SimMars is a mod for SimCity 4 taking the game to Mars. It will bring new buildings, transportation systems, user-interface and music and will replace the Maxis SimCity 4 content as far as possible, giving you the feeling to play a colony on Mars. The mod is still at beta stage. Beta 3 was released in October 2010.
Download the SimMars region pack and add 7 new exciting regions to your game! All regions have been rendered from real Mars height maps and represent existing geographical locations. The pack comes with an installer and automatically installs in the correct folder. SimMars Beta 3 is required. If you are on a slow internet connection and downloading large files is unpractical you can still enjoy those maps by rendering them yourself within the game. To do this follow the instructions in the ReadMe file of SimMars Beta 3.