all the blue in the world won’t do, without you
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