Metal Gear Solid 4: Guns of the Patriots

Metal Gear Solid 4: Guns of the Patriots is the final canonical Metal Gear game to feature Solid Snake as the main character. The gameplay of the previous games have been kept along with some new features, such as the ability to roll on your back and also to hide in bins scattered around the environment. Most of the story and the relationship between the characters are explained through cut-scenes with a considerable length, so knowledge of the prior games is recommended to fully understand the story. The game also features a complex multiplayer mode entitled Metal Gear Online with some original missions based on the stealth aspects of the single-player games.

In 2014, the world is in chaos, the "war economy" plunging the world into never-ending battle. This fuels the need for private military companies, the five largest of which (together rivaling the power of the entire United States Army) are owned by a single mother company, Outer Heaven, with Liquid Ocelot at the helm. Liquid Ocelot, a fusion of the consciousness of Liquid Snake and the body of Revolver Ocelot, is once again set on world domination. Solid Snake, now also referred to a Old Snake due to his advanced accelerated ageing, is dispatched to assassinate Liquid Ocelot as a personal favor to Roy Campbell.