Geekster3's Awesome Blog of Club Penguin

To be a ninja on CP, you have to:

1.Go to Sensei and when it asks you if you would like to talk to Sensei, click yes.  After that, click earn your belts.  Sensei will then give you your Card-Jitsu starter deck.  This enables you to start playing card-jitsu.

2.Start playing card-jitsu by repeating the first 2 parts of step 1.

3.Once you have earned enough wins, you will earn your first belt: white.  There are several more to earn, but you will have to win more card-jitsu battles to get them.

4.Once you have gotten your black belt, repeat the first part of step 1, but this time click Challenge Sensei.  Challenge Sensei 4-5 times in a row. you should lose those battles.  After that, challenge Sensei again.  This time, he will make lots of mistakes, playing either the wrong kind of card or a lower level of the same element you chose.  Once you win this round, you will have earned your ninja mask and a new room: The Ninja Hideout.  There is a catalog inside the Hideout, in which you can buy the Ninja Suit.  The suit lets you turn invisible by dancing when you wear it and the Ninja mask with nothing else.  You can also buy the Cloud Wave Bracers, they let up a cloud of dust when you wave wearing them, the Ninja suit, and the Ninja mask.  Hope this helped!