Imagine how much code was put into this app

Answer 1

But they also use libraries and ready-made plugins which saves them hours and hours of code.

Answer 2

imagine you can learn to build this

Answer 3

They most likely use a framework similar to that of game engines and a large team of people to produce these apps in quantative numbers with relative speed.

Answer 4

it would be created by the code ruby and yes it would be pages and pages of code