premise: Metal Gear Solid is an action-adventure stealth video game produced by Konami Computer Entertainment Japan and released for the PlayStation in 1998. The game was directed, produced, and co-written by series creator Hideo Kojima, and serves as a sequel to the MSX2 video games "Metal Gear" and "", which Kojima also wrote and directed.
hypothesis: Metal Gear Solid was the first in the Metal Gear series which contains ten games.
reason: It is not certain how many games there are in the series.