And four million people are playing every day.
Social games developer FreshPlanet launched SongPop in May, a name-that-tune music game available across Facebook, Android, and iOS, which has smashed past 25m unique players.
There's more than four million users competing against each other in a two-player battle every day, fighting to determine who has the best musical knowledge, and FreshPlanet says the number is rising.
Mathieu Nouzareth, CEO and co-founder, FreshPlanet, said: "SongPop is a simple and fun game that gives people the ideal interplay between social, mobile, and a quick hit of competition between people who love music.
"SongPop's success shows that, with the right idea, a small startup can succeed in connecting millions of people, reignite their love for their favorite hits and prolong that musical experience when the game is over by redirecting them to international and local e-retailers and subscription services including iTunes.
"Our goal is to continue increasing SongPop's music discovery potential and to continually build in new social features that keep players coming back."