This month popular Metroidvania-meets-Dark Souls title Hollow Knight: Silksong?
Hollow Knight had sold over one million copies on PC alone, and that was all the way back in 2018. A lot of people have played it in the last few years, in other words.
On August 5, Hollow Knight broke its all-time peak concurrent player count the big charity Humble Bundle to fight coronavirus.
This time there doesn't appear to be any particular reason why so many players should suddenly be playing Hollow Knight. It may be related to excitement over the sequel Hollow Knight: Silksong, but as that game was a no-show for E3 2021 in June that may not be the answer.
We've reached out to Team Cherry to see if they have any idea for Hollow Knight's sudden surge in popularity.