Civilization is a franchise composed primarily of a series of turn-based strategy video games and associated media. The core of the franchise is a series of six titles for personal computers, released between 1991 and 2016. Sid Meier developed the first game in the series and has had creative input for most of its sequels. The official titles of the series, core games, and most spin-offs include his name, as in Sid Meier's Civilization. In addition to the main titles, the franchise includes multiple expansion packs and spin-off games, as well as board games inspired by the video game series. The series is considered a formulative example of the 4X genre, in which players achieve victory through four routes: "eXplore, eXpand, eXploit, and eXterminate".