Hell Express

The Hell Express (or Hell Train) is a special examination that any D-rank Regulars can take on the 35th Floor.

About
The Hell Express is an experimental express train that enables passengers to get from the 35th Floor to the 43rd Floor quickly. Due to its extremely high difficulty, it's nearly impossible to survive until the end. Survivors of the Hell Express get to go to the Tower's "Hidden Floor".

The Hell Express departs from the 35th Floor at the first station, "Train City", but also stops at every station from the departing station to the last Floor and Regulars who board the train can get on and off as they please. However to board the train freely, one must have an "Express Ticket"; the Express Ticket cannot be bought and must instead be stolen from another Regular who has one. So, when Regulars are waiting at the boarding stations, one has to steal the Express Ticket from them whilst defending it from other Regulars. There are always exactly 100 Express Tickets and once a Regular has one they become a target to someone else.

There are predators in this train. The highest predators are three and "Sachi Faker" the Ticket Hunter, who is located at the first station, is the one Regulars should be most afraid of.

Notes and Trivia

 * Apparently, the number of D-rank Regulars that hold on to their Express Ticket throughout the entire journey on the Hell Express is less than 5 every year.
 * There is a rumour that the Tower's most beautiful woman is sleeping on the Hidden Floor at the end of Hell Express.
 * Hachuling has been to the Hidden Floor, although he doesn't reveal what's there.
 * When Quant gave the explanation on the Hell Express, he mentioned that it lets you go up 6 Floors. If you catch the train on the 35th Floor, that means you would end up on the 41st Floor and not the 43rd Floor, as Hwa Ryun had explained. SIU mentioned that neither explanation was wrong, with the reason being explained in the future.