Sid Meier's Civilization VI is now on sale, at $13.49. The Anthology and Platinum Edition are also on sale;
Great series, highly reccomend the games if you haven't played them yet. As noted in the comments, you might have claimed the game free on Epic Games during one of their giveaways.
Sid Meier's Civilization VI
Originally created by legendary game designer Sid Meier, Civilization is a turn-based strategy game in which you attempt to build an empire to stand the test of time. Become Ruler of the World by establishing and leading a civilization from the Stone Age to the Information Age. Wage war, conduct diplomacy, advance your culture, and go head-to-head with history’s greatest leaders as you attempt to build the greatest civilization the world has ever known.
Sid Meier’s Civilization VI Anthology
Sid Meier’s Civilization VI Anthology is the ultimate entry point for gamers new to one of the greatest strategy game series of all time. Explore new land, research technology, conquer your enemies, and go head-to-head with historical leaders as you lead your civilization from rocks to rockets. The Civilization VI Anthology includes all of the Civilization VI content released, including the Sid Meier’s Civilization VI game, six DLC packs*, the Rise and Fall and Gathering Storm expansions, and the full New Frontier Pass.
Sid Meier's Civilization VI : Platinum Edition
Sid Meier’s Civilization VI: Platinum Edition is the perfect entry point for PC gamers who have yet to experience the addictive gameplay that has made Civilization one of the greatest game series of all time. The package includes Sid Meier's Civilization VI, six DLC packs as well as the Rise and Fall and Gathering Storm expansions.