As of March 2013, Candy Crush Saga surpassed FarmVille 2 as the most popular game on Facebook, with 46 million average monthly users.
Basically, Candy Crush saga has more than 800 levels and now, the recent news is that, the game has been update again with 15 extra level, which is from 875 to 900. It seems, apart from the addition of levels, there is no other changes has been done in the update.
Coming to the game play, each level has a game board filled with differently colored candies, and might contain obstacles.
The basic move of this game is horizontally or vertically swapping the positions of two adjacent candies, to create sets of three (or more) candies of the same color. Each level contains a certain objective that must be completed in a given number of moves.
In November 2013, the game had been installed 500 million times across Facebook and iOS and Android devices. According to Business Insider, Candy Crush Saga is the most downloaded iOS app for 2013.