Story wise, you are Solid Snake, a rookie member of the elite unit FOXHOUND, your task is to infiltrate Outer Heaven, a fortress somewhere in the South African jungles, rescue fellow FOXHOUND member Gray Fox, and destroy the secret weapon, a super computer dubbed Metal Gear

Metal Gear was originally developed for the MSX (a computer popular in Japan and Europe from the mid-80's to early 90's) by famed designed Hideo Kojima