by the same painter. The paintings belong to five fictional painters with the game's own names, a round ends when one painter's fifth card comes out, and the player with the most money at the end wins. The developer, anpan, says in a Zenn article that it is a fan game with no connection to the official game, made because there was nowhere to play Modern Art in a browser or on iOS. anpan chose the design and the technology and left the actual code writing to Claude Code and Codex, describing the result as a board game made almost entirely with them. The article states that only PC play is guaranteed for now.
How it was built
Partially verifiedIn the Zenn article the developer writes that the board game was made “ほぼClaudeCode・Codexだけで” (almost entirely with Claude Code and Codex): “設計や技術選定はこちらで決定するが、実際にコードを書いてもらうのはClaudeCode,Codexに任せました” (I decided the design and technology choices, but left the actual writing of the code to Claude Code and Codex). Both ran on plans of about 3,000 yen. The workflow: decisions logged in a memory.md the agents keep, many unit and end-to-end tests, README and spec documents, and screenshots and recordings made through the Chrome DevTools and Playwright MCP servers for review; the developer still skimmed the code and caught, for example, debug code reachable in production. The article says it was itself written without generative AI.
Named with Claude Code as the agent that wrote the code, used through a ChatGPT Plus plan (about 3,000 yen); the article mentions running it with --full-auto. Its share of the work is not stated.
The developer chose the stack without much input from the AI, sticking to familiar technology: a Remix SPA front end, an Express (Node.js) back end, socket.io for game sessions with Redis for sticky sessions, hosting on fly.io behind Cloudflare, and a Next.js landing page. Claude Code and Codex wrote the code against detailed specs, tests and documentation. The live game has a fallback environment for maintenance and links an X account for the game; bug reports go to a public issues repository on GitHub.
- Engine / framework
- None (Remix SPA front end; Express and socket.io back end)
- Languages
- Not disclosed
- Team size
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“実際にコードを書いてもらうのはClaudeCode,Codexに任せました”Verification notes: AI use, stack and workflow from the developer's Zenn article (6 Apr 2026, 07:59 UTC+9; updated 14 Apr 2026), re-read on 7 Nov 2026; it links the game twice and the public issues repository github.com/imamiya-masaki/modernart-public, which could not be opened from the research environment. “Almost entirely” is the developer's wording, so no AI code share is recorded. Player count (3 to 5), the five auction types, the painters' names and the round and scoring texts from the game's scripts, fetched on 7 Nov 2026; the scripts talk only to the game's own server (with a fallback host) and contain no calls to AI services. The game's title in the interface is オークションギャラリー; the English name follows the domain and the game's X account (auction_ga). Developer: the Zenn profile anpan links GitHub imamiya-masaki and X anpanpass; the article is tagged 個人開発 (personal project) and written in the first person; no team size is stated. No release date is given; the article is the earliest dated source. The game was not played.
Development history
The developer publishes a Zenn article on making the game with Claude Code and Codex and invites players and bug reports.
DeveloperZenn (anpan)
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; online rooms for 3 to 5 players. The developer guarantees PC play only for now.
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 |
|---|---|---|---|
| ClaudeCode・Codexでボードゲームのオンラインゲームを作成した Zenn (anpan) · Japanese | Devlog | Apr 6, 2026 | Nov 3, 2026 |
| オークションギャラリー (game page and scripts) anpan · Japanese | Official site | Not confirmed | Nov 3, 2026 |
| anpan (Zenn profile) Zenn · Japanese | Official site | Not confirmed | Nov 3, 2026 |
| Official game page (language check) anpan | Official site | Not confirmed | Nov 3, 2026 |
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