Metal Gear Solid 2: Sons of Liberty is an action-adventure stealth game developed and published by Konami for the PlayStation 2 in November 2001. It is the fourth Metal Gear game written and directed by Hideo Kojima and is a direct sequel to the original Metal Gear Solid. An expanded edition, titled Metal Gear Solid 2: Substance, was released the following year for Xbox and Microsoft Windows in addition to the PlayStation 2.
The story revolves around the "Big Shell", a massive offshore clean-up facility seized by a group of terrorists who call themselves the "Sons of Liberty". They demand a massive ransom in exchange for the life of the President of the United States and threaten to destroy the facility and create a cataclysmic environmental disaster if their demands are not met. The motives and identities of many of the antagonists and allies change throughout the course of the game, as the protagonists discover a world-shaking conspiracy constructed by a powerful organization known as the Patriots.