You have to be a black belt. Play him about 10 times and then you will win.
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just keep playing him if you have your black belt, he will eventually let you win.
You rank up to the black belt and then you verse Sensei. If you win against Sensei you become a ninja! And then you Go to the dojo courtyard and waddle your penguin to the left and click on the door and your penguin will waddle to the secret room! Tada!
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.
Lots of practise is the key to win against Sensei!
You can't 'win' Club Penguin. Club Penguin isn't a 'winning' game. Club Penguin is basically a safe chat room with tooonnnnssss of kids on.