Carl and Donut are both on the newly introduced leader board, but like everything else in the dungeon, that comes with a downside. Everyone in the top 10 now has a bounty placed on their head encouraging the other crawlers to take them out via PvP. Of course, the leader board is just another way for the alien corporation running this apocalyptic game show to make money, and various sponsors now vie for the rights to each crawler. Carl and Donut both get sponsored, which opens up the possibility of sponsor and fan provided loot boxes, which they are both going to need. The 4th floor is known as the Iron Tangle, and it was clearly designed to disorient the crawlers. It is a mess of a multi train underground railway system with numerous tracks and junctions that intersect in an unpredictable way. Each group of crawlers arrives on the floor in a train filled with monsters, and more monsters get on and off the train each time it arrives at a new station. It makes you wonder what happens if the train gets to the end of the line?