A diorama in the game: concrete, vines and fog. Image: Placeholders and Jimjum Studios, from the game’s itch.io page.

A black-and-white sandbox where you stack concrete into brutalist dioramas, tune the sun and fog, then walk through what you made.

The concrete is the point. The whole game is grayscale, so the only colour is the light and the green that creeps in. You click to place a block, hold to fill an area, shift-click to remove, hold and scroll to flip through variants. The Steam page describes more than 20 building blocks, among them stairs, bridges, towers and nature, and, the page says, there is no goal and no right way to build.

There are four tools: build, photo, light and nature. Light is a sun dial with fog and cloud sliders, and the Steam page adds a day and night cycle with controllable rain. Nature adds plants and trees, so a block of concrete can end up looking like a ruin the forest has been working on for years. Photos are saved to a local folder, and worlds can be exported from the menu.

Then you drop into first person. You can run, jump, crouch and slide, and wall-run and wall-jump up your own architecture, which turns a pretty model into a place with a route through it. The latest update added a mouse-wheel field-of-view and focus control, so you can frame a shot as you go.

It is less unfinished than a 0.3 version number suggests. The itch.io build is listed as released, at version 0.3.1 and a minimum of $5, for Windows, macOS and Linux (downloads run 90 to 114 MB). It is also young: the page was published about three weeks ago and is updated almost weekly. A Steam page went up on 16 October, with no release date or price yet. The developer says a full version is coming from Jimjum Studios and that itch.io buyers will get early-access keys for it.

One caveat on provenance. The itch page states that no generative AI was used. A commenter says an earlier version of the page said the game was AI-assisted; the page now says all of the game’s assets are human-made, and that the developer sometimes needed help to fill gaps in their coding knowledge.