Colonies is another expansion to the great terraforming mars system. In this add on to this great game you add space colonies such as the moon to your game. Trading with the colonies creates wealth and resources too help you in your company’s quest to terraform mars and become wealthy in the process. This is a great add on and can be used with any or none of the additions. Using fleets to trade with other colonies to create a second earth for mam to live is actually very cool though.