* 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 {{UsefulNotes/MSX2}} was practically dead as a gaming platform.
* NoExportForYou: Until its inclusion in ''[[VideoGame/MetalGearSolid3SnakeEater 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 Goriate (a tank) and Metal Gear Gustav (a smaller non-nuclear armed model of Metal Gear). There are actually various Goriate tanks inside Zanzibar Building in the final version, but they're just scenery. The concept for Metal Gear [=Gs=] was later recycled into the Walker Gears in ''VideoGame/MetalGearSolidVThePhantomPain''.
----