Maxis has released an Update for it’s city builder, SimCity.
The update allows you to take any online cities you have and have them in your offline/single player game where you can use mods and a bit more freedom to play as you want.
NEW: Added an option to allow Multiplayer Cities and Regions to be transferred and played in Single-Player Mode
For more information check out:
Update Notes – http://forum.ea.com/eaforum/posts/list/0/10242494.page
How to transfer your cities to Single-Player – http://forum.ea.com/eaforum/posts/list/10242493.page
SimCity is available on PC and Mac.