While most of my favorite games exist in isolated worlds, series that exist within a single universe would be my preference, usually where I follow different characters and locations between the games. This allows for the creation of an expansive universe and lore over multiple titles that always makes it a joy to jump into a new game or back into an old one to replay.

The Front Mission series is a great example of this, as all of the major conflicts across the five main games have an impact that can been seen in other titles -- this is especially true of the fifth title, which stands as a pretty well the perfect way to end a video game series, weaving itself around the events of the previous four.