SimMars was a strategy game in development at Maxis around the same time as the release of the wildly popular Maxis game, 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.