Naruto Shippudden Ultimate Ninja Impact at Amazon
YouTube user pneumoniasasuke1 has made a gameplay video of the 4th and final secret mission for Naruto Shippuden: Ultimate Ninja Impact! The purpose of these missions is to try and earn get a nice little PSP wallpaper image as a reward for completion. If you recall, Secret Mission 1 features a wallpaper of Naruto, Minato, Jiraiya, Kakashi, and Bee. Secret Mission 2 has a wallpaper of the Shonen GaGan crew and Secret Mission 3 has a PSP wallpaper of Akatsuki with the V-Jump logo.
This 4th and final secret mission by Saikyou Jump features Team Guy in a chibi fashion and was released back on December 13th. As far was we know these missions are exclusive to the Japanese Playstation Network.