LogFAQs > #927352454

According to what I've read, the player can leave items or such behind for other players to help them on their journey. It's supposed to be an interactive community experience. Say one player decides to start building a bridge across a gap. Other players can chip in on their playthrough and help keep building that bridge. In time, that bridge will be complete constructed since a bunch of players worked on it throughout the course of the game's lifespan.

This is what Kojima is going for. He wants to have the players all come together to forge a path in the game in order to reach the destination. Of course, you don't have to take the path other players took and do your own thing. Thus, making it your own experience.

It sounds neat on paper but since most of the game looks like walking, I'm still not convinced.