Naruto - Platform: Gameboy Advance

Unlock Kakashi: 
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In order to unlock Hatake Kakashi beat the game with both Naruto 
and Sasuke. 

Unlock Sound Test Mode
---------------------- 
To successfully unlock the Sound Test Mode, just collect all 100 
Leaf Symbols and it'll appear on the Main Menu. 

Unlocking Gaara
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To fight the hidden Boss Gaara, beat the game with somebody and 
then start over as them. The levels will change, and the final 
boss will be Gaara 

2nd Mission
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Beating the game one time with any character will unlock a 2nd 
''night-time'' mission for that character. The levels will remain 
the same, but the final 3 bosses are different. 

Portrait Gallery
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Beating the game one time will unlock the portrait gallery, 
where you can view portraits for all the characters you meet, 
and the bosses you've beaten. 

Secret Jutsus
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On the Leaf Village Arena level, 1st Area (first level where 
you get the wind scroll) near the end of the level, you will 
fight a jounin-level enemy (big green ninja) and to the right 
of the platform he is standing on, there is a small crawl-way. 
Inside of the room, there is a large invisible scroll. When you 
acquire it, that character will permanatly learn level 4 Jutsus 
(if you save your game.)