That depends on the code. Neverball has acquired a high level of portability thanks in large part to SDL2 and OpenGL (ES). So compiling to Emscripten was mostly

That depends on the code. Neverball has acquired a high level of portability thanks in large part to SDL2 and OpenGL (ES). So compiling to Emscripten was mostly about rearranging the pieces that were already there. My original patch was surprisingly small. (https://github.com/Neverball/neverball/commit/517c93b7bcf63f4f6b50f182f57509b97dabf5dd https://github.com/Neverball/neverball/commit/517c93b7bcf63f...) I would say I spent more time on integration with browser APIs, so it would behave and feel more like a web app.