like most paradox games its a deep and fantastic game that seems simple on the surface but hides a complexity many other non paradox games lack ,you also now have the option to now terraform mars and no longer be stuck inside domes,you can also have pets on the planet once terraformed (45 different animals to pick from),very happy i grabbed this for £15 with all the dlc aside from the stellaris dome skins on gmg (ends jan 2nd 2020)