This app was mentioned in 5 comments, with an average of 1.20 upvotes
So the job description is clear requires strong knowledge in maths with implies 3d and Unity which is a cross platform games engine mainly mobile.
I know the obvious thing is gem sales but lets try and be positive...in my down time I played Phantasy star online 2
PSO2 has a mobile app which is amazing cals hit gives you access to a whole other game that gets you in game items for completing daily tasks and even just logging in :)
https://play.google.com/store/apps/details?id=com.sega.PhantasyStarOnline2es&hl=en
how ever it does also allow you to buy in game currency too.
The thing to keep in mind is games engine...games engine normally == game
maybe even in app to game chat like WoW
there is so much they can add onto of the gem store
not to mention access to the TP from your phone...making gold while not he Bus oh ya...
"Official"? What do you mean? PSO2es is by Sega. The English patch is run by the same stupendously dedicated team that are enabling you to enjoy the JP PC version that everyone's playing on.
What I linked you to is the tool to download the English patch for the game. The actual game is official, and it's here.
You mean this? https://play.google.com/store/apps/details?id=com.sega.PhantasyStarOnline2es
It's JP only.