Nintendo Gamecube - I-Ninja Cheats To achieve these results enter the following code:  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. 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.

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