SimMars is a cancelled strategy game that was in development at Maxis around the same time as the release of The Sims. A trailer for the game was included on the SimCity 3000 CD. From the trailer, the premise of the game seemed to be a manned mission to the planet Mars, followed by a terraforming and colonization scenario, typical of the Maxis world-building game style. The game presumed to be an integration of previous Maxis titles, presented in 3D, possibly including elements of SimEarth, SimLife, and SimCity.