I-Ninja - Sword Upgrade

Press START during gameplay and enter any of the following codes:

Sword Upgrade

Hold L1 R1, Circle, Square, Circle, Triangle, Triangle, Square, Circle, Square

Complete Current Mission

Hold R1, Square, Square, Square, Circle, Release R1, Hold L1, Triangle, Triangle, Release L1, Hold R1, Square, Square

Big Heads

Hold R1, Triangle, Triangle, Triangle, Triangle, Release R1, Hold L1, Triangle, Triangle, Hold R1 L1, Triangle, Circle, Triangle

Unlock Battle Arena

To Unlock Battle Arena, earn all the Grades, Then you should get the Master Grade. The Battle Arena Will be open at Robot Beach

Super sword

To unlock the super sword beat the game twice and unlock the battle arena
Submitted by James