17 December 2013
Worldwide, Candy Crush Saga is estimated to make £610,000 ($1,000,000) per day from its users, according to Appdata. It is one of a growing number that is free to download but generates extraordinary revenues by nudging addicted players into paying more to get gizmos that help them progress through difficulty levels.
http://www.bbc.co.uk/news/magazine-25334716