Sideways, always strafe!!!!!
[MENTION=41434]Nazaka[/MENTION]; both the first game, Demon's Souls, and the second, Dark Souls had both castle levels and poison swamp levels. I made it as a bit of a joke, because the castle levels are always (for me anyways) far more fun. I don't know if you have played Demon's Souls, but the castle level in that one (Boletaria) was really fun, while the swamp level (Vally of Defilement) was a special kind of hell.
In Dark souls I would consider the undead burg to be the castle level, as Sen's really is more of a fun-house. Blighttown is still a little annoying, but it is NOTHING AT ALL COMPARED TO DEMON'S SOULS I AM TELLING YOU!!!
You can kind of picture it if you take Blighttown, make the poison maybe 5x as damaging, put the troll guys everywhere, and boost their attack by maybe 10x (think mushroom punches XD). Later there are more powerful versions of these. There is also less ground, and there is no such thing as the rusted iron ring. You also can't roll iirc. There is a version of man-eater Mildred there, but her weapon is basically the most powerful one in the game, and she is very fast, with reasonably large HP.
The only place they made it up was with the bosses, which were easy (the boss of the whole place was really cool and sad, actually... great music too). /vallyofdefilmentrant
ranting or withholding? XD