Beating sensei is really hard, you have to be fast. I suggest putting your computer in low resolution mode.
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You do the same in card-jitsu fire
because he is a card jitsu master
a new door will open next year it will be ice or water but in the mean time try to be a fire ninja
Well it doesn't matter how many times you fight him but you can get lucky and win the fight. That's the only legitimate way to beat him.
if you want to defeat sensei you have to try a lot of times then you win because every card you play for example a water card he will play a fire card then you will win.