Portals | Upgrades SR: Gat out of Hell Guide

There are six portals in the Hell, one for each district. You must take control of Marshalling Grounds to be given access to them. Each of those locations will serve you as a portal. Every portal allows you to immediately transport to another one. After teleporting, the character will fall from high altitude, which means you can instantly start flying. Access to the sixth portal, that leads to Satan secret chamber, requires you to get five others.