This refers to copies shipped, rather than sold through to end consumers. Given the declining significance of boxed disc copies, the difference is likely negligible.
The Twitter post states:
“We could not have achieved this without our incredible fans! With gratitude from the entire Resident Evil family.”
Players take on the role of Ethan Winters, who is searching for his wife on a derelict plantation. It is the first mainline entry in the series to feature a first-person perspective.
There are other games in the Resident Evil series that have reached 10 million copies, but those are the remakes of RE2 and RE3.
