First of all, you HAVE to be a member. On puffle rescue, go to the black puffle level. Once you pass level 1, don't go back. Follow the squid shadow and there will be a secret chamber. I SWEAR IM NOT LYING!!
To get the key, play level one of Puffle Rescue. (Black Puffle) NOTE: You must be a member. Get the puffle, but stay there and don't go back to the starting place to move on to level two. You will...
you have to be a member to do this, go to the mine and play puffle rescue. play the one that has a black puffle. then find the puffle on level one but don't go back to where you started! then a squid...