C1533 Challenge rules

But when Lin Tian looked around, he realized that here, the smallest number was room 21, which made him puzzled and asked, "Why aren't there any of the top 20?"

The manager explained, "The top 20 are in the forest ahead. However, if you want to enter this forest, you must first enter the top 100. Then, you must find the person in charge of the training room to register for the top 20