For the next five days, a set of apps at the Play Store will be $0.25 instead of their normal prices. For example, on the first day of the sale, the apps include Sudoku, Angry Birds Space Premium, and Symphony of Eternity.
In addition, Google will be rolling out a number of other 25-based promotions. For example, the company will be offering some special collections, such as "25 movies you must own," "25 banned books," "25 albums that changed the world
and the Play Store's "25 top selling magazines."
Jamie Rosenberg, Director of Digital Content for Google, said "Twenty-five billion is more than twice the distance, in miles, that the Voyager 1 spacecraft has travelled since its launch 35 years ago. It’s the amount of time, in minutes, that have passed since some of our earliest ancestors began to set foot in Europe. And now, thanks to all of you, it’s a Google Play milestone. We look forward to the next 25 billion."