テイエス洞窟 3D ― 戦士ビルと紋様の呪い
Free · play online in your browser, no download
A short first-person dungeon RPG: the kingdom's strongest warrior is marked by a curse that changes him the deeper he goes.
Official site giii3-game.itch.io, verified Nov 3, 2026. The developer's own itch.io page (Giii3 game); both editions are listed on the developer's itch.io profile.
The developer's content notes: gender transformation and body transformation (TF/TG) themes and mild blood; no sexual content. The developer's profile says their stories deal with TS and corruption themes. (itch.io)
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Where to play
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- Play free — itch.ioitch.ioReleasedFree
Plays in the browser on itch.io. No download.
Browser (no download) · Mobile · Official link verified Nov 3, 2026.
- Play free — itch.ioitch.ioReleasedFree
Plays in the browser on itch.io. No download.
Browser (no download) · Mobile · Official link verified Nov 3, 2026.
About テイエス洞窟 3D ― 戦士ビルと紋様の呪い
A short 3D first-person dungeon RPG in the browser, adapted from the developer's own novel on Pixiv. Monsters are pouring out of the Teies Cavern, once a peaceful tourist spot, and Bill, the kingdom's strongest warrior, goes in to stop them, until a mysterious girl carves a red crest into his chest; the deeper he goes, the less his body, voice and heart feel like his own. You move on a grid (forward, back and turn), switch between first- and third-person views and can look down at yourself; there are enemies, but the developer says you rarely need to fight them. The ending depends only on the final battle: how many times you use “Call Out” on Bibi decides which of three endings you see. The Japanese page calls it a gamebook-like piece that takes 5 to 10 minutes, and it autosaves at the start of each chapter. The developer, Giii3, writes that it was made as a test of “Claude 5.5”, asking it to turn the novel into an RPG Maker-style game as-is: the code, 3D models, music and sound effects were made by Claude and the illustrations with image-generation AI, while the original story is the author's. The content notes mention gender and body transformation themes and mild blood, with no sexual content. Free in the browser on itch.io, in separate Japanese and English editions; it also runs on phones.
How it was built
Partially verifiedThe developer writes that the game was made as a test of “Claude 5.5” (as written), asking it to turn a novel posted on Pixiv into an RPG Maker-style game as-is. Both pages state that the code (Japanese: プログラム), 3D models, music and sound effects were made with Claude; the illustrations were made with image-generation AI and the original novel is the author's. In a reply on the English page the developer adds that everything except the story was made with AI, including the English translation. Which Claude product or model was used is not stated.
- DeveloperJapanese page: “プログラム・3Dモデル・BGM／効果音は、AI（Claude）で制作しています。” — itch.io
A browser game built on three.js (version r128, loaded from a CDN by the HTML5 build), made by asking Claude to adapt the developer's Pixiv novel into a short RPG Maker-style game. Claude made the code, 3D models, music and sound effects; the illustrations come from image-generation AI and the story from the developer's novel. The English edition's text was translated with AI.
- Engine / framework
- Three.js
- Languages
- JavaScript
- Team size
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“The code, 3D models, music, and sound effects were made by an AI assistant (Claude).”Verification notes: Story, controls, endings, content notes and AI use from the developer's Japanese and English itch.io pages and the developer's reply in the English page's comments, re-read on 6 Nov 2026 (both status Released, HTML5, genre Role Playing; changelog “v1.0 (Sep 2026) Initial release”, so no exact release date is recorded). “Claude 5.5” is quoted as the developer writes it. Code evidence: both pages say the code was made with Claude; no AI code percentage is given. Developer: the itch.io profile Giii3 game writes in the first person, says all games on the account are made with AI, and links a Pixiv account and the X account @giii3_tsfyara; in a comment the developer says they only speak Japanese. No real name, location or team size is given. The engine is three.js r128, loaded by the English edition's HTML5 build (observed); the build was checked for calls to AI services and none were found. “RPG Maker-style” (ツクール風) is the developer's description of the style; no RPG Maker assets or names are used in the game as far as the pages show, so no IP notice is attached. The itch.io rating of 3.0 from 7 ratings is on the English page; the Japanese page shows no rating. The game was not played.
Development history
- September 2026
Version 1.0 released (the changelog on both pages gives September 2026); the English edition followed on a separate page.
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.
itch.io
Free in the browser (HTML5); PC browsers recommended, phones supported with on-screen buttons. The Japanese and English editions are separate itch.io pages.
Not publicly available: Gross revenue.
itch.io
Free in the browser (HTML5); PC browsers recommended, phones supported with on-screen buttons. The Japanese and English editions are separate itch.io pages.
Not publicly available: Gross revenue.
Reviews & rankings
Not yet reviewed by our editors.
Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| TSF CAVE — Bill the Warrior and the Crest Curse by Giii3 game itch.io | Store page | Not confirmed | Nov 3, 2026 |
| テイエス洞窟 3D ― 戦士ビルと紋様の呪い by Giii3 game itch.io · Japanese | Store page | Not confirmed | Nov 3, 2026 |
| Giii3 game (itch.io profile) itch.io | Official site | Not confirmed | Nov 3, 2026 |
