Naruto: Ultimate Ninja 2 Cheats

Unlock all characetrs in USA version
Go to Naruto's house, go to the input screen, then put in the following password to unlock all characters.

Lightning-Snake-Rat-Dragon: Unlock all characters

Unlocking Extra S-Rank Missions
Go to Naruto's Room. You will be able to input seals by selecting one of 5 elements and then 3 different hand signs.

The Elements
Fire Wind Earth Water Thunder
The seals
1 2 3 4 5 6
7 8 9 10 11 12

Thunder 5/10/1: Unlocks a S-Rank Mission Vs. Gai
Wind 12/5/4: Unlocks a S-Rank Mission Vs. Sasuke

Unlockables
How to get all the Hidden Secret Scrolls

Here are the ways that you can get the hidden scrolls in each stage
Chuunin exam stadium go forward and back the hole 3 times
Forest of Death fit the fish that jumps up sometimes in the river 3 times(when it jumps)
Hero's Memorial stone hit opponent's support character 4 times
Hokage's face jump on the tree in the background 10 times
Ichiraku Ramen make all the lanterns red
Kazekage's place get 3 recovering items from the vending machine in the foreground.
Kikyoujyou(has 2 big fishes) stay on the tail of the fish for at least 2 counts when the wind is blowing
Konoha Forest destroy 5 trees thats in the fore and background
Konoha Hot springs dont destroy it but half destory the wall and the stand on both sides (fore BG)
Naruto bridge stay standing on the boat for 5 counts
Outer Tanzaku gai(with the snake) attack the snake 5 times
Sand place(with the tornado) destroy 5 of the stuff that's whirling in the tornado
Snow stage destroy 10 stuff that comes out in the fore and background(pots, shuriken targets etc..)
Tanzaku gai attack the slot machine 8 times
The Rainbow Icewall attack your opponent's support character 5 times
Training grounds destroy 8 stuff that comes out in the fore and background(pots, shuriken targets etc...)
Watch tower (with the frog and snake) go forward and back the snake and the frog with out touching the ground 3 times
Zabuza's secret hideout stay in the attic place above the place with the bed in the background