Demon’s Souls showed the world a great and innovative multiplayer feature that most of the industry has ignored: the ability to leave messages for other players. It’s a great feature because it creates a sense of community through user generated content, and that content is easy to make. It’s actually so easy to make that it’s more like content manipulation than content creation, but that’s part of the appeal. Everyone can participate. Despite this, the only game that I’ve played (or seen or heard of) since then to incorporate a similar kind of content manipulation is SSX, which then tweaks the feature so that it becomes something quite addictive.
In part, this is what makes the multiplayer in SSX so great. It’s a collection of lesser used multiplayer innovations pieced together in such a way that each one compeiments the other, while also avoiding the most persistent problems that plague multiplayer games.