ドパパパ放置
Free · play online in your browser, no download
A small browser idle game: clear stages while you are away and summon equipment through a gacha built around its effects. The developer plans and playtests; Codex does the implementation.
Official site dopapapa-idle.pages.dev, verified Nov 3, 2026. Linked as the alpha's play address in the developer's own note announcement.
Built around a gacha that summons equipment, pulled as often as you like; the developer says the game has no payments and no ads. (note (銀河AI工房みつみつ / gingamitsumitsu))
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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 siteBrowserEarly access · Alpha (α版)Free
Runs in a desktop or mobile browser. No download.
Browser (no download) · Mobile · Official link verified Nov 3, 2026.
About ドパパパ放置
ドパパパ放置 (Dopapapa Idle) is a free idle game for the browser; its page sums it up as a small idle game in which you tap, collect and grow stronger with equipment summons. Stages advance while you leave it running, the goal is to get through all 100 stages, and the gacha can be pulled as often as you like with the summoning effects shown from start to finish. The developer says the focus is the summons themselves: the aim is a game where you want to see what the next summon looks like, not one where you just make numbers go up efficiently. The alpha (α版) has no payments and no ads; the developer has checked the basics on PC and Android but not yet on iPhone. The developer, writing on note as 銀河AI工房みつみつ, says the developer handles planning, spec decisions and playtesting while Codex does the implementation, with ChatGPT used to talk through specs and write the requests for Codex and Claude brought in to audit the project; an earlier devlog about the same, then unnamed, project says the developer basically does not write code and is the only human on it. The alpha was announced on note on 6 November 2026 (Japan time) and is hosted on Cloudflare Pages. In Japanese.
How it was built
Partially verifiedThe alpha announcement (6 Nov 2026) says: “今回のゲームは、私が企画や仕様の判断、試遊を担当し、Codexに実装を進めてもらう形で開発しています。” (I handle planning, spec decisions and playtesting, and Codex does the implementation.) It adds that the developer consulted ChatGPT and had another AI audit the work, and that the earlier Codex devlog series was about this game. That devlog (25 Oct 2026) describes the method: the developer talks through features with ChatGPT, ChatGPT writes a request for Codex, and Codex implements it; “私は基本的にコードを書かない。” (I basically do not write code.) The developer writes that the relay caused problems: ChatGPT's requests had become the de facto spec, and a rule not to touch approved parts led Codex to add parallel systems instead of reusing existing ones.
- DeveloperDevlog (25 Oct 2026): ChatGPT drafts requests, Codex implements, and the developer basically does not write code; “人間の開発メンバーは私しかいない” (the only human developer is me). — note (銀河AI工房みつみつ / gingamitsumitsu)
Used to work out features and specs and to write the request text handed to Codex, per the 25 Oct 2026 devlog; the alpha announcement mentions consulting ChatGPT.
Added later as an outside auditor of the project's direction; the 25 Oct 2026 devlog says a Claude audit surfaced that the developer and ChatGPT had never agreed on what “alpha version” meant. The product (app or Claude Code) is not named.
The developer plans, decides specs and playtests; ChatGPT turns the discussion into requests and Codex implements them, with Claude auditing the project. The live build is a React web app (observed in its scripts) hosted on Cloudflare Pages; one sound effect comes from Pixabay.
- Engine / framework
- Not disclosed (React web app, observed in the build)
- Languages
- Not disclosed
- Team size
- 1 (solo)Developer Reportednote (銀河AI工房みつみつ / gingamitsumitsu)
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“私は基本的にコードを書かない。何を作りたいか考え、実際に動かしてみて、思っていたものになっているか確認するのが自分の役割だ。”- Developer's note announcing the alpha (Japanese)
- Developer's Codex devlog: solo development that turned into team development (Japanese)
Verification notes: AI use, the method and the alpha's contents come from the developer's note articles of 25 Oct 2026 (13:58 JST) and 6 Nov 2026 (00:46 JST, i.e. 5 Nov 15:46 UTC), re-read on 6 Nov 2026. The alpha announcement's headline says the game was made together with AI (AIと一緒に); its body says Codex does the implementation, and the earlier devlog says the developer basically writes no code. The developer says the game was online before the announcement, without saying since when, so no release date is recorded. The page's description and English name (Dopapapa Idle) come from its HTML on 6 Nov 2026; its scripts are a React build whose only network requests load its own sound files, and no AI services are called. The game was not played. No name or location is given.
Development history
Codex devlog on the then unnamed project: ChatGPT writes the requests, Codex implements, and the developer basically writes no code.
Developernote (銀河AI工房みつみつ / gingamitsumitsu)Alpha announced on note (00:46 Japan time); the build was already online on Cloudflare Pages.
Developernote (銀河AI工房みつみつ / gingamitsumitsu)
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 install; the developer says there are no payments or ads. Checked on PC and Android; iPhone not yet confirmed.
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 |
|---|---|---|---|
| AIと一緒に作っていた放置ゲーム「ドパパパ放置」のα版を公開しました note (銀河AI工房みつみつ / gingamitsumitsu) · Japanese | Devlog | Nov 6, 2026 | Nov 3, 2026 |
| 【Codex開発雑記】一人で開発していたつもりが、AIに任せたらもうチーム開発だった note (銀河AI工房みつみつ / gingamitsumitsu) · Japanese | Devlog | Oct 25, 2026 | Nov 3, 2026 |
| ドパパパ放置 — Dopapapa Idle (game page and scripts) 銀河AI工房みつみつ (Cloudflare Pages) · Japanese | Official site | Not confirmed | Nov 3, 2026 |
| Official game page (language check) 銀河AI工房みつみつ | Official site | Not confirmed | Nov 3, 2026 |
