Metal Gear Solid: Peace Walker is a stealth action game with a third-person view. The gameplay is similar to the early Metal Gear Solid games, with minor changes being made. Movement and actions are carried out using analogue controls. The player cannot move or shoot while lying on the ground or against a wall. The player can customize the control system similar to the games Portable Ops, Guns of the Patriots or Monster Hunter.
The Portable Ops team system in the original game has been replaced by a co-op mode. Two players participate in the main missions, while boss missions (called Co-Ops) involve four players. The player can choose one of the camouflage options.