Ok, the steps to beat Secret Level #10-
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In Puffle Rescue there is this secret octopus shadow in the Black Puffle levels. Keep following it and it will bring you to a secret level, and if you beat it you can get to the secret underwater room and you get a pin that looks like Rockhopper's Key with seaweed on it!
well a flower pot is thrown out of the truck in level four on club penguin
You go to the mine. You then play puffle rescue. Then play the black puffle version. Then you follow the octupus in the first level and find a secret room to get the black key and a key.
Feed Him!
a flowerpot