Remember the mobile title Final Fantasy XV: A New Empire by Game of War: Fire Age developer Machine Zone?
Final Fantasy XV: A New Empire is currently available on iOS and Android.
The game is pretty much a different animal from Final Fantasy XV, basically sharing only setting, music and characters.
The game has passed 20,000,000 downloads worldwide, and Leydon mentions that while it’s popular in Japan, North America is also a big market for the title.