'Mission' are the actual action sequences of the game, where the player must infiltrate an enemy territory or fight a boss, whereas 'Mother Base' is an army management mode similar to the briefing screen in Portable Ops. Peace Walker consists of two primary gameplay modes: 'Mission' and 'Mother Base'.

The player's partner is barely seen hiding on the other side of the truck. The image has Snake in Naked uniform hiding from a Peace Sentinels soldier, armed with an M60 GPMG. Snake and an MSF soldier conducting a Co-Ops mission.

The game received critical acclaim, but the PlayStation Portable version failed to match the commercial success of its console predecessors due to declining support for the system. Peace Walker is set in Costa Rica in 1974, and follows the exploits of returning protagonist Snake as he runs the mercenary unit Militaires Sans Frontières (Soldiers Without Borders).

The game was later released for the PlayStation 3 and Xbox 360 as part of the Metal Gear Solid HD Collection in North America and Europe and as a stand-alone retail release in Japan. It is the seventh Metal Gear game written, directed, and designed by Hideo Kojima, and the fifth installment of the Metal Gear Solid series, as well as the fourth Metal Gear game made specifically for the PlayStation Portable, following Metal Gear Solid: Portable Ops. Metal Gear Solid: Peace Walker is a 2010 stealth game developed by Kojima Productions and published by Konami.

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