| Cadzie |
I've actually been running this with PFRPG rules for the last year.
The adventure was written for 3.0 but, for the most part, the monsters can be run as written. You'll want to rewrite any of the classed NPCs, especially the spellcasters. As far as running the adventure itself, I'm using the written material as a skeleton and fleshing it out as the party gets further along. If you're running this from beginning to end as one massive crawl as opposed to a series of connected adventures, it definitely helps to read ahead so you're prepared for how the party might interact with the creatures in the dungeon. Case in point, the party I'm running has left a few bad guys kicking around who've made it into other regions of the dungeon. Those enemies could change the way the adventure plays out if they manage to find weapons or allies to use against the party. And, before I forget, you'll probably want to use the slowest level progression for this since you're players will likely reach level 20 long before they finish otherwise. The group I've got averages level 6 after nearly clearing three regions of the dungeon and they've got 12 regions to go.
If you want them, I could probably post some stat blocks for the NPCs I've used so far.
World's Largest Dungeon was 3.5