Domino-Chain — Andreas Röver, Volker Diels-Grabsch, Roberto Lorenz, Harald Radke and contributors. GPL-3.0-or-later.
Original puzzle rules, graphics, music and levels; English browser port uses C++17 filesystem, Asyncify and local file persistence. Lua 5.4.8 MIT; FriBidi 1.0.16 LGPL-2.1-or-later; FreeSans GPL with font exception; SDL2/SDL_ttf/SDL_mixer and linked dependencies retain their licenses. Rendered atlas from Debian domino-chain 1.1-6; exact upstream rendering source included.
Leaf lifecycle adapter GPL-3.0-or-later. Corresponding source and build instructions in source/.