[[caption-width-right:276:Lt. Solid Snake is a martial arts expert. He destroyed Metal Gear 1 and is now the leader of Operation 747.]]
'''''Snake's Revenge''''' is an alternate sequel to the original ''VideoGame/MetalGear'' released exclusively for the NintendoEntertainmentSystem in 1990. It was the first ''Franchise/MetalGear'' sequel made by {{Konami}}, produced without the involvement or consent of the original game's creator, HideoKojima and in response to the success of the NES version of ''Metal Gear'' in the overseas market. Despite Kojima's lack of involvement, the existence of ''Snake's Revenge'' would inspire Kojima to design his own sequel to his game, resulting in the creation of ''VideoGame/MetalGear2SolidSnake'', relegating ''Snake's Revenge'' to non-canon status.

Three years after the Outer Heaven incident, FOXHOUND has learned that a nameless hostile nation has obtained the plans for Metal Gear. Solid Snake is called back into action to infiltrate the enemy territory. With the help of two new FOXHOUND members, weapons expert Nick Myer and infiltration specialist John Turner, as well as a double agent named Jennifer, Snake learns that the enemy have not only mass-produced the original Metal Gear model, but are now testing a new upgraded prototype called "Metal Gear 2."

''Snake's Revenge'' is pretty similar to the original ''Metal Gear'' in terms of game design, although it is much closer to the original [=MSX2=] version than the NES version. This time, Snake has an option to switch between his punches or using a knife for close-range attacks (the latter allows him to kill enemies in one stab). In addition to the regular overhead areas, ''Snake's Revenge'' also feature several side-view segments akin to Konami's own ''VideoGame/RushNAttack''.

!! ''Snake's Revenge'' features examples of:
* AlternateContinuity: Although, it wasn't intended to be one at first.
* AttractMode: A diagram of Metal Gear 1's specifications.
* BlackDudeDiesFirst: [[spoiler:Inverted. Nick is actually the last of Snake's support team to die, which is way late in the game, assuming that John had died.]]
* CableCarActionSequence: The last base prior to reaching the enemy's fortress consists of three buildings that are connected by cable cars. To go from one building to the next, Snake must hitch a ride atop one of these cable cars and avoid being spotted by the enemies inside the car during the side-scrolling transition sequences.
* CanonDiscontinuity: Produced without the involvement of series' creator Hideo Kojima. He would go on to develop ''Metal Gear 2: Solid Snake'' as the official sequel to the [=MSX2=] original. ''Snake's Revenge'' never even had a Famicom release.
* DynamicDifficulty: The number of enemy soldiers that appear during alert phases increases by two for each promotion the player gets. In other words, the higher Snake's rank becomes, the more reinforcements he'll face when spotted by the enemy.
* GuideDangIt: The player's objective in the first desert compound is to find a hidden underground tunnel that leads to the enemy's train station. However, none of Snake's allies tells him exactly how to find the hidden entrance, not even Jennifer (whom Snake is told to contact at the end of the previous section). The player has to destroy sandbags on the grounds using explosives until finding the entrance.
* HostageSpiritLink: Averted. Unlike the original ''Metal Gear'', hostages are immune to the player's bullets.
* TheKeyIsBehindTheLock: The keycard that opens the entrance to the first base is inside the base itself. [[spoiler:As a result, the only way Snake can infiltrate the base is by using an ally as a decoy.]]
* LocomotiveLevel: After the first desert compound, Snake must hitch a ride on a train to rescue a captured ally.
* LostForever: If you get aboard the ship without picking up the suppressor or the sub-machine gun, you will lose any chance of picking them up. And woe to those who forget to pick up the mine detector before sinking the ship, as the next area starts in the middle of a minefield. The train section is at least generous enough to allow you to pick up any essential items you might've missed out on after defeating the boss before reaching the next area.
* MissionControl: Averted. Snake's radio contacts consists of two other field agents (John and Nick), a double agent in the enemy's main base (Jennifer), and the nameless helicopter pilot who drops him off at the beginning of his mission.
* OneWingedAngel: After Big Boss' initial form is defeated, he transforms into a cybernetic behemoth who claims that he has no weak points. It is also to be noted that this is the only ''Metal Gear'' game period to utilize this.[[note]]Unless one counts Colonel Volgin merging with the Shagohod's wiring or Peace Walker transforming into a quadruped.[[/note]]
* OvertookTheManga: ''Snake's Revenge'' was made before Kojima developed his own [=MSX2=] sequel and takes the game's plot into a different direction that makes both games irreconcilable with each other.
* PointOfNoReturn: Unlike the original ''Metal Gear'', ''Snake's Revenge'' doesn't allow backtracking once the player reaches certain areas, particularly when infiltrating the cargo ship carrying the mass-produced Metal Gears after leaving the first enemy base, and later on when Snake must hop aboard a train transporting a captured ally.
* RandomDrop: Brought this feature back after the first NES game removed it .
* ReverseMole: Jennifer ("Your Person") is helping out Snake from inside the enemy's base. [[spoiler:Her cover is blown and she is [[DamselInDistress captured]] by Big Boss just before the final battle.]]
* RevengeOfTheSequel: The game's title makes little sense, considering it is [[spoiler:Big Boss who wants revenge against Snake for turning him into a cyborg. This was years before Big Boss was established to be the original Snake.]]
* SuspiciouslySpecificDenial: At one point, a captured ally tells Snake via radio that his present area has no enemies or traps. [[spoiler:He turns out to be an enemy spy.]]
* TakingYouWithMe: The final fortress has two fake hostages who will blow up if Snake attempts to rescue them. Also, some of the enemy reinforcements are literal suicide bombers.
* TokenMinority: Nick is the only black guy among Snake's support crew.
* TruthSerums: An actual play mechanic unique to this game. Certain rooms are inhabited by enemy officers who don't offer any resistance against Snake, but will refuse to divulge any information to him unless the player uses a "Truth Gas" canister, in which case the officer will reveal a piece of information vital to Snake's mission. Interrogated officers are counted towards the player's promotion alongside rescued hostages.
* UnexpectedGameplayChange: The side-view segments.
* UniversalAmmunition: Like in the original, ammo boxes provide bullets for all of Snake's firearms (the handgun, the machine gun and the shotgun). Averted with the flare gun, which can only be loaded with flare bullets.
* WithThisHerring: Subverted. Snake begins his mission already equipped with a knife and a handgun (which are also Snake's main weapons during side-scrolling segments), although he still needs to procure a suppressor (which is provided by Nick after infiltrating the first base) and all the other weapons on his own.
* TheVeryDefinitelyFinalDungeon: The enemy's headquarters is a large medieval castle, a huge contrast to the military bases, vehicles, and outdoor environments that the player infiltrates prior to that point.
* WhatHappenedToTheMouse: [[spoiler:John is never seen again after Snake defeats his impersonator and is declared MIA in the ending. It is unknown whether he was killed or kept alive after his capture, or if there was even a real John to begin with.]]
* YourPrincessIsInAnotherCastle: Snake succeeds in sinking the enemy's shipment of Metal Gears only to find out that the enemy have already completed the prototype for the new model, Metal Gear 2, in their headquarters.