The design of Metal Gear was based on one of Yoji Shinkawa's unused sketches of Metal Gear REX from Metal Gear Solid (1998).
Upon completing the game, a CODEC frequency can be seen in the closing credits. Tuning in during a new game will then launch a radio serial, with one episode available in each chapter. See also: Alternate Versions.
Unlike the Metal Gears from other games in the series, the name of this game's Metal Gear is never disclosed. However, promotional material reveals that it is called Metal Gear GANDER.