SimCity the game that EA has stated that is not possible offline when the game released because it required too many calculations handled by the EA servers for it to not function offline. Has changed its course and will now offer a offline mode, the patch will be available as a free update as part of the SimCity Update #10. Heres a bit on what they had to say on the SimCity Blog regarding the huge move to go back offline.
Yes, Offline is coming as a free download with Update 10 to all SimCity players. When we launch it, all of your previously downloaded content will be available to you anytime, anywhere, without the need for an internet connection. We are in the late phases of wrapping up its development and while we want to get it into your hands as soon as possible, our priority is to make sure that itâ€™s as polished as possible before we release it. So, until thenâ€¦ testing, testing and more testing. As one of the final steps, weâ€™re putting Offline into the hands of some of our most hardcore players, the DevTesters. This group of volunteers is going to put Offline through its paces before we release it.