PSP: Metal Slug XXMetal Slug XX is an entry in the long running series of side scrolling shooters. It is a revised version of Metal Slug 7. The Peregrine Falcons, Marco, Eri, Clark, Tarma, Fio and Ralf, are once again running and gunning in colorfully hand drawn levels, throwing grenades, driving vehicles and slashing enemies. Metal Slug XX includes various single player features in the form of a Combat School that lets players return to previously completed missions