OpenSupaplex browser edition — Leaf Arcade

OpenSupaplex by Sergio Padrino, copyright 2020, GPL version 3.
https://github.com/sergiou87/open-supaplex
Pinned commit: bad56a4e174e628643995284ea55d4c49af3137c
Original Supaplex: Philip Jespersen and Michael Stopp; PC code Robin Heydon,
PC graphics Matt Smith; music/FX David Whittaker. Original resources retain
separate rights and are supplied locally by the player, never hosted here.
The GPL engine license is not a license for the original artwork or levels.

Browser modifications by Leaf Arcade contributors, 2026, GPL-3.0-only:
Asyncify build, simulation-clock pause, read-only state inspection, local pack
import, browser file persistence, keyboard/touch and lifecycle integration.
No gameplay rules or original puzzle layouts are rewritten or simplified.
Original engine copyright headers are retained. Full license: COPYING.
Corresponding source and build instructions: source/index.html.

Compiled with Emscripten 4.0.23, SDL2 2.32.8, SDL2_mixer 2.8.0,
libmodplug 11022021, and the upstream MIT ini parser.
JavaScript adapter bundles fflate 0.8.3 (MIT).
Full third-party notices: THIRD-PARTY.txt. Library sources: source/.
Emscripten toolchain: https://github.com/emscripten-core/emscripten/tree/4.0.23
The cover is an original CC0 Leaf Arcade geometric title card.