I-Ninja [GC]
During gameplay press START and enter any of these codes:
Complete Current Mission
Hold R Button, B, B, B, X, Release R Button, Hold L Button, Y, Y, Release L Button, Hold R Button, B, B
Level Skip:
While playing, hold R and press B, B, B, X. Release R then hold L and press Y, Y. Release L then hold R and press B, B.
Sword Upgrade:
While playing, press pause then hold L + R and press X, B, X, Y, Y, B, X, B.
Big Heads:
While playing, hold R and press Y, Y, Y, Y. Release R then hold L and press Y, Y. Release L then hold R + L and press Y, X, Y.
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
Destroying sentinels
This only works sometimes and only works on the level heart attack. First, go near the spot where you have to run up the walls. Then, after the sentinel turns around and sees you, run up the walls. It will look up and fall over.
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