GameXplain writes: "But what about gamers who are interested in Peace Walker but have never played any of the previous games? Gamers who have no idea what a Metal Gear is. Or that Naked Snake and Big Boss are the same person. Or that the name Outer Heaven is significant to the games after Peace Walker. It can be daunting to jump into such a heavily serialized series and not know any of the background. For that reason, we are here to provide a way for those gamers to catch-up with the story leading into Peace Walker."