To defeat the puffer fish, you have to feed it a smaller fish, the ones you catch in the game before the pufferfish comes.
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There is a instructions board that says instructions. Click on it to see how to defeat it
try your best
after you defeat sensei you get your ninja mask. you are then free to explore the ninja hideout or if you are a member play card jitsu fire
Not on the current Club Penguin but I think that they have old Club Penguin on Penguin Chat.
you must use bouncer welding dude and the robot deactivater