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. It is open only to members.

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).

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 '''in Puffle Rescue

'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.
 * This was the only party room during Cave Expedition that didn't have a free item.
 * There is much to do here.
 * The waterfalls may have been the Twin waterfalls that were at the Adventure Party 2009 at the forest. Meaning that maybe, the Forest is above the Hidden Lake.
 * In the bottom left if you looked closely, there is a broken Aqua Grabber.
 * Many nice penguins try to block the entrance to The Underwater.
 * If you try to click the key hole in the door, it will move up slightly, it will open, 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.