I-Ninja

					
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
Große Köpfe
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