SimMars (lost build of cancelled strategy/simulation game; 2000)
SimMars is a cancelled strategy/simulation game by the creators of SimCity and The Sims series Maxis.
The gameplay consisted of colonization of a small area of a virtual Mars as part of a manned mission. The gameplay happened in a full 3D environment, unlike SimCity titles of that time.
No full screenshots of the game exist, but a trailer can be found on some SimCity 3000 CDs. There was also a website of the game at http://www.simmars.com but it's not reachable any more. Howver, it is archived on the Wayback Machine. Some information of the game can however be found on IGN in form of an article and database entry about the game:
http://www.ign.com/articles/1999/07/20/simmars
http://www.ign.com/games/simmars/pc-12191
http://simsuniversal.orgfree.com/simmars.html
A few screenshots and concept art can be found online:
Development of the game was presumably stopped because Maxis wanted to focus more on their surprisingly successful The Sims series.
An unofficial modification, made by fans for SimCity 4 also exists, but is not connected to this official game at all. Most screenshots one can find online are of this modification.