The Metal Gear franchise has done remarkably well for itself since its introduction 25 years ago. Including every single Metal Gear release, from the original Metal Gear
on the MSX2 through Metal Gear Solid HD Collection
for the 360 and PS3, Hideo Kojima's groundbreaking masterclass in theatrics and stealth has amassed 31.1 million units sold, as of December 31, 2011.
To put that in perspective via a completely arbitrary and meaningless number crunch, that's 3.8 Metal Gear games sold for every person living in New York City. Put another way, if you took every Metal Gear game ever sold and laid them all end to end, the resulting line of cartridges, discs and boxes would stretch all the way from San Francisco to somewhere else