Rocket League has truly become a global phenomenon ever since it came out on the PS4 and PC last year. With the Xbox One release this year, the player count has risen a lot.
The Rocket League Twitter page announced:
Congrats everyone! We’ve officially reached 19 million players for Rocket League! We are humbled by your passion. Thank you!
The rise in sales could also be the fact that it is now available at retail stores. Even if you don’t have the internet to play/download the game, you can still enjoy it.