|"Crystal Tower" from the Nintendo DS release of Final Fantasy III|
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- “This is the final theme song of FF III's Crystal Tower. The clear melody and tones cheer on our heroes even after the many sorrows they have borne.”
- —Theatrhythm Final Fantasy description
As with the rest of the soundtrack, "Crystal Tower" was remastered by Nobuo Uematsu for the Nintendo DS release of Final Fantasy III, and was released as part of the Final Fantasy III Original Soundtrack, of which it is the fifty-second track. This remastering possesses uses synthesized chorus to simulated a vocal chorus and was given a more epic feel.
The original release of "Crystal Tower" was included in Dissidia Final Fantasy as a bonus battle background theme, unlockable through the PP Catalog for 500 PP after completing Shade Impulse. As with all bonus tracks from Dissidia Final Fantasy, this theme was not included on the game's original soundtrack.
Like every other of Dissidia's tracks, this version returns in its prequel. Its cost has been reduced to 150 PP from the PP Catalog, and is now available from the start.
When purchased, it acts as in the original game, but can also be the default music for battles taking place at the Dissidia instance of its debut, the Crystal Tower.
An arrangement of "Crystal Tower" by Yuzo Takahashi titled "Guardian of Light 2", is featured in this spin-off game, but was not included in the game's original soundtrack. It is similar to the remastering of the theme for the DS release of Final Fantasy III, but possesses higher quality and has no synthesized vocal effect.