Zynga&'s newest game, CityVille, is the fastest growing game in the company&'s history. But we already knew that. It had nearly 300,000 players in the first 24 hours, and 3 million daily active users in its first week.

But it&'s growth ramp keeps on going crazy. Now, not quite two days after it hit the 3-million user mark, it is already at 6 million daily active users, we&'ve learned from the company. To put that in perspective, that is four times faster than it took FrontierVille to get to 6 million daily active users, and more than five time faster than it took FarmVille.

Time It Took To Get To 6 Million Daily Active Users

FarmVille: 46 days FrontierVille: 32 days CityVille: 8 days

How did CityVille, a social city-building game, grow so fast It was the first time Zynga did an international launch in five languages (English, German, French, Spanish, and Italian), with a big marketing push and localized games in different countries. It also leveraged Zynga&'s other existing games to kickstart CityVille. With Zynga, every new game seems bigger than the last. It&'s kind of scary.