A garden with roots.

Stillwater is an offline adaptation of correafreisztav/nonaga, a JavaScript implementation of Nonaga. The board game was designed by Víktor Bautista i Roca and published by Steffen Spiele. This is an independent adaptation, with no affiliation or endorsement.

Open source

Upstream source is licensed under GNU GPL version 3. Source revision: 1e4740cc899640388ae331525233bb1e2c9f17db, updated October 27, 2026. Observed GitHub stars: 0 on November 9, 2026.

The complete modified source is provided in readable form as game.js, style.css and this site's HTML. No build tools or dependencies are needed. Copy these files and the three WebP assets beside index.html to serve the game from any static web root.

This adaptation

Original movement, board-connectivity, winning-group and computer-player logic are retained. Firebase, rooms and all online multiplayer code were removed. The interface, keyboard support, destination previews, undo, practice finish and hint controls were added. The edge-disc rule was corrected to at most four adjacent discs, following the designer's published rules.

The ivory porcelain disc, teal lily bud and coral maple piece were made using OpenAI GPT image generation for this adaptation. All three are optimized WebP images bundled locally, used as the actual game pieces. No upstream illustration or commercial game art is included. The adaptation is distributed under GPL-3.0.

The game runs entirely in your browser, with no account, backend or remote asset requests. A reload starts a fresh game. Metadata tags: github-source, game.