Metal Gear 2: Solid Snake is a 1990 overhead action-adventure stealth video game developed and published by Konami for the MSX2 computer platform. It serves as a direct sequel to the MSX2 version of the original Metal Gear, written and designed by series's creator Hideo Kojima, who conceived the game in response to Snake's Revenge, a separately-produced sequel that was being developed at the time for the NES specifically for the North American and European markets. The MSX2 version of Solid Snake was only released in Japan, although Kojima would later direct another sequel titled Metal Gear Solid, which was released worldwide for the PlayStation in 1998 to critical acclaim. This later led to Solid Snake being re-released alongside the original Metal Gear as additional content in the Subsistence version of Metal Gear Solid 3 for the PlayStation 2 in 2005. It was also included in the HD remastered ports of Metal Gear Solid 3 released for PlayStation 3, PlayStation Vita, and Xbox 360, and was given a stand-alone re-release in Japan as a downloadable game for mobile phones and the Wii Virtual Console.

Set in 1999, a few years after the events of the original game, Solid Snake must infiltrate a heavily defended territory known as Zanzibar Land to rescue a kidnapped scientist and destroy the revised "Metal Gear D". The game significantly evolved the stealth-based game system of its predecessor "in almost every way", introduced a complex storyline dealing with themes such as the nature of warfare and nuclear proliferation, and is considered "one of the best 8 bit games ever made."