Crewel Lye (Xanth Book 8)
Golem in the Gears (Xanth Book 9)
Night Mare (Xanth Book 6)
Ogre, Ogre (Xanth Book 5)
Vale of the Vole (Xanth Book 10)
Centaur Aisle (Xanth Book 4)
Heaven Cent (Xanth Book 11)
Castle Roogna (Xanth Book 3)