tests

At the upper levels of the tower, past the 100th floor, the tests suddenly increase in difficulty again. Unlike the 20th floor, where Regulars often rest for years, too tired to push on, this barrier is called the 'glass ceiling' of the tower. The reason for this is nepotism, (or favoritism, or politics, different people call it different things). In any case, starting from the 100th floor, there are certain floors owned by the 10 Great Families. And naturally, being a part of one of these families might give you a big advantage. Or, for their enemies, these tests become battlegrounds with their lives on the line. The 100th floor belongs to Arie Hon The 111th floor belongs to Khun Eduan

Nezu decided that since it was likely that there is a traitor in the school that he should make it so that the Hero Course is prepared for when the traitor reveals themselves. He does this by setting up a... test of sorts, one that even he doesn't know the answers too. One that he soon realizes, never should have existed in the first place.Midoriya is also an evil genius in this.