What is the difference between Metal Gear Solid Portable Ops and Metal Gear Solid Portable Ops Plus?

metal gear solid portable ops plus is the expanded vesrsion of metal gear solid portable ops,it has new features, the expansion includes new characters such as Genome and Gurlukovich soldiers from MGS and MGS2 respectively. There are also new missions, tutorials for beginners, as well as a new single-player mode called Infinity Mission.