Released only in Japan, Kingdom Hearts Final Mix has several events and a number of gameplay tweaks that are not in previous releases. Spoken dialogue is in English, with Japanese subtitles. New scenes, clarifying certain plot points, such as Riku's journey and foreshadowing of Kingdom Hearts II, were included. A gameplay option allows the player to skip cut scenes after seeing them once. The optional bosses first included in the English version were introduced to Japanese players for the first time, along with "Unknown", in an attempt to raise interest for the sequel.