In Terraforming Mars, you play one of Giant Corporations, sponcored by World Government and work together in the terraforming process. The players acquire unique project cards by buying them to their hand. 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 certain parametres increase enough. Your income is based on your Terraform Rating, which increases every time you raise one of the 3 global parameters. On the game board, you compete for the best places for your city tiles, ocean tiles, and greenery tiles. When the 3 global parameters have all reached their goal, the terraforming is complete, and the game ends after that generation.
Video review: YOUTUBE