As said, Factorio's core is compiled binary, with a lot of customizable Lua on top. Fun story: Somebody independently recreated the core engine themselves to

As said, Factorio's core is compiled binary, with a lot of customizable Lua on top. Fun story: Somebody independently recreated the core engine themselves to prove a point about multi-threading. Imagine recreating an entire game engine in 50,000 lines of C++ to prove a point, yeah, it happened: https://www.reddit.com/r/factorio/comments/jizq1b/comment/ga9ih96/ https://www.reddit.com/r/factorio/comments/jizq1b/comment/ga... What a legend!