Creating a sequel to a popular title is a huge undertaking. Not only do you need to maintain the spirit of the original but you need to instill a sense of freshness to it by introducing new things to the already popular formula. Imangi does a great job of this with Temple Run 2.
Angry Birds is arguably the biggest brand in gaming right now. Forget Call of Duty and its $60 price tag, Angry Birds is free and just about everyone in the world has played it at some point or another. The little cartoon birds have permeated everything from clothing to birthday parties making them a cultural touchstone. Their expansion into everything reminds me a lot of another famous brand, one that has stood the test of time for 35 years. And of course I am talking about Star Wars.