AQUA BLUE 〜失われた海の記憶〜
Dive into a blue cove, photograph sea life for your field guide and gather the memory fragments of an island lost to the sea, in a calm 3D browser game.
Official site tanuu5.github.io, verified Nov 3, 2026. Linked as “▶ ブラウザで今すぐ遊ぶ” (play now in the browser) in the README of the developer's repository tanuu5/aqua-blue; hosted on the developer's GitHub Pages.
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 browser. No download.
Browser (no download) · Official link verified Nov 3, 2026.
- View on GitHubGitHubReleased · Source code (Vite, three.js; MIT licence)Free
Source code repository, not a place to play.
Official link verified Nov 3, 2026.
About AQUA BLUE 〜失われた海の記憶〜
AQUA BLUE 〜失われた海の記憶〜 (subtitle: memories of a lost sea) is a free 3D underwater exploration game in the browser. In the story, an old sea chart found among your late grandmother's belongings, together with the lullaby she used to sing, sends you by boat to a cove of a southern island. You dive from the boat and swim through a coral garden, a rock tower circled by manta rays, a sunken temple, a blue cave and the cliffs of the open sea, photographing creatures to fill a field guide of 20 species, rated one to three stars by how well each shot is framed, and searching for eight glowing memory fragments that carry the voices of the people who once lived on the drowned island. There is no combat and no game over: air runs down faster the deeper and faster you swim, but when it runs out the captain simply pulls you back onto the boat and you keep everything you collected. It is made for PC, played with keyboard and mouse or a gamepad, and saves progress and settings in the browser and photos in IndexedDB. The README says the island, seabed, temple, boat, creatures, water surface, sky, music and sound effects are all generated in code, with no image, 3D model or audio files in the game. The README credits planning and direction to the developer, たぬ (tanuu5), and development to Claude Code with Claude Opus 5.5 at the MAX reasoning level. The game is in Japanese, and the code and text are MIT-licensed.
How it was built
Partially verifiedThe README credits “企画・ディレクション：たぬ ／ 開発：Claude Code（Claude Opus 5.5・推論レベル MAX）” (planning and direction: たぬ; development: Claude Code with Claude Opus 5.5 at the MAX reasoning level) and says the game was made with Claude Code and Claude Opus 5.5 (MAX). Per the README, たぬ supplied four AI-generated images of a game that does not exist (a title screen, mantas over a reef, a sunken ruin and a blue cave) as a starting point, and these were turned into a playable game; the images themselves are not used in it. Which tool made those images is not stated.
- DeveloperThe developer's note says six browser works, AQUA BLUE among them, were made with Claude Code (Claude Opus 5.5) between 3 and 7 Oct 2026 and published on GitHub. — note (たぬ / tank_ai)
Directed by たぬ, with Claude Code doing the development from four AI-generated mock-up images. Per the README, the seabed is built from a height function and the island, caves, arch, rock towers and statue head from signed distance functions; underwater light uses per-colour absorption, god rays, caustics computed from the refracting surface and bloom, with light and shadow baked once into a depth map at start-up. Fish school with a boids simulation, and mantas, turtles, morays, jellyfish, dolphins and a whale shark have their own movements. Music and sound effects are synthesised live with Web Audio, and the lullaby's melody and lyrics and the story text were written for the game. The project builds with Vite and deploys to GitHub Pages through GitHub Actions. The developer's note says that partway through, they built development assets as Claude Code skills (for checking 3D models and sharing UI/UX rules) to use fewer tokens.
- Engine / framework
- Three.js (Vite)
- Languages
- JavaScript
- Team size
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“企画・ディレクション：たぬ ／ 開発：Claude Code（Claude Opus 5.5・推論レベル MAX）”- Source on GitHub (tanuu5/aqua-blue, MIT)
- Developer's note on six browser works made in five days (Japanese)
Verification notes: Gameplay, credits, techniques and the release date (2026-10-04, from the README's update history) come from the README, read through raw.githubusercontent.com on 4 Nov 2026; the MIT licence is from the LICENSE file (© 2026 たぬ). The README also says the MIT licence does not grant use of the Claude name or trademark. github.com and the GitHub API did not answer our checks, so commit dates and stars are unchecked. The developer's note of 8 Oct 2026 groups the game with five other works made with Claude Code between 3 and 7 Oct 2026 and says AQUA BLUE is for PC with keyboard and mouse (or gamepad). The hosted game loaded on 4 Nov 2026 (page language ja); its script contains no calls to AI services. The README says creature names are those of real species, with shapes and movement stylised for the game. Team size is not stated; the README names たぬ for planning and direction and no other person. The game was not played.
Development history
- 3–7 October 2026
Made with Claude Code (Claude Opus 5.5) as one of six browser works the developer built and published on GitHub in five days, per the developer's note.
Developernote (たぬ / tank_ai) Public release in the browser, per the README's update history.
DeveloperGitHub
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 the browser with no install; made for PC (keyboard and mouse, or a gamepad).
No public metrics recorded for this listing.
Not publicly available: Concurrent players (site), Monthly revenue, Gross revenue.
GitHub
No public metrics recorded for this listing.
Not publicly available: GitHub stars.
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 |
|---|---|---|---|
| tanuu5/aqua-blue (README) GitHub · Japanese | Repository | Not confirmed | Nov 3, 2026 |
| Claude Opus 5.5 が5日間で作った6つのブラウザ作品：ゲーム（PVつき） note (たぬ / tank_ai) · Japanese | Devlog | Oct 8, 2026 | Nov 3, 2026 |
| Official game page (language check) たぬ (tanuu5) | Official site | Not confirmed | Nov 3, 2026 |
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