I bet it's some code too. Worked on a F2P mobile game, we bundled a tiny Lua engine, and them pushed various promotion screens as a bundle of resources (images

I bet it's some code too. Worked on a F2P mobile game, we bundled a tiny Lua engine, and them pushed various promotion screens as a bundle of resources (images) and lua code (screen layout, its preconditions and what's gonna happen after you click - game provided a small API that Lua called).