Kingdom Hearts 0.2 Birth By Sleep is part of the Kingdom Hearts 2.8 HD Collection and while reportedly 3-4 hours long, it has some extra content to experience. One being a special boss rush mode upon completing the story once, where Aqua faces bosses new and old. It’s a nice bonus for those wanting to get more out of the game. It’s out now in Japan but will see release in North America & Europe later this month.