In the Nexum Galaxy "Asteroids" Expansion you will find a greater depth of gameplay in the story and asymmetric features of the Civilizations, with technologies, exploration, new resources, wormholes that will connect us to other Sectors, etc. With this expansion, Nexum Galaxy becomes a 4X game (eXplore, eXpand, eXploit and eXterminate). It also introduces an asymmetry in factions, technology, new resources. It increases replayability by adding new Systems to those included in the base game, as well as Event and AI cards. —description from the publisher