Unlock Battle Arena How to unlock: Earn all the Grades, Then you should get the Master Grade. The Battle Arena Will be open at Robot Beach.
Rage Up (I-Ninja) Description: Ho to raise your rage in the game. How to: Try destroying inanimate objects like barrels, flowers, grass, mushrooms, computer monitors, and anything else you can destroy. This will allow you to easily raise your rage level without having to fight.
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