In Sword Art Online Hollow Realization Coop Story, a significant feature is the ability to form parties with other players. This allows for strategic gameplay as different characters can have different skills and abilities. Also, the coop story has a progression system that rewards teamwork. There are exclusive items and rewards that can only be obtained through coop play. Moreover, the story itself is engaging, with a variety of missions that demand communication and coordination among players.
Well, one main feature is the coop play. Players can team up with friends or other online players. Another is the unique story within the coop mode, which offers different quests compared to single - player.