Hidden Lake

The Hidden Lake is a room for both members and non-members. It was first opened in the Cave Expedition where it was only accessible to penguins who completed the treasure hunt but it later returned for all penguins to enter at their own will.

On the right side of the Hidden Lake, there is a door to the Underwater Room, which is open only to members. As of the Island Adventure Party 2010, there is a permanent entrance to the Hidden Lake from the Forest, making it not really "hidden" anymore.

Appearance
There are two waterfalls in this room and a pool of seawater that leads to the Members-only Underwater Room to the right. There are glittering heaps of treasure all over the floor and coral beds under the water. The door to the Underwater Room is locked to all but those who got the secret key from inside the underwater room (only accessible through the Black Puffle Puffle Rescue).

Pins
Candy Apple Pin

Underwater Room
The Underwater Room is locked until the Moss Key Pin has been gotten and if you try to go through the door without the pin, a note will be there that says:

To find the key to this door

Seek the black Puffles

And follow the shadow...

But watch out for

(unreadable text)

Trivia

 * Members could buy a Deep Sea Diving Suit for 50 coins when this room was open during the Cave Expedition.
 * In the bottom left if you looked closely, there is a broken Aqua Grabber.
 * If you try to click the key hole in the door, it will move up slightly, this only works for players who haven't gotten the key.
 * It is unknown how the Aqua Grabber got here, as the Aqua Grabber still floats at the Iceberg. It is possible that there is more than one Aqua Grabber.
 * You can teleport there using the EPF Spy Phone.
 * The first ever pin to be placed here is the Candy Apple Pin.
 * The rumor that the Hidden Lake is under the Forest was proven TRUE as a path under a rock in the Forest leads to the Hidden Lake.

Parties

 * At the Island Adventure Party 2010, it turned into a Mermaid's Cove.

Pins

 * Candy Apple Pin

SWF

 * Hidden Lake during the Great Cave Expedtion
 * The current Hidden Lake
 * The Island adventure party