First you have to be a member.
Then you have to play black puffle puffle rescue.
After you get the first puffle, wait for a big shadow.
Follow it, and when you are following it you have to stop at bubbles and be over them when they pop. If you don't then you will disappear and have to start over.
Then get the key and finish!
Hidden Lake in the left
Hidden lake by bthe ladder to get to the forest
you get the pin that is by the clam
go to the mine, there will be a hallway with lights go in there. there is a stream go over that into a cave looking thing. that is the hidden lake.
you open up the door in the hidden lake
Well the Club Penguin hard hats are in the room right before you go to the hidden lake!
you dont need one :]
kinda
You go to the nighclub. go up to the games room ( i dont know the name of it) play one of the games im not sure which one. after you completed the game you will get the key to the door in the hidden lake
Only members can.
No
First you need to be a member in the clubpenguin,then you must have at least thirty-four friends and one of your friends must be a member .After that take your member friend to the hidden lake and there is an secret door that requries you to all the missons of puffle rescue.The last two missons requiers to be a member so that will give you the key to the door!!!