Wow, Hitball is actually a good subdungeon now. I really think there should be subdungeon preps now that there is such a variety. Just group them into categories. (i.e. Basic: Monster+Potion or Gold+Potion)
We made an expansion and it is awesome. Really, you should check it out, especially if you're looking for some extra challenge.
Download over at ddmod.weebly.com!