When you click play now don't in the upper right corner there will be an icon that says unlock items,click on that. Sign in like usual. Click code,and then enter the code,you'll be good to go.
You log into your penguin and then go up to the corner and it will say unlock codes online. Click it and it will take you to the site. There are two buttons: I Have a Book or I Have a Code. Click I...
OK well of course first you have to get a deck of cards. In that deck you will find a card with Sensei on it. In case you don't see that, on the other side it's blue and says Card Jitsu on it so you...
It is the Rockhopper card. It's unbeatable because it is 12 water and if someone plays a snowball card it turns the snowball card to water so the worst it can do is tie/draw.