A scanned house is the museum in Biosphere 3
Branden Collins and four collaborators modeled an actual home as an explorable level, then hid a second world called AKUPARA inside it.
Many years ago, I remember a game designer positing that games shouldn't just build wars, but can go as small as a house. So Biosphere 3 takes us up on the challenge. It's built on a digital twin of a real residence, the Barton Hood house, rebuilt as a space you walk around. Inside it sits the Biodesign Museum, and inside the museum is a hidden dimension that drops you into a world the team calls AKUPARA. Architecture, then institution, then the trapdoor.

Museums have been putting games inside themselves for a decade; this inverts the arrangement, treating the museum as terrain and the visit as traversal. The version circulating now is a small ambient build — key-collecting, a mood ring, unlockable rooms, not much friction — which is the right scale of it. But the project page states an ambition well beyond a lobby demo: teaching contextual AI through gameplay, aimed at education, scientific research, healthcare, soft robotics and programmable biomaterials. Whether an ambient explorable can carry that is an open question.
A playthrough of the Biosphere 3 mini-game as Akupara. Video courtesy akupara.world.
Credits, since the announcement moves fast: Branden Collins is creative director, Derek Holguin handled design and development, Abi Lambert handled research and development, and Katie McManus handled art direction, with Zoo also credited on the project page. And a funny name collision: AKUPARA here is a fictional world, not the Los Angeles publisher Akupara Games, which has nothing to do with it.

One practical caveat. The announcement reel points to a download and specifies Apple silicon only, while the project page still lists the download as coming soon and offers a browser walkthrough instead. Expect to be routed to the browser version.
Architecture, biodesign, museums, trapdoors. The stuff that is obviously a game but never gets called one lands here first.