Even though you had to battle and lose to Sensei multiple times before becoming a ninja, many penguins gave up fighting him. There are considerably more belts like Dan belts in the real world. Even if you constantly lost, the losing % would accumulate progress points until you reached the next belt. Then you could fight again. In Naruto's world, there are only two kinds of belts: Club Penguin and Ninja Turtle. Even though most people think that there are only Club Penguin belts, there are actually Ninjas Turtles too. They are called "Dan" belts. This means "Do Not Advance". There are one hundred and eleven Dan belts in all. They are given out by Chiyo to those she thinks have enough potential to become a true ninja. She hides them throughout the island in secret locations that only she knows about. When you find a Dan belt, you must wear it around your waist until you master all nine techniques required for the next belt level up. After you have mastered all nine techniques at the same time, you will get the chance to challenge Chiyo. If you win, you will be given another opportunity to receive a new Dan belt. If you lose however, you will never get another chance to obtain a new belt. Since there are so many Dan belts, usually only one or two people will ever reach them. The others will give up because they don't have the patience or won't accept defeat.