20th Floor

The Twentieth Floor is a keypoint of the Tower, where Regulars may inter the Middle Tower and postpone futher climbing indefinitely, and then restart their testing at any time. Due to a massive increase in difficulty, many Regulars go bankrupt. And they therefore quit for a while and take a break in this time they get a job to earn money to earn the point for futher testing, some also get themselves in trouble with loan sharks by borrowing money to take the test and failing multiple times.

Due to the high difficulty in the tests and small number of regulars whom pass the 20th floor is also known as The neddle hole to heaven, and regulars who pass gets recognized and obtain E-Rank regular status.