Thanks Tai, good catch. 16 of the Vampire Castle monsters (Dark Red Porky through Dark Buffy) were drawn from the wrong copy of their art: the soft see-through glow around Dark Buffy had come out as a solid white blob, and the others were slightly off too. All 16 now use the castle's own art. On the empty maps: every castle hunting ground I checked spawns its monsters, and the rooms with none at all (the Staff Chamber, the Guest Room, the Uncertain Places before their boss and the like) are empty in the original castle too. If a hunting room was empty for you, please post its name here and I'll look at that one. The jump quest is the castle's own layout. I haven't changed it, and I'm passing the purpose question on to the owner.