I still remember Candy Crush is the first game I installed from Play Store when I bought Android phone. I have crossed around 500 levels.
One thing that irritated me earlier about this game was that you have to send invitations to friends to unlock your levels else you have to pay to unlock. But I am glad I have found the easy way out. And the easy way to grab free lives and unlock levels for free is to adjust your phone clock settings ahead by few days and problem solved.
Moreover, I liked its user interface, the candies, the difficulty in crossing levels and many more things. It is definitely an addiction but a good one.