On July 17th, 2007, Konami announced Metal Gear Solid: Portable Ops Plus, an expansion of the original game, focused on online play. Among its new features, the expansion includes new characters, missions, tutorials for beginners, as well as a new single-player mode called “Infinity Mission.”
In Japan, Portable Ops Plus was released on September 20 in two formats: the expansion on its own and as a deluxe package that includes the original game and the expansion. The North American version was released on November 13, 2007. The European release date has not been officially given, however, Konami has stated that it will be available in PAL territories in spring 2008.