Steam now offers the Steamplay release of Sid Meier's Civilization V, meaning a Mac OS X edition of the turn-based strategy sequel is now available, which is free to those who have already purchased the Windows edition of the game through Valve's digital distribution service. Word is: "Become Ruler of the World by establishing and leading a civilization from the dawn of man into the space age: Wage war, conduct diplomacy, discover new technologies, go head-to-head with some of history’s greatest leaders and build the most powerful empire the world has ever known."