in the mine
It is in the mine.
Next to Puffle Rescue.
eather bean counter or puffle rescue i don't know for sure.
Its in black puffle rescue near the end
go to the mine and where the puffle rescue table is, go under the coats.
you find th key in puffle rescue with black puffles and go for the shadow
It will come out on the 15th of March 2010, Club penguin time. The time of day is not specified.
Play the black puffle rescue and follow the Shadow of the octopus and then you are in the secret room and you have the key.
You can buy it in the clubpenguin store
If you exclude "of these" from your question, the answer is Jet Pack Adventure, Catchin' Waves, Ice Fishing, Puffle Rescue, Hydro Hopper.
you can't
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!