https://www.gamespot.com/articles/rocket-league-hits-a-huge-new-player-milestone/1100-6455882/

Rocket League, the popular soccer-with-cars game, just continues to grow. It has now passed 40 million players, developer Psyonix reported on Twitter. This is up from 33 million back in July and up from 38 million just two weeks ago.

Back in July, Psyonix reported that players had collectively logged 1.5 billion matches since Rocket League launched in 2015. In the just five months since then, gamers played 500 million more matches to bring the total to over 2 billion.