四倉の海
A tiny 3D walk along Yotsukura beach in Fukushima to its lighthouse, which you can find by sound. The developer says Claude Code made all of it, operating Blender, Godot and a music app itself.
Official site matsumatsu0506.itch.io, verified Nov 3, 2026. The developer's own itch.io page (matsumatsu0506), listed on the developer's itch.io profile.
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- Play free — itch.ioitch.ioReleasedFree
Plays in the browser on itch.io. No download.
Browser (no download) · Official link verified Nov 3, 2026.
About 四倉の海
四倉の海 (Yotsukura no Umi, “the sea at Yotsukura”) is a very short 3D walk along the beach at Yotsukura in Iwaki, Fukushima, Japan, to the lighthouse. Press Enter to start, walk with the arrow keys and jump with Space; reaching the lighthouse clears the game, and R starts again. The lighthouse gives off a sound that grows louder as you approach, so that, as the developer puts it, you can tell its direction by ear without looking at the screen. The developer, matsumatsu0506, says the 3D beach was made in Blender, the game in Godot and the song 「四倉の海」 in Cakewalk Sonar, all of it by the AI Claude Code operating those programs while watching the screen, and shows the process in a YouTube series, 「AIはゲームエンジンを使いこなせるか？｜Godot編」 (Can AI master a game engine? Godot edition). The singing voice is VOICEVOX:波音リツ and the font Noto Sans JP; the page credits the game to Care Wave Software. Free in the browser on itch.io.
How it was built
Partially verifiedThe itch.io page says, in Japanese and English, that the game was made entirely by the AI Claude Code operating Blender (the 3D beach), Godot (the game) and Cakewalk Sonar (the song), looking at the screen as it worked. The page does not say how Claude Code was connected to those programs. Its itch.io AI disclosure ticks AI Assisted, Code, Graphics, Sounds and Text.
- DeveloperEpisode 1 of the developer's YouTube series, linked from the itch.io page and titled 「AIはゲームエンジンを使いこなせるか？【Godot編 第1話 四倉の海辺を歩けるように】」 (Godot edition, episode 1: making the Yotsukura beach walkable), on the channel Care Wave Software. Only the title and channel were checked; the video was not watched. — YouTube (Care Wave Software)
Per the itch.io page, Claude Code built the 3D beach in Blender, assembled the game in Godot and made the song in Cakewalk Sonar by operating each program while watching the screen, and the making-of is published as a YouTube series. The singing voice comes from the voice synthesiser VOICEVOX (voice: 波音リツ). The lighthouse's sound gets louder as you approach, so the goal can be found by ear.
- Engine / framework
- Godot
- Languages
- Not disclosed
- Team size
- Not disclosed
- Initial build time
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“3Dの海辺はBlender、ゲームはGodot、曲「四倉の海」はCakewalk Sonarで、すべてAIのClaude Codeが画面を見ながら操作して作りました。”Verification notes: AI use, controls and credits come from the itch.io page, which was published on 20 Oct 2026 (07:44 UTC) and updated on 23 Oct 2026 (06:38 UTC). The YouTube episode linked from the page was checked only by its title and channel name, not watched. The page also promotes another game by the same creator, a crowdfunded title for players aged 18 and over; it is not part of this record. Team size and location are not stated (the game is set in Iwaki, but no source says where the developer lives). The game was not played, so the in-game text and length were not checked; nothing on the page describes AI-generated content during play.
Development history
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Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| 四倉の海 Yotsukura no Umi by matsumatsu0506 itch.io · Japanese | Store page | Oct 20, 2026 | Nov 3, 2026 |
| AIはゲームエンジンを使いこなせるか？【Godot編 第1話 四倉の海辺を歩けるように】 YouTube (Care Wave Software) · Japanese | Devlog | Not confirmed | Nov 3, 2026 |
| matsumatsu0506 — itch.io profile itch.io · Japanese | Official site | Not confirmed | Nov 3, 2026 |
| Official game page (language check) matsumatsu0506 | Official site | Not confirmed | Nov 3, 2026 |
