Naruto Shippuden: Ultimate Ninja 4 known in Japan as Naruto Shippuden: Narutimate Accel (ＮＡＲＵＴＯ－ナルト－ 疾風伝 ナルティメットアクセル Naruto Shippūden: Narutimetto Akuseru) is the fourth installment of the Ultimate Ninja series, and the first in the Accels completely redone and improved scenes from Naruto Ultimate Ninja 3. The game features over 52 characters (including transformations) and also has an original story mode new to the series that takes place between the Sasuke Retrieval Arc and the Shippuden Arc called The Black Shadow.
The game introduces Naruto Shippūden characters for the first time, featuring over 52 playable characters. Other changes include the introduction of fixed ultimate jutsu, which change as health decreases or if the player enters any secondary mode. The graphical style of the game has also been toned down, retaining the anime look. Hero's History Mode includes completely redone and improved scenes from Naruto Ultimate Ninja 3 as well as redone CGI scenes.
A new mode in the game called Master Mode also allows players to compete in challenging missions, explore the massive world of Shippuden and level up character. The game covers half of the "Kidnapped" arc from the Shippuden storyline.
Source: Wikipedia, "Naruto: Ultimate Ninja", available under the CC-BY-SA License.