Since its launch on June 1, Zynga's latest Facebook title, Empires And Allies, has scored 32,974,509 monthly active users.
The free-to-play strategy game, which Zynga describes as "CityVille meets Risk" is averaging 6,580,479 users every day, and had reached 10 million users after just nine days.
The game is available in 12 languages, and its Los Angeles development team includes members who have previously worked on Command & Conquer and The Lord of the Rings: Battle for Middle-Earth.
While the game is free-to-play, users can purchase virtual currency to build new army units quickly or power ups to give them an advantage over other players.
Zynga has previously found success on Facebook with Farmville, which currently has around 40 million active users, and CityVille, which leads the pack with 90 million.