Play as Hatake Kakashi
Successfully complete the game as Naruto and Sasuke.
Bonus level
Successfully complete the game as any character to unlock a bonus mission at night for that person.
Gallery
Successfully complete the game as any character to unlock a gallery of pictures at the main menu.
Note: To unlock all gallery pictures, use all three characters to successfully complete the night missions with all 100 Leaf icons.
Sound test
Successfully complete the game with all 100 Leaf icons to unlock the "Sound Test" option at the main menu.
Fight against Gaara
Successfully complete the game as any character, then play again as that same person to fight Gaara as the end Boss.
Hints
Fourth Jutsu Scroll
In Leaf Village (the second last set of stages) stage one, you will find some Jounins on some boxes. Behind the second Jounin on the box is a small crawl way. Go through it and you will find a giant scroll. This unlocks the fourth Jutsu Scroll (Naruto: NineTails, Sasuke: Physical Combo, Kakashi: Chidori).