Fighting Fantasy #2: The Citadel of Chaos by Steve Jackson (author) and Ian Livingstone (author)

Deep inside the Citadel of Chaos, the dread sorcerer Balthus Dire is plotting the downfall of the goodfolk of the Vale of Willow. His battle plans are laid, his awesome army equipped, and attack is surely imminent.

Summoned by a desperate plea for help, YOU are the Vale of Willow’s only hope. 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. Though you command many powerful spells, the quest may be deadly, for who knows what creatures lie in wait in the Citadel of Chaos?