According to a report by Social Game Info, Final Fantasy Brigade has crossed the 500,000 user mark. This amount comes less than two weeks after the game started on DeNA’s Mobage service.
Upon reaching the mark, Square Enix announced a few special campaigns happening in the game that will focus on classic summon characters Shiva and Ifrit. The game is currently available in Japan, though its not unreasonable to assume that a release in the West will come sometime.
Source: Andriasang.com