In Race for the Galaxy players build galactic civilizations using game cards that represent worlds or technical and social developments. Each round consists of one or more of five possible phases. In each round, each player secretly and simultaneously chooses one of seven different action cards and then reveals it. Only the selected phases occur. For these phases, every player performs the phases action, while the selecting player(s) also get a bonus for that phase. The Gathering Storm adds cards, a 5th player, and other ways to expand your universe.Rebel Vs. Imperium increases player interaction by adding takeover rules that allow players to conquer military worlds in other players tableaus.The Brink Of War adds new start worlds, goals, game cards, rules for galactic prestige, new solitaire game counters and drafting rules for six players. Alien Artifacts is incompatible with earlier expansions for the game, instead taking the game in a new direction. Race for the Galaxy: Alien Artifacts consists of two parts: 46 new cards including 5 new start worlds to add to the base set, plus a set of action cards and start hand for a fifth player. These can be used without the orb cards. 49 cards used to represent the Alien Orb which players jointly map and explore, gaining artifact tokens of various types that provide powers and VPs. Adds five new Explore action cards used in the orb game (instead of gaining an additional card or greater card selection). The orb game is optional and provides a new RFTG experience, as players have to balance how much effort and actions they wish to put into exploring the orb versus developing their empires.In Xeno Invasion after settlers encountered a violent xenophobic race, the "Xenos", the galaxy finds itself under relentless assault. No negotiation is possible. Long lost Alien secrets may hold the key to defeating these attacks.Two Bonus Space Fighter Pin Back Buttons