Animal Crossing
Since the first game was released in 2001, five Animal Crossing games have been released world wide with each new game being more and more successful. It is a icon of casual gaming, with characters people love to love and characters people love to hate too (I'm looking at you Tom "The Loan Shark" Nook). With a fantastic distinct art style, and a fantastic soundtrack (supplied by the incredible K. K. Slider), its easy to see why this series is so beloved.