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he is so joking. maybe he said that because there is treasure there. the real answer is that behind the door is a secret room. there is also a free pin. it is the key that you earned as a pin. when you click on it. it is called the mossy key pin

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13y ago
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11y ago

You mean behind the door of the hidden lake? Nothing that special, its just an underwater room with an underwater background and some fishes.

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Q: What is behind the door in club penguins hidden lake?
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What is behind the door in the hidden lake?

Behind the door lies a hidden room called the underwater room in club penguin. Many girl penguins like to play "mermaids" in this room. There is also a pin in here called "moss key'' pin.

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Not really, there's only a moss key pin and an underwater room (only for members).

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go to the puffele rescue and the type what you just wrote in youtube

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Play puffle rescue on the black puffles and find the key on the first level

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