The Powder Toy — copyright 2008–2011 Stanislaw K Skowrenek; 2011–2026 Simon Robertshaw; 2016–2026 jacob1; and the contributors listed in the game's own Credits screen.
License: GNU GPL version 3 (LICENSE.txt). Linked libraries and their licenses: THIRD-PARTY-NOTICES.txt.
Upstream https://github.com/The-Powder-Toy/The-Powder-Toy revision 9ae1069a34562c72a9fd7802dc62198f0c703dbd.
This is the original game built for the browser with Emscripten 7.0.0, meson -Dhttp=false -Dstatic=prebuilt -Dbuildtype=release.
Leaf Arcade changes 8 November 2026: online features are switched off at build time (no sign-in, online saves or update checks; nothing is sent to powdertoy.co.uk); meson.build also exports Emscripten's FS so saves can be written before the page closes; the Open button shows local saves instead of the switched-off online browser; jsoncpp and Lua 5.2 are rebuilt with the same Emscripten as the game (leaf/rebuild-tpt-libs.sh) so local saving works; leaf-powder-toy.js and leaf.css add pause, stop, on-screen keys and frame sizing. The simulation, elements and interface are unchanged.
Complete corresponding source and build instructions: source/. Leaf Arcade is not affiliated with or endorsed by The Powder Toy developers.