The way to get the black belt is to :
One:go to the sensei and get the starter deck. You will see people talking about geting an advanced deck of cards but that is for the people who buy the deck of cards at toys r us or any disney stores.
Two:play people till you get your belts.This will take five to ten times. There are three modes you can play in compotion mode, sensei mode,or friendly mode.
White
Yellow
orange
green
blue
red
purple
brown
And finilly BLACK
When you get to the black belt you will face sensei
Four:To beat sensei you wiil have to try about five to ten times it is just like facing friends for your next belt he will mess up then you will attack him an then you will avenchily win and get the ninja mask
Five:You will have akses to the ninja hideout.If you are a member you c
an buy the ninja suit when you get it you can turn in to a shadow by dancing you can also buy : the dojo house the rice paper wall screen the stone lantern and the hand gong.
And that is how to get the black belt and beat sensei
later
P.S . i made a poll for you guys here it is