Metal Gear is an action-adventure stealth video game developed and published by Konami for the MSX2. It was released for the system in Japan and parts of Europe in 1987. Considered the game to popularize the stealth game genre, it was the first video game to be fully developed by Hideo Kojima, who would go on to direct most of the games in the Metal Gear series. A reworked port of the game was released for the Famicom a few months later, which later saw release in international markets for the NES over the following two years; this version was developed without Kojima's involvement and features drastically altered level designs, among other changes. An emulated Famicom version came with the special edition of Metal Gear Solid: The Twin Snakes on GameCube. A more faithful port of the MSX2 version was later included in Metal Gear Solid 3: Subsistence for the PlayStation 2, as well as in the HD Edition of the same game released for the PlayStation 3, Xbox 360 and PlayStation Vita, with these newer ports featuring a revised translation and additional gameplay features. The MSX version was also released for Wii Virtual Console and PC. Players control Solid Snake, an operative of the special forces unit FOXHOUND, who goes on a solo infiltration mission into the fortified state of Outer Heaven to destroy Metal Gear, a bipedal walking tank capable of launching nuclear missiles from anywhere in the world, as well as rescue a number of fellow agents who have been captured by the enemy. The game was a major international success, with the NES version selling 1 million units in the United States.