Kojima Productions has announced that the Metal Gear series has sold over 31.1 million copies over its lifetime. The Metal Gear franchise was launched in 1987 for the MSX2 hardware.

The announcement came as part of a more general post on the Smithsonian Art of Video Games Exhibition, where Metal Gear Solid and Metal Gear Solid 2 will be displayed. Series creator Hideo Kojima is in Washington DC to participate in the public discourse about his games.

Source: metalgearinformer.com