Mobile app how it works?

Hello , recently found themselves playing the Emperor and concubines , was very interested in what you can create such a game and how it works
Just noticed that the game weighs far less than some of exactly the same game(it weighs 30 MB, the Hiking game weigh 300 MB) , despite a very good image.
As she arranged the communication between the client and server ?
Also noticed that it works much faster than some other games (like faster Supreme Mandarin)
Reread all that you wrote , it sounds like advertising (not advertising)
And another question , what size team is needed to create such games?
Wanted more screenshots to upload , but gives an error