Get the Firestaff, Upgrade it, kill Lord Chaos.
The dungeon is very similar to the former one: Characters are the same, goal is the same, first level is the HOC...
The end is to me very difficult, the rest is just a bit harder than the original DM.
Some puzzles are inspired from DM & CSB. Don't worry, there is enough new stuff to give you an headache and to make you buddies die a thousand time :-)
Might have problems with the randomly displayed graphics. I am only an unexperimented dungeon designer...