One of the early hits on the iTunes App Store and a strong leader in Android game sales, the Doodle Jump games quickly turned into the definition of a successful mobile game. As of the end of 2011, over 15 million copies of the arcade game have been sold across various marketplaces, and it has remained one of the best-selling iOS games since its launch. With such a simple premise and creative visuals, it's no wonder Doodle Jump has gained such enormous popularity. Now, with mobile markets still growing, Doodle Jump's various incarnations have spread to include NOOK and Kindle Fire!