The Citadel of Chaos ($3.99), by Worldweaver, continues the game/story line from The Warlock of Firetop Mountain. No internet connection is required to play the game, but it is restricted to US customers.
Book Description
The Citadel of Chaos brings the next installment of the popular game book series Fighting Fantasy by Steve Jackson and Ian Livingstone to Kindle.
A game book is an interactive story. As you read you will make decisions as to which way to go, what to say to other characters, and what to do with items you might find. As a result of your choices you may cleverly solve problems, or even be drawn into battle. Battles are fought by rolling dice and comparing your skill results with those of your foe.
Inside the Citadel of Chaos the dread sorcerer, Balthus Dire, plots the downfall of the good folk of the Vale of Willow. His battle plans are laid, his army equipped, and attack is imminent. As an aspiring wizard, you undertake a mission to strike at the heart of Balthus.
Winning your battles may grant you valuable prizes to help on your quest, but failure... well, the skeletons on the floor have to come from somewhere! A convenient in-game map tracks places you have visited, items, or monsters encountered.
You are the hero! You decide which route to take, which dangers to risk, and which creatures to fight. But be warned - it will also be you who has to live or die by the consequences of your actions.