The Citadel of Chaos (Wizard series 2 number 2), paperback Fighting Fantasy gamebook, by Steve Jackson
“Deep inside the Citadel of Chaos, the dread sorcerer Balthus Dire is plotting. Summoned by a desperate plea for help, you are the Vale of Willow’s only hope. And you are no ordinary adventurer. As star pupil of the Grand Wizard of Yore and a master sorcerer yourself, you must strike at the very heart of Balthus Dire’s nightmare world.”
The adventure sheet is unused.