I don't know about Sim City, but it's very _very_ common for games to write everything in C++/OpenGL and just use a thin layer to bind against the underlying pl

I don't know about Sim City, but it's very _very_ common for games to write everything in C++/OpenGL and just use a thin layer to bind against the underlying platform where needed. In fact, other than using a premade engine like Unity, I'd say that's the only sane way to do mobile development.