Both editions are free software under the GNU General Public License, version 2 or later. Copyright (C) 2026 Michael Slater (Heisenberg).

Free Pascal 3.2.2 and Lazarus 4.4 (LCL, GTK2 on Linux). Source: brokenseal-0.6.1-source.tar.gz from the downloads page (also installed with the game: /usr/share/doc/brokenseal/ on Linux, the docs folder on Windows).

make            # bin/brokenseal
make test       # the rules tests and the desktop tests (about 17,000 checks, including a 10,000-month run)
make gui-test   # plays the real window under Xvfb

docs/BUILD.txt in the source has the details, including the Windows cross-build and the MSI.

TypeScript, bundled with esbuild. It needs Node.js 18 or later; the Pascal cross-checks also need Free Pascal and the desktop source.

npm install
npm run build          # the page, in dist/
npm run build:server   # the online games server, in dist-server/
npm test               # every check

The browser edition is checked against the desktop edition's own code:

• the desktop's test suites, ported with the same number of checks;
• whole campaigns played by both engines from the same start, with every kind of player order, compared byte for byte after every month;
• hex battles, compared step by step and picture by picture;
• 625 screens, compared pixel by pixel;
• the interface and the online server, played through by scripts and in a headless browser.

The rule for changes: anything changed in one edition is changed in the other, and the checks must still match. Online play is the one part that exists only in the browser edition.

The online games server is in the browser edition's source, in server/. It runs the same game code as the page, under Node.js, with no other software needed. server/README.md describes its settings, its files and its admin commands.