According to the text, the popularity of Candy Crush Saga is...

The Phenomenon of Candy Crush: Why Is the Game So Popular?

     In 2012, Candy Crush was released on Facebook and was later converted to smartphone format for people to play on the go. In 2013, the game reached real prominence and became the most popular game on Facebook. It’s no surprise then that so many people play this game on their phones. Candy Crush Saga has changed the way many of us kill time on commutes, or even in the toilet. I don’t remember the last train journey I took where at least one person wasn’t playing Candy Crush on their phone. I’m sure almost every reader of this article will have either been invited or invited others to play Candy Crush via Facebook in an effort to get more lives or even levels.

    Despite being incredibly similar to many games over the years, Candy Crush Saga has added new depth to the genre, with seemingly unlimited combinations of new scenarios and concepts. So, this mixture of simplicity and variety is what makes Candy Crush so unbelievably popular.

     As a result, Candy Crush Saga shows no signs of slowing down. New levels are generally released via the Facebook version every three weeks, with new levels also being made frequently available for the smartphone version. With 6.7 million active users, the developers are rumoured to be earning $633,000 per day from Candy Crush users.

Adapted from http://metro.co.uk/2013/09/27/