I’m a bit ‘over’ Candy Crush, but Bubble Witch Saga definitely has an addictive quality for me…

“If you have a mobile device, you’ve probably played the addicting game Candy Crush Saga. It seems like you can spend hours on it, and never get bored.

“Why is this? Anthony is here to tell you why the game is so addicting, and how King makes so much money.” – YT

“Currently, free-to-play games are making quite the killing in the marketplace, although it’s death by a thousand microtransactions.

“The idea, as the name suggests, is that you can play for free, but you can also pay for in-game conveniences, such as new content and time savers.”

- http://www.edge-online.com/features/the-psychology-of-free-to-play/