Metal Gear Solid was very well received, shipping more than six million copies, and scoring an average of 94 out of 100 on the aggregate website Metacritic. It is recognized by many critics as one of the best and most important games of all time, and heralded as the game which made the stealth genre popular. The commercial success of the title prompted the release of an expanded version for the PlayStation and PC, titled Metal Gear Solid: Integral; and a remake, Metal Gear Solid: The Twin Snakes was later released for the Nintendo GameCube. The game has also spawned numerous sequels, prequels and spin-offs, including several games, a radio drama, comics, and novels.