To become a ninja on Club Penguin, you need to play card-jitsu at the dojo again and again to gain more and more experience. To ensure that your experience is increasing, you will be rewarded with different colour belts. When you finally earn the blackbelt (the highest belt), you have to challenge Sensei and beat him in card-jitsu (You'll lose the first time, the second time, but probably will win the 5th time). Once you have done this, Sensei will reward you with a ninja mask. You are now a ninja!
you have to be a member on club penguin to be invisible you have to pay if you have to be a member?
you should become a fire ninja
You become a ninja.
You can't yet.
Go in the ninja hideout, and buy it from the ninja catalog.
1
you cant become sensei but you can be a ninja
You can't yet.
Wait there might be in 2012 snow ninja
No, not really. You can become a master ninja on club penguin, but not a Sensei.
You can become a ninja faster by earning the belts and fighting people more.
it is: ninja there is no code to becoming a ninja on Club Penguin.