Enter The Dojo Talk To Sensei
He will Teach you how to Play Card-Jitsu
Remember Water-fire
fire-snow
snow-water
It takes a certain amount wins to get belts here they are
White belt - 5 total Battles needed.
Yellow belt - 13 total Battles needed.
Orange belt - 21 total Battles needed.
Blue belt - 40 total Battles needed.
Red belt - 52 total Battles needed.
Purple belt - 64 total Battles needed.
Brown belt - 76 total Battles needed.
Black belt - 88 total Battles needed.
After You get a black belt challenge sensei
It'll take a few times to beat him.
After you have beat him you will get access to the ninja hideout Here is the order you get the belts: