for the PlayStation 2. The official series ended with Naruto Shippuden: Ultimate Ninja 5 (released in Japan as Narutimate Accel 2 ).
What you are likely looking for is a of Ultimate Ninja 5 . These mods are created by independent teams like the Narutimate Modding Team to add newer characters and features to the classic PS2 engine. Best Sources for the "Ultimate Ninja 6" Mod Download Game Ps2 Iso Naruto Shippuden Ultimate Ninja 6