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Castlevania Chronicles
Sound Select:
While you're selecting Original Mode or Arrange Mode, hold L1+R1 to unlock an extra option that allows you to change the music played in the game.

Art Gallery:
For each stage that you complete in Arrange Mode, one illustration by Ayami Kojima, the artist behind Akumajou Dracula X: Gekka no Yasoukyoku/Castlevania: Symphony of the Night and Akumajou Dracula X68000/ Castlevania Chronicles, will be unlocked at the Special Option screen under the Option menu.