To become a Ninja in Club Penguin you have to get a black belt in the Card-Jitsu game. To do that you have to keep playing the game and win!
To get the first few belts you have to win a certain number of games before Sensei will award you the next one:
White belt = 3 wins
Yellow belt = 5 wins
Orange belt = 7 wins
Green belt = 9 wins
Blue belt = 11 wins
Red belt = 13 wins
Purple Belt = 15 wins
Brown belt = 16 wins
Black belt = 17 wins
When you have your black belt you have to play against Sensei (click on him and then choose Sensei Mode) – it takes a few goes (keep trying, he gets weaker as you go along) but when you beat him he will give you a special face mask and you will have access to the secret Ninja Room where you can play against other Ninjas:

And you will be able to buy things from the Martial Artworks Catalogue (the Ninja catalogue).
You have to be a member to be able to buy these items:

This is a video that explains Card-Jitsu – click on it and press play to see it!
Enjoy!

it is slake because not everyone can get a black blet i have the yellow and it is hard to get the next one
Well OK. I am a ninja and I want to win the other special cards. How to do it?
IS THAT 11 WINS OR TOTAL WINSON CARD JITSO
GREAT IT’S GONNA TAKE AGES TO BECOME A NINJA FOR ME I’M ONLY BLUE BELT!!!!
Waddle on!
So your saying i have to win 13 times??? dang!
I am a ninja but how do I turn invisable
you said you can only get the costume and the igloo but you can also get a wall screen,a lantern and a hand gong!!!
i got my blk belt and still can get a card off of sensei. How do i win?
im on red belt and i want to know if i have to win 13 times in a reow or just 13 times
Thanks
I Love Club penguin!!!
Hi Chimaloo, you have to win 13 times, but not in a row – I haven’t managed it yet – post a message if you get it!
omg im a black belt and im cool
Does anyone know a cheat to make you a ninja alot faster my boyfriend sean is only a white belt do you know how many wins that is!!!!!
Th link to the full catalouge does not work. To make it work you must takeaway the last ‘/’ and the numbers at the end so that it looks like this in the address bar:
http://media1.clubpenguin.com/play/v2/content/local/en/catalogues/ninja.swf
Theres the real link!
i’ve not been on club penguin for a long time and i have a black belt whoo and im a NINGA
not fair. have to be a member to get the ninja suit
I’m a ninja (black belt) but i can’t buy the outfit because i’m not a member!!! Took me around 5 hours to earn my black belt (on my first day) but it was worth it in the end!!
Waddle on peoples!!
woooo i ninja woot
I’m a Dark blue belt and haven’t updated any of my cards its so easy. Be my buddy.My name is Archipenco. PS:don’t try and guess my password!!!!
cp rock and your site
Hi,Ninja in 30 minutes thanks very much and please visit my youtube channel: Youtube.com/user/Cpbrownhopper,Please Suscribe,Bye!
You have to be a member to buy every thing its so stupid i hate
CLUB PENGUIN IS THE BEST
Why do you have to be a member to buy stuff?!?!