Snake's Revenge is a stealth action-adventure video game produced by Konami for the Nintendo Entertainment System in 1990. It is the unofficial sequel to the original Metal Gear that was released in North America and the PAL region following the success of the NES version in the west. The game was produced without the involvement of series creator Hideo Kojima, who went on to develop a separate official sequel for the MSX2 titled Metal Gear 2: Solid Snake, which was released a few months later in Japan.
Like in the original Metal Gear, the player's objective is to infiltrate the enemy's stronghold while avoiding detection from enemy soldiers or surveillance devices. To fulfill their mission, the player must collect a variety of weapons and equipment, such as firearms, explosives, and rations, as well as card keys to access new areas. If the player is discovered by the enemy, the game will go into an alert phase, causing enemy soldiers to enter the screen and attack the player. The player must defeat a certain number of enemy soldiers to return to the infiltration phase or go to a different floor or area. In some cases, particularly when a guard sees the player and only a single exclamation mark (!) appears over his head instead of two (!!), the player can also escape the alert phase by simply moving to the adjacent screen.
A change to the original Metal Gear formula is the fact that the player now begins the game with a combat knife and a handgun already in their equipment. The A button is used for firearms and explosives like in the original game, whereas the B button is used for a melee attack with a punch or a knife depending on which one is assigned. The knife can be used to instantly kill guards at close range, but guards who are defeated with punches instead will occasionally leave behind an ammo box or a single ration unit.
Like in the original Metal Gear, Snake's maximum health and carrying capacity are determined by his rank, with the highest level being six stars. The player must rescue various hostages scattered throughout various areas until enough have been rescued for a promotion. The player will also encounter enemy officers in certain rooms who can be interrogated by applying truth gas unto them. Successful interrogations are counted alongside rescued hostages for promotions.
The interface of the player's transceiver has also been greatly changed from the original Metal Gear. Instead of dialing frequency numbers, Snake now has a set list of three contacts (John, Nick, and Jennifer) that he can communicate with and a radar that is activated whenever it detects a tracking signal transmitting from a nearby area. Unlike in the original Metal Gear, the transceiver cannot be used when the player enters alert mode.
Snake's Revenge features a varied progression of areas such as a jungle, a warehouse, a cargo ship, and a train, as well as the usual encounters with enemy bosses. In addition to the standard top-view areas, the player must also go through a series of side-view areas that play in a manner similar to Rush 'n Attack, in which Snake proceeds by walking, jumping, or crawling on his stomach while avoiding detection as usual. While in a side-view area, the player is limited to only the knife or handgun as their standard weapon, although plastic explosives can be planted as well to eliminate obstructions. Some of these areas require the player to crawl underwater to progress, resulting in the need for oxygen tanks to proceed without sustaining damage. Each time Snake's oxygen gauge runs out, a tank will be used automatically to refill the gauge until supplies last.
Three years after the events of the original Metal Gear, FOXHOUND discovers that a hostile nation in the Middle East may have gotten a hold of the plans for Metal Gear and are secretly constructing a new model. Lt. Solid Snake, the FOXHOUND operative responsible for the destruction of Metal Gear, is given orders to lead a three-man team to the enemy's base consisting of himself and two fellow operatives: John Turner, a former Navy Intelligence agent and infiltration pro; and Nick Myer, a weapons and explosive expert formerly with the Marines. The codename of the mission is Operation 747.
Snake infiltrates the enemy's jungle base with the help of John, who acts as a decoy by allowing himself to be captured. Snake eventually learns that the enemy is transporting their weapons, a set of mass-produced Metal Gear tanks, on a cargo ship. Snake blows up the ship's ammunition cache and escapes with the help of the team's helicopter pilot while the ship sinks.
The pilot informs Snake that the enemy has a prototype of the new Metal Gear 2 model in their main base and is told to contact their double agent, Jennifer, on the inside. As Snake goes deep into the base, he defeats an impostor posing as John, regains contact with Nick and eventually comes in touch with Jennifer, who reveals that the enemy commander is planning to launch nukes around the face of the globe. However, as Snake approaches the commander's lair, Nick is mortally wounded and dies, while Jennifer is exposed as a spy and gets captured. Snake confronts the enemy's commander, who reveals himself to be a cybernetically enhanced Big Boss, having survived his previous encounter with Snake. Snake defeats Big Boss and rescues Jennifer, who shows him to the storage facility where Metal Gear 2 is located. Snake destroys the weapon before its launch countdown is completed.
In the aftermath of Operation 747, the United Nations declares 'World Peace Day'. John Turner is declared missing in action and removed from Navy records, while Nick Myer is awarded three posthumous promotions.
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6 different online emulators are available for Snake’s Revenge. These emulators differ not only in the technology they use to emulate old games, but also in support of various game controllers, multiplayer mode, mobile phone touchscreen, emulation speed, absence or presence of embedded ads and in many other parameters. For
maximum gaming enjoyment, it's important to choose the right emulator, because on each PC and in different Internet browsers, the individual emulators behave differently. The basic
features of each emulator available for this game Snake’s Revenge are summarized in the following table: