metal Gear Solid: Portable Ops Plus is a multiplayer-focused expansion
of 2006's Portable Ops. It is a standalone disc, though owners of the
first title are free to transfer characters. The "Plus" aspect
translates into new soldiers, updated play modes, additional maps, and
an experience-based progression system. The original game's Story Mode
has been dropped in favor of an Infinity Mode, which offers 50 stages of
sneak-and-shoot action. While the primary goal is to find your way
toward a randomly generated exit without alerting guards, a secondary
objective is to neutralize enemies so they can be added to your
multiplayer squad. As in