There are two primary ways to reach this state: manually grinding through optimized missions or importing a pre-made save file.
Downloading a completed save file allows you to start the game with all characters at level 99 immediately.
Naruto Shippūden: Ultimate Ninja Impact (2011, PSP) is a single-player action game featuring a “Musou-style” combat system. Progression involves leveling characters (max Level 99), unlocking support ninja, and obtaining rare items. Due to the significant grind required to reach the maximum level—especially for all 20+ characters—many players seek or create “Level 99” save data files.