Built from the ashes of Blizzard's cancelled Titan project, the company's team-based online FPS Overwatch has now attracted over 7 million players worldwide in the week following its May 24th launch.
It's a bit interesting that Blizzard is choosing to crow about the number of people playing Overwatch, rather than the number of copies sold.
Presumably the vast majority of those millions of players bought a copy of the game (which costs anywhere from $40 to $130) for either home console or PC, since no piece of it has been freely accessible since the close of the game's final beta test.
In fact, some may well have bought more than one copy, in order to play with friends on different platforms.
For some deeper thoughts on why the game's design may prove appealing to a wide audience, and whether it has legs as an eSport, check out Gamasutra's recent roundtable discussion of Overwatch.