The guardian of Robot Beach and creator of Tekeyama, Yang, thanks Ninja by opening the gate to Bomb Bay, the location of the next Rage Stone.

Ninja then finds a submarine inside a giant bomb and fights the mechanical fish, Ventis for the next Rage Stone.

After saving the mountains, Ninja meets O-Dor's right-hand man, Malakai, who can control the elements.

Ninja starts to feel bad and then remembers Sensei saying that "Actions speak louder than words."

The main character in I-Ninja has a variety of acrobatic abilities that are used throughout the game to defeat the Ranx army led by Master O-Dor.

Occasionally, Ninja will encounter an enemy that will leap into the air with him (in anime fashion) to battle, and the two will remain suspended in a sort of flying void until the foe is defeated.

While in this void, Ninja flies around and can dash, slash with his sword, perform an unblockable but heavily delayed thrusting attack, and throw shuriken if he has them.

As the player progresses through the game he will gain access to more of these abilities; using them he can increase his strength, heal his life bar, ride a giant shuriken to quickly slay foes, or even become invincible, which allows him to greatly harm enemies in his vicinity without even touching them.

[5] On 3 July, Namco Hometek announced that Don Bluth and Gary Goldman would handle the game's 3D cutscenes.

[6] On 25 September, it was announced that Sony Computer Entertainment would publish the game in Europe as a PlayStation 2 exclusive.

"[25] GameSpot reviewer Ryan Davis said, "At first glance, I-Ninja may appear to be a simple action game designed for kids, but in reality, it is anything but.

The visual style may seem kid-friendly, but the level of challenge I-Ninja has to offer keeps the game interesting for a wider audience.