Alternate Costumes:
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On the character select screen, highlight a character and press Y.
Unlock Extra Characters:
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Rock Lee – Beat Zaibuzan in story mode without using continues, and
then beat Rock Lee when he appears.
Kyuubi Naruto – Unlock Rock Lee, and then beat the game with all
characters. Now highlight Nartuto on the character select screen
and press X or Z.
Sharingen Kakashi – Beat the game with Kyuubi Naruto, and then beat
the game with Kakashi. Now highlight Kakashi on the character select
screen and press X or Z.
Unlock Hinata:
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Clear story mode using Sakura. Find this fighter by highlighting
Rock Lee and pressing X.
Unlock Sound Test:
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Beat the game with every default character.