* DoingItForTheArt: This game was made after one of the developers of ''VideoGame/SnakesRevenge'' told Creator/HideoKojima that he should make a true ''[[VideoGame/MetalGear1 Metal Gear]]'' sequel, and the game was released at a time when the {{MSX}}2 was practically dead as a gaming platform.
* NoExportForYou: Until its inclusion in ''Metal Gear Solid 3: Subsistence''.
* SequelFirst: ''VideoGame/MetalGearSolid'' included a plot synopsis of this and its predecessor in order to give newcomers to the series a bit of a background.
* WhatCouldHaveBeen:
** One of Kojima's early plot ideas for ''Metal Gear 2'' involved a terrorist takeover of a nuclear weapons testing site within the United States. This idea would later recycled for ''Metal Gear Solid''.
** Two other vehicular bosses were planned in addition to the Hind D and Metal Gear D. The Goliath (a tank) and Metal Gear Gustav (a smaller non-nuclear armed model of Metal Gear). There are actually various Goliath tanks inside Zanzibar Building in the final version, but they're just part of the scenery. The concept for Metal Gear Gustav was later recycled into the Gekkos from ''VideoGame/MetalGearSolid4GunsOfThePatriots''.
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