44r0n7andClaude Opus 5.5
9291040ff0
- Liquids step up to 8 cells a tick toward a drop (fewer the thicker they are), and a top-layer grain looks 4 times as far for one, so pools empty and thin film drains. A 100-wide pool empties in about 50 s; the old code left 24-650 grains stranded on wide ledges. - Only a top-layer grain stepping sideways wakes the row ahead, so settled lakes still sleep. - World generation settles at the old speed: seeds make the same worlds as before. - Cooled steam under a roof no longer stays steam for ever (its heat area slept). - Raining clouds keep drifting at half pace and rain over a band either side, so a waterfall into a hot shaft no longer rains straight back on its own lake. - New test/t_water.js; t_weather rain-location checks; t_conveyors counts steam in flight; t_molds seeds the random burning-bed check. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Deepgrain Foundry
A falling-sand factory game in the browser, in the style of Sandustry.
Every grain of sand, ore, water and fire is simulated. You fly a small bot over a side-view world, dig with a resonance drill and vacuum up what breaks loose. You build furnaces from blocks, melt ore with coal and air, and cast the metal in molds. Then you sell bars, alloys and other goods at a trade dock, automating with belts, screw tubes, filters, fans, pipes and machines, until the land claim is paid off and beyond.
Play
python3 build.py
python3 tools/serve.py # builds, serves at http://localhost:8000 and rebuilds when src/ changes
Opening dist/index.html directly works too. The game is one self-contained page with no
downloads; sound and graphics are all generated in code. Saves stay in your browser.
- To keep or move a world, use Pause → Export world file.
- To load one, use Settings → Load a world file on the title screen, or Pause → Import world file during a game. World files exported from the claude.ai version load here too.
The controls are in the in-game notebook (N) under Controls. The basics:
- WASD to fly;
- 1–4 for the drill, vacuum, build and igniter;
- left and right mouse to use the tool;
- Q/E and R to change what it does;
- F to use things;
- Esc for the menu.
Develop
You need Node (tested with 22), Python 3, and Playwright for the browser tests and screenshots:
uv venv .venv
uv pip install --python .venv/bin/python -r requirements.txt
.venv/bin/python -m playwright install chromium
If uv is not installed, python3 -m venv .venv and
.venv/bin/pip install -r requirements.txt also work; then install Chromium as above.
After that, plain python3 works for every command below; the browser scripts switch to
.venv on their own.
python3 build.py # build dist/index.html
python3 test/run_all.py # headless test suites
python3 test/run_all.py --browser # plus the browser tests
python3 tools/shot.py shots/x.png --setup tools/scenes/clear-sky.js # a screenshot
The source is small JavaScript files with no dependencies or bundler:
src/sim/: the simulation;src/render/: drawing;src/ui/: the browser shell.
build.py joins them in the order given in src/manifest.json.
Documents
AGENTS.md/CLAUDE.md: how coding agents work on this project.tasks/: the to-do list, a kandown board (kandownopens it; seedocs/kandown.md).docs/PROJECT_MAP.md: where everything is.docs/DESIGN.md: what the game is meant to be, and the decisions made.docs/TESTING.md: tests, screenshots and pitfalls.docs/systems/: notes on individual systems.docs/history/requests.md: the owner's requests while the game was built.docs/agent-log.md: the work log.