(PSP) Metal Gear Solid Portable Ops Plus

The game is set 6 years after the events seen in Metal Gear Solid 3 and follows Naked Snake during his investigation about a revolt in a South American base.
This is an expansion of the original game and includes new characters from the MGS saga, new items and weapons, new game modes; regarding the gameplay now up to 200 soldiers can be recruited, careers and skill levels for characters have been added and the player can obtain textbook items that raise soldiers stats.
It’s not necessary to have the original game but a save file can be transferred so an entire squad and any unique character from Metal Gear Solid Portable Ops can be used.