CastleVille

CastleVille is a social network game made by Zynga's Dallas studio and was released on November 2011. It combines a number of elements from the company's other "Ville" range of games. On launch it had received a million "likes" on Facebook. By the end of its first month, it had become the fifth most popular game on Facebook with 26.5 million players. The game is a freemium game, meaning there is no cost to play but players have the option of purchasing premium content.