Snake's Revenge is a stealth action game developed by Konami for the NES. It was released in North America in April 1990 (under the Ultra Games label) and in Europe in March 1992 (under the Konami label). It was never released in Japan, despite the game being produced there.
Originally made as a direct sequel to the original Metal Gear, Snake's Revenge was the first game in the Metal 
Gear series made without the involvement of creator Hideo Kojima, although members of the development team previously worked with Kojima with the original MSX2 version of Metal Gear. It is not part of the series' canon and is considered part of a parallel universe to the other games. Despite its positive reception and reviews, the game is generally hated by fans of the series due to its removal from the series canon, and is considered by most to have nothing to do with the Metal Gear series at all.
Set three years after Operation Intrude N313 (the events of Metal Gear), the United States government discovers that an undisclosed hostile nation may have gotten ahold of the plans for Metal Gear and are secretly constructing weapons of mass-destruction. Solid Snake, the FOXHOUND operative responsible for the downfall of Outer Heaven, is recruited to lead a three men team consisting of himself and fellow operatives John Turner and Nick Myer, on a mission to infiltrate the enemy's base. The codename of the mission is Operation 747.
After the success the NES version of Metal Gear had in the Western market, especially in North America, where Metal Gear reportedly sold over a million copies, Konami commissioned the development of a sequel for the NES made specifically with the western market in mind.
Hideo Kojima, who was not planning on making a sequel to Metal Gear due to the relatively lower sales of the MSX2 version in Japan, ran into a member of the Snake's R
evenge development staff on a train ride in Tokyo. The developer told Kojima that he knew Snake's Revenge wasn't an "authentic Snake [game]", and was a fan of the original game, so he made a request to Kojima for the development of a true Metal Gear sequel. By the end of the train ride, Kojima had already developed the basic storyline for the entire game. The very next day, he went to his boss at Konami with a game plan, and was given the go-ahead to make Metal Gear 2: Solid Snake, then exclusively for the MSX2, and released in 1990.
As a result, the actual Metal Gear 2 was released exclusively in Japan for the MSX2, while Snake's Revenge became the Metal Gear sequel for the North American and European market, although Metal Gear 2 would see release in the English market 16 years later as a component of Metal Gear Solid 3: Subsistence.
Snake's Revenge plays essentially like an updated version of the original Metal Gear. Aspects from the MSX2 version of Metal Gear that were missing from the NES version, such as the ability to take food and ammo by punching enemies or the double exclamation mark alert, were restored in Snake's Revenge. The actual Metal Gear, which was missing in the NES version, makes an appearance along with a new prototype. The game also has more varied locations than the first Metal Gear, such as a jungle, a warehouse, a transport train, and a cargo ship filled with smaller mass-produced Metal Gear units.
