TELL me about it. We should have expected it, I suppose; I mean, the game does have the word "labyrinth" in the title.
Hint 2
There are basically four areas: the River of Acheron (with the ferryman and Cerberus), the area with the judges, Tartarus (where the wicked are punished), and the River of Fire. Hey, it's the afterlife, did you expect it to be simple?
Hint 3
Here's a rudimentary map to help you out when you get lost: