ふんばり柴さんぽ
Free · play online in your browser, no download
Get a stubborn shiba home before sunset by pulling and slackening the lead. A non-engineer made it in two days by talking to Claude Opus 5.5 in Cowork; everything is drawn in code.
Official site momoyuzu.itch.io, verified Nov 3, 2026. Linked as the game's address in the developer's own note article; itch.io author MOMOYUZU.
Where to play
Every platform this game is on. Links are checked against official sources; we never host or mirror games.
- Play free — itch.ioitch.ioReleasedFree
Plays in the browser on itch.io. No download.
Browser (no download) · Mobile · Official link verified Nov 3, 2026.
About ふんばり柴さんぽ
ふんばり柴さんぽ (Stubborn Shiba Walk) is a free browser game about walking a shiba inu that would rather not. Hold the Space key, or hold the screen on a phone, to pull the lead; you only move while pulling. When the shiba digs in its front paws, let go and wait it out, because pulling too long slips the collar off and sends you three metres back; when it flops down and will not move, one of a limited number of treats (X key) puts it back in a good mood. The goal is to get home before the sun goes down. There are four shibas: こむぎ (Komugi, the first-timer), あずき (Azuki, the one who flops), ごんた (Gonta, the one who digs in) and とのさま (Lord Tono, the final boss), with star ratings and best times. The game uses no image files: the characters and backgrounds are drawn in code. The developer, mona (MOMOYUZU on itch.io), writes on note as a one-person marketer and non-engineer and says it took two days, made by talking to Claude Opus 5.5 in Cowork in the Claude desktop app, starting from one line with a typo (“拒否芝や頑固芝を手なづけるっていうゲーム作りたい”, I want to make a game about taming refusing and stubborn shibas). Claude asked questions and settled the theme, controls and format, and every later change, from the shibas' look (redesigned three times) to moving only while pulling, was asked for in plain words. It was first published as a Claude page, then packaged by Claude as a zip for itch.io. There is no sound or music yet. It plays on phones and computers, in Japanese and English.
How it was built
Partially verifiedThe developer's note article (1 Oct 2026) says: “使ったのは、Claudeのデスクトップアプリにある「Cowork」のOpus 5.5です。” (I used Opus 5.5 in Cowork in the Claude desktop app.) There was no plan or design document: after the first one-line message, Claude asked questions and the theme (shibas), the play (a tug-of-war on the lead) and the format (a browser page) followed from the answers. The first version was published as a Claude page; “キャラクターも背景も、画像は1枚も使っていません。全部コードで描かれていて、コードといっても基本はHTMLです。” (Not a single image is used for the characters or backgrounds; everything is drawn in code, basically HTML.) Changes were requested in plain words, such as “a bit cuter” with reference pictures, “the eyes a bit smaller”, “the person splits in two” and “walking by itself is too easy”; the shibas were redesigned three times and the Claude page updated ten times. Claude also built the itch.io zip (five versions) and helped fill in the itch.io form. The developer says it was never actually hard.
- Developeritch.io AI disclosure: AI Assisted, Code, Graphics, Text. — itch.io
Made through conversation with Claude (Opus 5.5 in Cowork, Claude desktop app), first published as a Claude page, then exported as a single HTML file in a zip for itch.io. Characters and backgrounds are drawn in code with no image files; the shibas were redrawn as one outline for a rounder, mascot-like shape. A leaderboard from the Claude page version uses the Claude page's own storage and is hidden outside it.
- Engine / framework
- None (single HTML file)
- Languages
- JavaScript
- Team size
- Not disclosed
- Initial build time
- Two days from the first message to the itch.io releaseDeveloper Reportednote (mona / honest_toad1815)
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“キャラクターも背景も、画像は1枚も使っていません。全部コードで描かれていて、コードといっても基本はHTMLです。”Verification notes: AI use, the process and the time taken come from the developer's note article of 1 Oct 2026 (22:44 JST), re-read on 6 Nov 2026; the headline says one day, the text says two days to make and publish. Rules, shibas, controls, languages and the AI disclosure come from the itch.io page (status Released, HTML5, author MOMOYUZU), re-read the same day; it shows no publication date, rating or download count, so no release date is recorded. The tool is Claude in the desktop app's Cowork mode, not Claude Code, as the developer says. The itch.io build (fetched 6 Nov 2026) loads only Google Fonts and itch.io's own script; it checks for window.claude and, only when it exists (inside a Claude page), uses its db and user storage for the leaderboard, otherwise hiding the leaderboard. No AI model is called during play. The developer says some reference pictures shown to Claude were of existing characters and that Claude took only the round, soft feel and made original shibas; we found no third-party names on the page. The game was not played. No full name or location is given.
Development history
The developer's note article on making the game with Claude in two days and publishing it on itch.io.
Developernote (mona / honest_toad1815)
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.
itch.io
Free in the browser (HTML5) on phones and computers; $0 or donate, with donations from $1 per the developer.
Not publicly available: itch.io rating, Gross revenue.
Reviews & rankings
Not yet reviewed by our editors.
Not currently ranked.
Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| Opus 5.5に話しかけるだけで、1日でゲームを公開できた。非エンジニアの私が作った「ふんばり柴さんぽ」 note (mona / honest_toad1815) · Japanese | Devlog | Oct 1, 2026 | Nov 3, 2026 |
| ふんばり柴さんぽ / Stubborn Shiba Walk by MOMOYUZU itch.io | Store page | Not confirmed | Nov 3, 2026 |
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