Demon Arm

Demon Arm is a solitaire gamebook originally written for the November 2012 24-Hour Design Contest about a quest for freedom and revenge. Huko is a soldier-turned-ronin who is cursed by the sorcerer Kulaki. A demon partially possesses Huko. In the game, you play as Huko, fighting for control over your demon arm as you sneak into Kulaki's fortress to force him to exorcise your demon--or, barring that, to exact your revenge. As you progress through the game, you will be forced to use your demon arm to help you fight, climb, and break into the fortress. Each time you do, the demon can get stronger. If it gets too strong, you could lose your free will and become consumed by the demon. —description from the designer