Metal Gear Soild 4, commonly abbreviated to MGS4, is a stealth action video game developed by Kojima Productions for the PlayStation 3. Guns of the Patriots is the latest addition to the Metal Gear series and was directed by Hideo Kojima.
In MGS4, the player assumes the role of Old Snake, utilizing stealth, CQC and traditional combat techniques. The overhead camera of earlier Metal Gear games has been replaced by a third person camera, with First Person View and Over The Shoulder cameras optional.
A further addition to gameplay mechanics is the Psyche Meter. Psyche is decreased by non-lethal attacks, and is influenced by battlefield psychology. Stressors (including temperature extremes, foul smells and being hunted by the enemy) increase Snake's Stress gauge, eventually depleting his Psyche. Adverse effects include difficulty in aiming, more frequent back pain and the possibility of Snake passing out upon receiving damage. Among the available methods of restoring Psyche are eating, drinking, smoking and reading a magazine.