The game follows the plot of the series, in story mode, starting from Naruto's graduation from the Ninja Academy to the end of the Chunin exams. The game retains the characters from the first installment, and added characters from the Chunin Exam arc. This installment allows four players to fight in multiplayer at the same time. Unlockable features in this game are acquired by accomplishing certain tasks to add them to the game's shop, and then using money won in fights to buy access to the features. Source: Wikipedia, "Naruto: Clash of Ninja (series)", available under the CC-BY-SA License.