Zynga calls the Pictionary-esque Draw Something the fastest growing mobile game of all time.
"We believe it's not only the fastest growing original mobile game of all time - 50 days to hit 50 million downloads - but one of the fastest growing web sensations that we've seen," Zynga said in a statement.
Social gaming giant Zynga acquired OMGPOP, the creator of Draw Something in March for $180 million.
According to Zynga, more than 6 billion drawings have been created since launch.
The ad-free 99 cent version of Draw Something is the top paid download in Apple's App Store, as well as the store's top grossing and top free download. The social game is also available in the Android marketplace.
Have you downloaded Draw Something yet? Why do you think the game is such a viral download? Tell us in the comments.
BONUS: 25 Best 'Draw Something' Sketches From Mashable Readers