Obvious, you can't. you need a black belt or higher (Fire Card Jitsu) to defeat the sensei.
You beat the sensai
To defeat him you have to earn all the belts by versing other penguins. Talk to the sensei then click earn your belts. When you have the black belt you can defeat the sensai.
To beat the sensei,you have to be a black belt. You constantly have to try again,and again to beat him,because he gets weaker every time you lose.
You go to sensai and beat him to become a ninja!
you must have you're black belt and beat the sensai
on club penguin the most powerfull ninja is sensai
You cannot defeat Club Penguin. However you can beat/complete the missions if you are a secret agent.
You just have to go and fight him in the dojo because he will always use different cards.
its in the dojo in the plant besides sensai. hope it helps guys!
I want to be a member in club penguin.
At the ninja hide out you have to be a member and beat sensai