One of the great things about a megadungeon - and a limited sandbox play area - is that you can keep re-using what you make. Further, you can prep ahead so the game session can take various twists and turns but you're still ready.
Still, Felltower is big, and there are a lot of options in front of the PCs. If I'm to be on top of my game, with the right minis in the box, the right materials reviewed, etc., it's almost essential that I have some idea of what the plan is for the session.
Here is a rough list I provided to the players of what I see is ready to do. I've added to the end with the ones I'd overlooked and one of the players suggested.
- Lord of Spite
- big orichalcum doors
- Various gates
- Lost City of D'Abo (gate destination, I'm double-counting here)
- orc fortress
- door beyond the iron golems
- big chained doors
- mid-point door on the GFS
- gigantic dragon
- five ooze corner
- black reaver
- Saints of Felltower
- Black Library
The PCs added
- Swampsedge, to fight trolls in the area and go back to Sakatha's Tomb
- killing Big John the troll
I left off things I knew weren't really options due to player rejection:
- going back after the beholder
- going after the dragon on the "beholder level"
- going back after the cone-hatted cultists
- exploring further down the second GFS
Some of these just aren't doable for the PCs right now, due to lack of knowledge (the lenses/mirrors and the repulsive door), lack of power (the gigantic dragon), lack of plan (the Black Library), or missing pieces (the tomb of Sakatha - they lack unholy water and have no knowledge of where to get it, and can't make it.)
Obviously I can't prepare for them all. If I load up on all of my ice-and-snow stuff for the Arctic Gate, all of the minis for the cone-hatted cultists, beyond the Joker Gate, the gigantic dragon, the orcs, the oozes, the Air Gate, the draugr, the Lord of Spite, etc. and prep them all . . . when do I work, write, and sleep? I can't have them all ready on a hair-trigger in a high-detail game like GURPS Dungeon Fantasy with lots of tactical options turned to "on." The positive pluses for such a material-heavy gaming approach in actual play does make for more prep and more physical lugging than I can do between every session for every thing.
So we'll see . . . one of the players created a sorted list, but as yet no one has opined on what's next. We'll see what they come up with the night before. Which, incidentally, also leaves me no time to prepare for game. Heh.