Sid Meier's Civilization is a turn-based strategy "4X"-type strategy video game created by Sid Meier and Bruce Shelley for MicroProse in 1991. The game's objective is to "Build an empire to stand the test of time": it begins in 4000 BC and the players attempt to expand and develop their empires through the ages from the ancient era until modern and near-future times. It is also known simply as Civilization, or abbreviated to Civ or Civ I.Civilization was originally developed for DOS running on a PC. It has undergone numerous revisions for various platforms (including Windows, Macintosh, Amiga, Atari ST, PlayStation, N-Gage and Super Nintendo) and now exists in several versions. A multiplayer remake, Sid Meier's CivNet was released for the PC in 1995. The N-Gage version was the last game released for the system in North America.