入画 · WITHIN
Explore 18 painting and landscape worlds through chapter tours, free roaming and walking, with driving in Roadster and boat rides in Sakura Valley.
Four 3D adaptations of tabletop toys: knock out ice beneath a penguin, guide rabbits through traps, balance astronauts on a platform and solve parking puzzles.

Details
The work description and facts above come from the upstream README. Any Astra Games guides are listed separately, with their own sources and verification notes.
Platform
Desktop, tablet and mobile browsers; free, no login. Local same-screen turn-taking for 2–4 seats, including computer opponents, plus solo puzzles; no online multiplayer. Demo not independently verified.
GPT-6 Astra
Creator statement — Creator reports that GPT-6 Astra autonomously implemented the games and carried out testing from toy descriptions and feature requirements.
Resources
Source and setup · Noncommercial license — Source available; noncommercial use is free, commercial use requires prior written authorization from the author. Built with: TypeScript, React, Vite, Three.js.
Explore 18 painting and landscape worlds through chapter tours, free roaming and walking, with driving in Roadster and boat rides in Sakura Valley.
Six browser games in one arcade, including mountain rally, snowboarding and antigravity racing; counted as one collection.
An unofficial multiplayer Chao Garden fan game: choose a Sonic character, explore the garden and interact with Chao.