Imagine it's kind of a shared singleplayer experience. You play a game by yourself against computer controlled enemies, but you might see notes left from other

Imagine it's kind of a shared singleplayer experience. You play a game by yourself against computer controlled enemies, but you might see notes left from other players, and the ghosts of their last moments. Later you can use special items to hop into a game (co-op) or invade a random player's game (pvp).