墨の山 ― 馬の旅人
Free · play online in your browser, no download
A horse traveller in a straw hat climbs an ink-wash mountain to the torii at the top, in one short 3D stage made in an evening with Claude.
Official site jeminisaga.github.io, verified Nov 3, 2026. Linked from the developer's own note article (7 Nov 2026) and hosted on the developer's GitHub Pages; the repository holds the game's source.
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 or mobile browser. No download.
Browser (no download) · Mobile · Official link verified Nov 3, 2026.
About 墨の山 ― 馬の旅人
墨の山 ― 馬の旅人 (“Ink Mountain: The Horse Traveller”) is a short, free 3D platformer for the browser drawn to look like sumi-e ink painting. You play a horse traveller in a straw hat and climb a single stage of cliff steps, stepping stones, a ladder, moving boards and a lift to reach the torii gate at the top of the mountain; if you fall, you restart from just before. A run takes a few minutes and a timer counts it. It plays with the arrow keys or WASD and Space on a computer, and with on-screen buttons on a phone (left side to walk, right button to jump). The developer, なかあき, says they did not do the hands-on work themselves, only said what they wanted and made decisions along the way: Claude wrote the code (the 3D world, controls, mechanisms and the recording of the play video), an image AI drew the hero and textures, Tripo turned the hero into a rigged, animated 3D model, and Blender, operated by Claude, made the data lighter. Made in about an hour and a half one evening, for about one dollar of Tripo credits. In Japanese.
How it was built
Partially verifiedIn a note article (7 Nov 2026) the developer writes: “自分は手を動かしていません。やったのは「こういうのを作りたい」と伝えて、途中で決めることだけです。” (I did not do the hands-on work. All I did was say what I wanted to make and decide things along the way), and splits the work as “コード（3Dの世界、操作、仕掛け、録画）：Claude” (code: the 3D world, controls, mechanisms and recording, by Claude), with Blender “Claudeが操作” (operated by Claude). The article quotes the first request to Claude: a browser 3D game with an ink-wash look and a straw-hatted horse traveller, one stage of steps, stepping stones, a ladder, moving boards and a lift up to a torii at the summit, keyboard controls on PC and on-screen buttons on phones, three to five minutes long, restarting just before a fall; details such as moving the camera closer or showing the mountains in the background were added while looking at the result. The article does not say which Claude app was used.
- ObservedRepository README: “コード（3D・操作・仕掛け）：Claude（Three.js）”. Its single commit (4 Nov 2026, 23:25 JST) carries a “Co-Authored-By: Claude Opus 5.5” trailer. — GitHub (jeminisaga)
Three.js 0.170 with its glTF loader, in plain JavaScript modules on GitHub Pages. An image AI (not named) drew a single front-facing picture of the hero, plus the background mountains, rock, stone paving and board textures; Tripo turned the picture into a 3D model in about a minute (30 credits) and added a skeleton and idle, walk, jump and climb animations (65 credits), about $0.95 in all, and Blender, operated by Claude, made the model lighter. The developer had to create a Tripo API key (mistaking an account ID for it at first) and buy $10 of API credits, because the free sign-up credits only work on Tripo's website. The video for the developer's post was recorded by having the game play itself, which kept falling off stepping stones and moving boards until the platform widths and timing were adjusted. The game makes no calls to AI services.
- Engine / framework
- Three.js
- Languages
- JavaScript
- Team size
- Not disclosed
- Initial build time
- About 1.5 hours (21:55 to 23:25)Developer Reportednote (なかあき)
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“自分は手を動かしていません。やったのは「こういうのを作りたい」と伝えて、途中で決めることだけです。”Verification notes: AI use, time and costs from the developer's note article (7 Nov 2026, 22:01 JST), read through note's public API on 8 Nov 2026; the article says it collects a post first published on X and links the game. Controls and title from the game page; README, assets and commit from the GitHub repository jeminisaga/sumi-uma, cloned on 8 Nov 2026 (one commit, 4 Nov 2026, 23:25 JST, matching the article's 21:55 to 23:25 build window, which we take as the evening of 4 Nov 2026). The code claim is the developer's split of the work (code by Claude, no hands-on work by the developer); no share is stated, so none is recorded. Claude is recorded rather than Claude Code because the article names only Claude; the commit trailer suggests an agent but is not a statement. The roughly one-dollar cost covers the Tripo credits only; the developer bought $10 of credits and does not mention other costs, so no development cost is recorded. The game's script imports only Three.js and contains no AI service addresses. Developer: なかあき on note (jeminisaga0413) and jeminisaga on GitHub, who says they work alone and build business systems with AI; no further details are given. The English title in the description is our translation; there is no official one. The game was not played.
Development history
Built in about an hour and a half in the evening and published on GitHub Pages (commit at 23:25 JST).
The developer's note article explains which AI made which part and the four problems along the way.
Developernote (なかあき)
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 desktop and phone browsers (GitHub Pages), with nothing to install. Keyboard on a computer, on-screen buttons on a phone.
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 |
|---|---|---|---|
| 【保存版】AIだけで、墨絵の3Dゲームを作った｜費用は約1ドル・1時間半。つまずいた4つのこと note (なかあき) · Japanese | Devlog | Nov 7, 2026 | Nov 3, 2026 |
| jeminisaga/sumi-uma GitHub (jeminisaga) · Japanese | Repository | Nov 4, 2026 | Nov 3, 2026 |
| Official game page (language check) なかあき | Official site | Not confirmed | Nov 3, 2026 |
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