Yokai Soba Shop
Free · play online in your browser, no download
A cozy seven-night sim: inherit your late grandmother's mountain soba shop and feed the yokai regulars she quietly served for decades.
Official site jeonghwankim.dev, verified Nov 3, 2026. On the developer's own domain; the developer's case study page links it (“Visit Website”), and it is the entry URL in the official Vibe Jam 2026 games data.
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 Yokai Soba Shop
A free, bilingual (Korean and English) cozy management sim for the browser, set in a 1960s Japanese mountain village. You inherit a small soba shop from your late grandmother, who quietly fed yokai for decades, and run it for seven nights. Each morning you wake in the daylit shop, find one glowing object (a handkerchief, an IOU note, a feather) and a memory of your grandmother tells you what that customer likes; each night you drag ingredients into a bowl and serve the yokai who come in, with a dashi-pouring timing mini-game graded perfect, good or off and no failure state. The ending changes with how close you grew to each regular. The developer, Jeonghwan Kim, built it solo in four days for the Cursor Vibe Jam 2026 and writes of having written zero code by hand: every line was generated through guided iteration with Claude, which wrote 95%+ of the code under direction, while the art, music and design decisions were the developer's own. The jam's rules required at least 90% of each game's code to be written by AI; the official submission lists Claude Code as the tool. It finished 762nd of 945 entries. Free on the developer's own site.
How it was built
Partially verifiedThe official Vibe Jam 2026 submission lists Claude Code as the tool. The developer's case study says zero code was written by hand: every line is AI-generated through guided iteration with Claude, which wrote 95%+ of the code under direction. It describes treating Claude “like a junior engineer who needs direction”, giving examples of tone and feel rather than implementation hints, writing design feedback in plain Korean, and stopping Claude twice when it over-engineered. Art, music and design decisions were the developer's, per the case study.
- DeveloperCase study: “Code written 95%+ by Claude under direction; art, music, and design decisions mine.” and “Wrote zero code by hand — every line is AI-generated through guided iteration with Claude.” — Jeonghwan Kim
- DeveloperOfficial jam submission: made with Claude Code. — Vibe Jam
- OfficialJam rule 3: at least 90% of the code has to be written by AI. — Vibe Jam (Pieter Levels)
Solo, in four days, per the developer's case study: the developer directed and Claude wrote the code. Vanilla JavaScript on a 640×360 Canvas 2D view with integer scaling, built with Vite; one game-state tree updated through reducer-style actions; Korean and English text switched live through a Proxy-based locale layer (200+ strings). One streamed background-music file; the four sound effects are synthesized in the Web Audio API. The whole runtime is one 55 kB JavaScript bundle.
- Engine / framework
- None (vanilla JavaScript, Canvas 2D, Vite)
- Languages
- JavaScript
- Team size
- 1 (solo)Developer ReportedJeonghwan Kim
- Initial build time
- 4 days (solo)Developer ReportedJeonghwan Kim
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- ~95% of shipped codeDeveloper ReportedJeonghwan Kim
“Wrote zero code by hand — every line is AI-generated through guided iteration with Claude.”Verification notes: AI use, team size, build time, stack and gameplay from the developer's case study on jeonghwankim.dev, re-read on 5 Nov 2026; tool (Claude Code), engine (“Vanilla HTML5 Canvas 2D (no engine)”), genre (Adventure, Simulation), pitch and the multiplayer (No), mobile (Yes) and portal (Yes) flags from the entrant's answers in the official Vibe Jam 2026 games data (submitted 30 Apr 2026, 20:44 UTC; final rank 762 of 945 entries, no award); rule 3 on the jam page requires at least 90% AI-written code. The case study says “Claude” and the jam entry “Claude Code”; Claude Code is recorded. The case study gives the AI share as “95%+”, recorded as 95. The GitHub repository linked from the case study could not be opened from our environment on 5 Nov 2026, so its contents and licence are not recorded and no GitHub listing is added. No location is recorded. The game page's language is Korean; the case study says it is playable in Korean and English. The developer names Mistia's Izakaya as an example of a cozy game that depends on atmosphere; no names or assets from it are used as far as the sources show. The game was not played. The game's code was checked for calls to AI services and none were found. The release date is not stated; the jam submission is dated 30 Apr 2026.
Development history
Entered in the Cursor Vibe Jam 2026 (submission date in the official games data, 20:44 UTC); the jam required at least 90% AI-written code. Final rank 762 of 945 entries, no award.
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)
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 |
|---|---|---|---|
| Cursor Vibe Jam 2026 — rules, prizes and game stats Vibe Jam (Pieter Levels) | Official site | Not confirmed | Nov 3, 2026 |
| Vibe Jam 2026 games data (entrant submissions, final rank, awards) Vibe Jam | Official site | Not confirmed | Nov 3, 2026 |
| 요괴 소바집 (Yokai Soba Shop) — game page Jeonghwan Kim · Korean | Official site | Not confirmed | Nov 3, 2026 |
| Case Study — Yokai Soba Shop (요괴 소바집): “Four days, one game.” Jeonghwan Kim | Devlog | Not confirmed | Nov 3, 2026 |
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