Nearly 4 million copies of Rocket League have now been purchased across PC and PS4, according to Psyonix's marketing VP, Jeremy Dunham. 

Speaking on a recent Kinda Funny Twitch stream, Dunham said the 4 million figure doesn't include PlayStation Plus downloads, adding that the game's continued success means a retail version is now in the works. 

Dunham also revealed that Rocket League has brought in over $70 million in revenue since launching last year. 

As of December 2015 Rocket League's revenue stood at nearly $50 million, suggesting the game, which recently launched on Xbox One, has scooped up an extra $20 million in just over two months.