Call of Duty was already massive. With its mobile game, now it’s everywhere.

“Call of Duty: Mobile” debuted Oct. 1, 2019, as a free-to-play game. That same day, it reached 1 million downloads. Nineteen days later, it had topped 100 million. That number swelled to 500 million in May 2021, Activision announced. By comparison, the franchise’s mainline entries, which have been steadily releasing since 2003, have sold over 400 million combined copies to date. While that’s a staggering sum for the premium versions on consoles and PCs — producing billions of dollars in revenue over the years — Activision’s relatively nascent mobile game has already generated over a billion dollars in revenue before the conclusion of its second year on the market.