How to effectively advertise a casual game (free-to-play) on android and iOS?

Question

Marketing

How to effectively advertise a casual game (free-to-play)?
I believe that even before the development of the game, it is necessary to consider the marketing strategy. I was wondering what is the average ROI of free-to-play games? After all, the profit comes not from the purchase of the application (when it is easy to count), but from the internal purchase)

Answer 1

Try reading this book