it already has
press L1 and L2 at the same time.
You have to go staight to the wall that the leaf villiage arrow points to and press square
Beat story mode twice Sasuke Uchiha: Finish the story mode twice
Naruto, Kakashi, Sakura,Rock Lee, Neji, Might Guy, Garra, Kankuro, Kisame,Itachi, Sasuke,Choji,Shikamaru
Unlock Itachi and then R1+R2 and btw if you unlock Itachi Kisame is unlocked to and when you unlock them both you have all the characters.
Complete the game once.
Uzimaki chronicles 2
YOU HAVE TO BEAT ALL MISSIONS (INCLUDING S RANK MISSIONS) AND THEN BEAT KASKASHI GAIDEN WHICH YOU WILL THEN UNLOCK ITACHI, KISAME AND THE 2 SURVIVAL LEVELS
Beat story mode twice
Can neji use byakugan In Naruto Chronicles 2 ?
complete all missions and go and beat kakshi saga
I don't see why not. You could use Kyuubi on uzumaki chronicles, so you should be able to use cursemark sasuke, but this is only a guess.