* AwesomeMusic: [[AwesomeMusic/MetalGear See here.]]
* EvenBetterSequel: Or SurprisinglyImprovedSequel for those who weren't impressed by ''Metal Gear''. This game features a more complex plot, better graphics, the introduction of the radar, the ability to crawl, enhanced guard AI, and tons of little details. The improvement is so vast that first time players have been stunned by ''the opening credits sequence''.
* HarsherInHindsight: Calling Miller during the fight with Big Boss will have him state that Big Boss was a monster. Granted, it's in the context of Big Boss's SuperStrength, but this line becomes significantly harsher after ''Peace Walker'', where he was a former ally of Big Boss and one of the founders of Outer Heaven.
** Likewise, calling Kasler during the fight has him mentioning a false rumor that Big Boss has cybernetic limbs to replace the ones he lost during the fight in the previous game. ''VideoGame/MetalGearSolidVThePhantomPain'' revealed that he ''did'' lose an arm and had it replaced with a mechanical one, long before the events of the first game.
* HilariousInHindsight: A bit of a stretch, but in Metal Gear 2, there were tanks in the hangar ([[WhatCouldHaveBeen and originally planned to be fought against]]) that were referred to as Goliaths. The next medium to use the name Goliath in regards to a Main Battle Tank is the TV Drama/TV adaptation "{{Kings}}".
** Big Boss's comment about soldiers being dead weight out of the battlefield becomes somewhat hilarious after watching the Mega64 trailer on ''VideoGame/MetalGearRisingRevengeance'', where Raiden bombed at absolutely every single job his unemployment adviser offered him up until getting a job as a cybernetic private military contractor. It also goes int a bit of HarsherInHindsight, as the unemployment manager when first meeting Raiden mentions attributes to Raiden's 4 year unemployment to being the result of an implied terrible economy (at the time the trailer was released, the American economy, not to mention most of the world wide economy, especially the European economy, was undergoing a severe economic crisis).
* MemeticMutation: The phrase "It's not over yet!", used in every Metal Gear Solid game released after this, excluding the Acid games and Ghost Babel.
* OlderThanTheyThink: A ''lot'' of VideoGame/MetalGearSolid came from this game, including the bit of using the game's packaging to learn a frequency number.
* TearJerker: Even for an 8-bit game, it has them. The examples would be the deaths of [[StarCrossedLovers Gustava Heffner and Gray Fox]].
** Gustava's backstory reveals that she fell in love with a man named Frank Hunter, whom she intended to elope with and cross the border with him. Unfortunately, she was denied permission, and was outcasted as a result. Her death by Metal Gear D hits Snake hard when he reveals that he didn't want to see a woman die in front of him in ''VideoGame/MetalGearSolid''.
** For Gray Fox, he's a ShellShockedVeteran who cannot stay away from war as he thought he cannot function outside the battlefield. As the pilot of Metal Gear D, he ended up killing the woman he loved. He thought making a woman happy is something he cannot do. The theme that plays in the conversation between him and Snake is appropriately called "Tears".
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