Back on February 24th, Apple announced that their App Store was about to hit 25 billion downloads and unveiled an incentive for iOS users to start some fast & furious app downloading. Apple said that whoever downloaded the 25 billionth app would receive a $10,000 gift card redeemable for apps, eBooks, and iTunes music.

On Saturday Apple officially hit 25 billion downloads and the promotion ended. Apple.com displayed a message that read “A billion thanks: 25 times over.”

Now, Apple has announced the winner of the contest. The $10,000 iTunes gift card goes to Chunli Fu, and resident of Qingdao, China.

“We’d like to thank our customers and developers for helping us achieve this historic milestone of 25 billion apps downloaded,” said Eddy Cue, Apple’s senior vice president of Internet Software and Services. “When we launched the App Store less than four years ago, we never imagined that mobile apps would become the phenomenon they have, or that developers would create such an incredible selection of apps for iOS users.”

So, what was the 25 billionth app? Was it Facebook? Twitter? Words with Friends? Nope, the winning app turned out to multiple “game of the year” winner Where’s My Water?

The physics-based puzzle game is one of the most popular games in the App Store. It is available as a free download as well as for $0.99 for the full version.

The App Store has grown to 550,000 apps.