I-Ninja Codes and Unlockables (GameCube)

I-Ninja is a video game developed by Argonaut and published by Namco. It was released for the PC, PlayStation 2, Xbox and GameCube. A Game Boy Advance version of the game was announced, but it has been canceled. The game was advertised with the tagline "No one's taller than the last man standing." Although not too popular with the general public, it has gained a cult following. As a result of Sony Computer Entertainment Europe buying the exclusive distribution rights for Europe, that part of the world saw only the PlayStation 2 and PC versions released.

The main character in I-Ninja, called simply "Ninja," has a variety of acrobatic abilities that are used throughout the game. In addition to basic skills such as running and jumping, Ninja can jump a second time in the air, although this second jump is less powerful than the first. Ninja can also spin his sword around while midair for a limited time and use it to fall slower than normal to bridge large gaps. This sword-spinning can be done immediately after jumping, but is delayed if performed after a double jump.

Codes

In Game Cheats
During a mission pause the game and enter the following codes.

Note: Mission - Complete only works on normal missions and not on ''Collect the Red Coins'' or 'Find all Enemies'' Missions.

Hold R button, Y, Y, Y, Y, Release R button, Hold L button, Y, Y, Hold R button + L button, Y, X, Y - Characters will have big heads

Hold R and press B,B,B,X ,release R hold L and press Y,Y, release L then hold R and press B.B - Complete Current Mission

Hold L+R and press X,B,X,Y,Y,B,X,B - Sword Upgrade

Unlockables

Unlock Battle Arena
Do the following and the Battle Arena will be opened in Robot Beach.

Battle Arena - Get all normal grades, then get the master grade.

Check out the trailer for this fun game below: