よぞらのかけら
Free · play online in your browser, no download
Drop shards of the night sky, merge them up to the dawn and stretch a three-minute night. A quiet merge puzzle for the browser, its code written almost entirely by Claude Code.
Official site vannangames.com, verified Nov 3, 2026. Play address linked from the game's page on VANNAN GAMES (vannangames.com), the developer's own site, which the developer's Zenn article links.
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 よぞらのかけら
よぞらのかけら is a free merge puzzle for the browser, in Japanese, and a spin-off set in the world of the developer's novel 四十秒の交差点, told from the night side by the girl who kept refusing the morning in that story. You move a falling light sideways and let go; when two of the same kind touch they become the next tier, through eight tiers: star shard, star, star cluster, shooting star, crescent moon, half moon, full moon and “暁” (dawn). Only the first four fall from the sky, so every moon has to be built by merging, and bigger pieces take more room as the board fills. Leaving a piece above the top line ends the game. A play is one three-minute night: the sky behind the board moves from midnight towards morning and the game ends with “朝が、来た。” (morning has come). Making a dawn clears it from the board with a sunrise effect and adds 25 seconds to the night. Each tier you make for the first time that night gives one “wish”, which you can spend to send any piece back to the sky, and plays a line of the girl's monologue, which you can reread later; the developer says it works as a quiet puzzle without knowing the novel and means a little more if you do. The best score and the collected lines are saved in the browser. The developer rebuilt it after an early version, in which the first five tiers fell almost evenly, made reaching the dawn too easy. Per the developer, kawaiy, the code is almost all written by Claude Code; the illustrations were generated with ChatGPT and the music with Suno. Plain HTML, CSS and JavaScript with no framework. Free in desktop and phone browsers.
How it was built
VerifiedIn a Zenn article (23 Aug 2026) about building the eight-game VANNAN GAMES site in 34 days, the developer lists the division of work as “Claude : コード、ドキュメント、シナリオの下書き、レビュー” (Claude: code, documents, scenario drafts, reviews) and writes “コードはほぼClaude Codeに書かせています。” (I have Claude Code write almost all of the code.) Check and generator scripts run from a Claude Code Stop hook after every agent reply and again on GitHub Actions.
- DeveloperA production note on the site (17 Sep 2026) opens: “このサイトは、コードを書く作業の大半をAIに頼んで作っています。” (This site is built by leaving most of the code writing to AI.) — VANNAN GAMES
Generated the illustrations; the game's page credits “イラスト：ChatGPTで生成” (illustrations generated with ChatGPT). The four skies behind the board were newly drawn for the 12 Aug 2026 update, per the updates log.
Plain HTML, CSS and JavaScript with no framework, served as static files from Tencent Cloud EdgeOne Pages; the tier list is a separate script and records are saved in the browser's localStorage. Claude Code writes almost all of the code under checks run by a Stop hook; ChatGPT generates the illustrations and Suno the music.
- Engine / framework
- None (vanilla JavaScript)
- Languages
- JavaScript
- Team size
- 1 (solo)Developer ReportedVANNAN GAMES
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“コードはほぼClaude Codeに書かせています。”- Eight browser games in 34 days: Claude, ChatGPT and Suno, and what could not be handed off (Zenn, Japanese)
- Game page on VANNAN GAMES (Japanese)
Verification notes: AI use and the workflow come from the developer's Zenn article (23 Aug 2026, 02:03 JST), re-read through Zenn's API on 8 Nov 2026; it links vannangames.com. The article covers the whole site (eight games on 23 Aug 2026) and does not name this game, so the Claude Code statement is applied to each of its games. A production note on the site (17 Sep 2026) also says most of the code writing is left to AI. Rules, tiers, design notes and credits (企画・開発：kawaiy; illustrations generated with ChatGPT, BGM with Suno) come from the game's page, read on 8 Nov 2026. Release date: the site's updates log dates the release 20 Jul 2026 (the site's third game, the day the site opened); the game's page shows 公開日 30 Jul 2026, when the log says its introduction page was added, and last updated 21 Aug 2026. The three-minute night, the 25-second extension and usable wishes came in the 12 Aug 2026 update. The site's operator page names kawaiy (個人) as the operator. The English title is our translation; there is no official English title. The game's scripts contain no AI service addresses; the site loads Google Analytics. The Japanese interface was observed (lang="ja"); no other language option was found. The game was not played.
Development history
Released on VANNAN GAMES as the site's third game.
DeveloperVANNAN GAMESUpdate adds the three-minute night with a changing sky, the 25-second extension for each dawn and usable wishes.
DeveloperVANNAN GAMESThe developer's Zenn article describes building the eight-game site with Claude Code writing almost all of the code.
DeveloperZenn (kawaiy)
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 modern desktop and phone browsers, with no install or account; the best score and collected wishes are saved in the browser and not sent anywhere, per the game's page. The site accepts optional support through OFUSE.
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 |
|---|---|---|---|
| 34日でブラウザゲーム8本のサイトを立てた。Claude・ChatGPT・Sunoの分担と、丸投げできなかったもの Zenn (kawaiy) · Japanese | Devlog | Aug 23, 2026 | Nov 3, 2026 |
| よぞらのかけら｜夜空を集めるマージパズル｜VANNAN GAMES VANNAN GAMES · Japanese | Official site | Jul 30, 2026 | Nov 3, 2026 |
| 更新情報｜VANNAN GAMES VANNAN GAMES · Japanese | Official site | Not confirmed | Nov 3, 2026 |
| ルールを決めた8日後に、自分でそれを破った——AIへの指示を4つのレイヤーに分けた｜VANNAN GAMES 制作ノート VANNAN GAMES · Japanese | Devlog | Sep 17, 2026 | Nov 3, 2026 |
| VANNAN GAMESについて｜運営者情報 VANNAN GAMES · Japanese | Official site | Not confirmed | Nov 3, 2026 |
| Official game page (language check) VANNAN GAMES | Official site | Not confirmed | Nov 3, 2026 |
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