(PSP) Metal Gear Solid Peace Walker

The second official game made for PSP and the first one directly by Kojima (he didn’t make Portable Ops cause it was working on MGS4).
The story takes place in 1974 soon after the events occurred in MGS3, Snake runs a mercenary unit in Colombia and moves to Costa Rica when a secret paramilitary group faces the scene; there are two main modes, the “Mission” includes Main Ops, where the player follows the primary story, and Extra Ops, where the optional missions varies from simple target practices to obtain secrets documents; the “Mother Base” is similar to Portable Ops army management, the player can capture military vehicles, develop items and weapons from blueprints obtained from missions.
Peace Walker was highly acclaimed at the time of its release and it’s considered part of the main story among the other episodes released on home systems.