No. of Player：1 - 5
Playing Time：120 mins
西元 2400 年，人類開始對火星進行地球生態化改造。由地球世界政府出資成立了數個大型企業，斥資投入了提高火星氣溫、含氧量以及海洋覆蓋率的大型計畫，直到火星環境適合人類居住為止 。在重塑火星中，你扮演其中一個企業並在地球化的過程中共同合作改造，除了合作外還要爭取勝利分數，這些分數是一份榮耀，為了在互相競爭的過程中，比誰更能創造出更多對人類社會的貢獻。
In the 2400s, mankind begins to terraform the planet Mars. Giant corporations, sponsored by the World Government on Earth, initiate huge projects to raise the temperature, the oxygen level, and the ocean coverage until the environment is habitable. In Terraforming Mars, you play one of those corporations and work together in the terraforming process, but compete for getting victory points that are awarded not only for your contribution to the terraforming, but also for advancing human infrastructure throughout the solar system, and doing other commendable things.
The players acquire unique project cards (from over two hundred different ones) by buying them to their hand. The projects (cards) can represent anything from introducing plant life or animals, hurling asteroids at the surface, building cities, to mining the moons of Jupiter and establishing greenhouse gas industries to heat up the atmosphere. The cards can give you immediate bonuses, as well as increasing your production of different resources. Many cards also have requirements and they become playable when the temperature, oxygen, or ocean coverage increases enough. Buying cards is costly, so there is a balance between buying cards (3 megacredits per card) and actually playing them (which can cost anything between 0 to 41 megacredits, depending on the project). Standard Projects are always available to complement your cards.