The american version is sooo gay, the Japanese version is soo much better, they took out all the good boss fights....including Demon Gaara, 2nd Form Orochimaru(on the snake), that guy that's Itachi's partner (i forgot his name)...it's not as good.
I'm not sure if you even get the Super Rasengan either (well they call it power strike now)
and its not hard...I beat that game in japanese in 2 days and it was a whole lot harder than the US version
just go to the shop and stock up on items, I had no idea what I was buy but I know that they were healing and mp items soo when you get close to death just use them