Before Card-Jitsu: The Ninja Quest is a book released by Club Penguin.
Sensei, master of the elements, needs to find a place where ninjas can begin to study the ancient art of Card-Jitsu. He has chosen you to help him in his search for the perfect spot to build a Dojo. It must be a place where water, fire, and snow meet. But does such a place exist? It's up to you to find out.
In one of the stories, an old abandoned construction site is mentioned. It could possibly be the construction site from Penguin Chat 3.